-
Yoshinobu Imasaka, Koji Tanaka, Toshio Tanaka
1983 Volume 12 Issue 10 Pages
1477-1480
Published: October 05, 1983
Released on J-STAGE: March 27, 2006
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The N
3− ion can be reduced by [Fe
4S
4L
4]
2−, [Mo
2Fe
6S
8L
9]
3− (L=SCH
2CH
2OH), and [Fe
4S
4(SPh)
4]
2− catalytically under the controlled potential electrolysis conditions in H
2O or in MeOH/THF (1:1 v/v) to give NH
3 and N
2 together with H
2. The formation of N
2H
2 and N
2H
4 was confirmed as intermediates in these reactions.
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Toshifumi Kageyama, Yoshimichi Tobito, Atsushi Katoh, Yoshio Ueno, Mak ...
1983 Volume 12 Issue 10 Pages
1481-1482
Published: October 05, 1983
Released on J-STAGE: March 27, 2006
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α-Bromoketones are prepared in good yields by the reaction of olefins with sodium bromite in aqueous acetic acid at room temperature.
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Masakazu Iwamoto, Hideto Kusano, Shuichi Kagawa
1983 Volume 12 Issue 10 Pages
1483-1486
Published: October 05, 1983
Released on J-STAGE: March 27, 2006
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The anionic hydride HFe
3(CO)
11− species grafted in the zeolite by ionic interaction with an Al
3+ ion showed high catalytic activity for the water gas shift reaction, which was comparable to that of iron carbonyl in homogeneous phase. Kinetic and spectroscopic measurements indicated a reaction of HFe
3(CO)
11− with H
2O as a rate determining step.
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Jun-ichi Onodera, Mltsuru Takano, Yuji Kishi, Noriko Yokoyama, Ryosuke ...
1983 Volume 12 Issue 10 Pages
1487-1488
Published: October 05, 1983
Released on J-STAGE: March 27, 2006
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Acid-catalyzed direct condensation reaction of polyhydric phenols with free glucose in DMSO gave O-α-
D-glucopyranoside in preference to its β-anomer; however, phloroglucinol and phloroacetophenone gave C-β-
D-glucopyranoside instead.
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Kazuhiro Nakasuji, Masakazu Yamaguchi, Ichiro Murata, Kazuyuki Tatsumi ...
1983 Volume 12 Issue 10 Pages
1489-1490
Published: October 05, 1983
Released on J-STAGE: March 27, 2006
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The first neutral η
3-phenalenyl acetylacetonate complex has been synthesized from the reaction of [Pd(phenalenyl)Cl]
2 with thallous acetylacetonate and its structure and electronic properties are discussed.
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Takayuki Suga, Toshifumi Hirata, Hitoshi Okita, Kazunori Tsuji
1983 Volume 12 Issue 10 Pages
1491-1494
Published: October 05, 1983
Released on J-STAGE: March 27, 2006
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As a result of making a direct comparison among the incorporations of the pairs of
14C- and
3H-labeled linalyl, geranyl, and neryl pyrophosphates into α-terpineol and limonene in the cell-free extract of
Mentha spicata and
Citrus natsudaidai, respectively, the linalyl pyrophosphate was found to be the most pivotal, immediate precursor for the cyclization leading to the formation of the cyclic monoterpenoids.
View full abstract
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Yoshihisa Inoue, Mitsuhiro Sakae, Tadao Hakushi
1983 Volume 12 Issue 10 Pages
1495-1498
Published: October 05, 1983
Released on J-STAGE: March 27, 2006
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Direct photolyses at 185 nm of bicyclo[3.2.0]hept-6-ene and bicyclo[4.2.0]oct-7-ene in pentane afforded acetylene and the fragment cycloalkenes as the major photoproducts, whereas the Woodward-Hoffmann allowed ring-opening giving rise to 1,3-diene was a minor process.
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Tadashi Sato, Kazuhiro Watanabe
1983 Volume 12 Issue 10 Pages
1499-1502
Published: October 05, 1983
Released on J-STAGE: March 27, 2006
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The irradiation of amines or enamines with metal complexes of β-diketones in acetonitrile induced a coupling reaction to produce dihydrofuran derivatives.
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Yuji Takikawa, Kazuaki Shimada, Takahiro Makabe, Saburo Takizawa
1983 Volume 12 Issue 10 Pages
1503-1506
Published: October 05, 1983
Released on J-STAGE: March 27, 2006
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2,4,6-Triaryl-dihydro-1,3,5-dithiazines reacted with electrophilic reagents such as p-TsOH·H
2O, CF
3COOH, HCl, and BF
3·OEt
2 under reflux in CH
3CN to afford α-2,4,6-triaryl-1,3,5-trithianes and β-isomers (
3a-d) in good yields. Reactions with I
2 gave selectively
3a-d in high yields, while with ICl or IBr gave
3a-d and p-substituted benzylideneamine·HY.
View full abstract
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Kazuya Kobiro, Yoshihiro Tanaka, Kazuma Okubo, Yasuhiro Hiramatsu, Kiy ...
1983 Volume 12 Issue 10 Pages
1507-1510
Published: October 05, 1983
Released on J-STAGE: March 27, 2006
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Didecalino- and decalino-cyclohexano-18-crown-6, being a new type of cylindrical macrocyclic polyethers, have been synthesized and found to exhibit excellent complexing abilities toward potassium and sodium cations.
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Michiharu Kato, Akihiko Ouchi, Akira Yoshikoshi
1983 Volume 12 Issue 10 Pages
1511-1514
Published: October 05, 1983
Released on J-STAGE: March 27, 2006
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2- (Phenylthio)-2-penten-5-olide, readily accessible from δ-valelolactone, showed high electrophilic reactivities toward some typical carbon nucleophiles to give 3-substituted 2-(phenylthio)pentanolides, which were convertible to a variety of 3-substituted pentan-5-olides and 2-penten-5-olides.
View full abstract
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Kenichiro Mori, Sukeji Suzuki, Kazuo Iguchi, Yasuji Yamada
1983 Volume 12 Issue 10 Pages
1515-1516
Published: October 05, 1983
Released on J-STAGE: March 27, 2006
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Two new cembranolide diterpenes have been isolated from the Japanese soft coral
Sinularia flexibilis. Their structures have been elucidated on the basis of spectroscopic data and chemical transformations.
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Yoshio Okahata, Hiroshi Noguchi
1983 Volume 12 Issue 10 Pages
1517-1520
Published: October 05, 1983
Released on J-STAGE: March 27, 2006
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Permeation of NaCl from the inner aqueous phase of the bilayer-coated capsule membrane was
reversibly regulated by ultrasonic waves. Activation energy data shows that the ultrasonic irradiation makes coating bilayers fluid like a liquid crystalline state and causes the increase of permeation of NaCl.
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Fumio Toda, Koichi Tanaka, Gerardo Ulibarri Daumas, Ma. Cristina Sanch ...
1983 Volume 12 Issue 10 Pages
1521-1524
Published: October 05, 1983
Released on J-STAGE: March 27, 2006
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9,10-Dihydroxy-9,10-diphenyl-9,10-dihydroanthracene, 2,5-diarylhydroquinones, and 9-hydroxy-9-(1-propynyl)fluorene and its 2,7-dihalo-analogs were found to form inclusion complexes with various alcohols. By using the complexation, ethanol was extracted from aqueous solution of various concentration.
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Otohiko Tsuge, Eiji Wada, Shuji Kanemasa
1983 Volume 12 Issue 10 Pages
1525-1528
Published: October 05, 1983
Released on J-STAGE: March 27, 2006
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The stereoselectivity of diene-transmissive Diels–Alder reaction of a cross-conjugated triene, 3-benzylidene-2,4-bis(trimethylsilyloxy)-1,4-pentadiene, with a variety of olefinic dienophiles was investigated. Cyclic dienophiles gave the stereoselective bis-adducts via the endo mono-cycloadducts, whereas the exo mono-adducts were obtained as major products in the reaction with acyclic dienophiles. The steric regulation of diene-transmissive Diels–Alder reaction was discussed.
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Junzo Otera, Yuzuru Kawasaki, Hirofumi Mizuno, Yasumi Shimizu
1983 Volume 12 Issue 10 Pages
1529-1532
Published: October 05, 1983
Released on J-STAGE: March 27, 2006
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Optically active diallylbis(2-phenylbutyl)tin (
1) was successfully obtained by the Grignard method. Enantioselective reaction of
1 with various aldehydes afforded homoallyl alcohols in 20–80% optical yields, which are not affected by solvent effect, but are highly dependent on aldehydes.
View full abstract
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Toshio Sato, Yoshihiko Gotoh, Makoto Watanabe, Tamotsu Fujisawa
1983 Volume 12 Issue 10 Pages
1533-1536
Published: October 05, 1983
Released on J-STAGE: March 27, 2006
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Stereoselective first total synthesis of (4
S)-
trans-β-elemenone was achieved from (
S)-2-cyclohexen-1-ol, prepared easily by the asymmetric reduction of 2-cyclohexen-1-one with chiral hydride reagent.
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Tamotsu Fujisawa, Yoshitsugu Kurita, Toshio Sato
1983 Volume 12 Issue 10 Pages
1537-1540
Published: October 05, 1983
Released on J-STAGE: March 27, 2006
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Ketoximes were synthesized in high yields with a new carbon–carbon bond formation by regioselective nucleophilic attack of Grignard reagents at the α-position of aci-nitroalkanes activated by
N,
N-dimethylchloromethyleniminium chloride in the presence of a catalytic amount of copper(I) iodide under mild conditions.
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Shigemitsu Abe, Tsutomu Nonaka
1983 Volume 12 Issue 10 Pages
1541-1542
Published: October 05, 1983
Released on J-STAGE: March 27, 2006
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Graphite electrodes modified chemically with poly(
L-valine) and poly(
N-acryloyl-
L-valine methyl ester) were prepared. They were remarkably more durable than the corresponding dip-coated electrodes when used repeatedly in the electrochemical asymmetric reduction of citraconic acid.
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Yahia Nabi, Robert Dhal, Eric Brown
1983 Volume 12 Issue 10 Pages
1543-1546
Published: October 05, 1983
Released on J-STAGE: March 27, 2006
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Michael addition of the carbanion of the dithian
7 (derived from
O-benzyl vanillin) on butenolide, afforded the saturated lactone
8. Alkylation of the latter with the benzylic bromide
6, followed by regeneration of the carbonyl group gave the α,β-disubstituted lactone
10. Reduction of the ketonic carbonyl group of compound
10 using NaBH
4, followed by treatment with CF
3CO
2H and catalytic hydrogenolysis afforded (
d,
l)α-conidendrin
1.
View full abstract
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C. A. Fyfe, G. C. Gobbi, W. J. Murphy, R. S. Ozubko, D. A. Slack
1983 Volume 12 Issue 10 Pages
1547-1550
Published: October 05, 1983
Released on J-STAGE: March 27, 2006
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The study of
29Si MAS NMR spectra of zeolites of both low and high Si/Al ratios has provided insight on the factors affecting the residual
29Si line-widths of these materials. It is found that the residual linebroadening in low Si/Al ratio zeolites is due to the distribution of local environments of a particular Si(nAl) type, resulting from the distribution of aluminium atoms in second and further coordination spheres. This is complicated in some cases by a distribution of chemical shifts resulting from crystallographic inequivalence, each of which is subject to the above environmental broadening factors.
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C. A. Fyfe, G. C. Gobbi, G. J. Kennedy
1983 Volume 12 Issue 10 Pages
1551-1554
Published: October 05, 1983
Released on J-STAGE: March 27, 2006
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The dealumination of ZSM-5 by various procedures has been monitored by
29Si and
27Al MAS NMR. The results suggest that ZSM-5 and ‘Silicalite’ are isostructural: Resolved signals from up to 15 crystallographically inequivalent Si tetrahedra are observed in the
29Si spectra of highly dealuminated ZSM-5 materials identical with those observed in the spectra of very highly siliceous ‘Silicalite’ prepared by direct synthesis.
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John M. Thomas, Jacek Klinowski, Michael W. Anderson
1983 Volume 12 Issue 10 Pages
1555-1556
Published: October 05, 1983
Released on J-STAGE: March 27, 2006
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On dealuminating a sample of zeolite ZSM-5 (Si/Al ratio of 33.3 initially, 119 finally) at 540 °C using silicon tetrachloride vapour, the
29Si magic-angle-spinning NMR spectrum develops fine structure akin to that seen in the spectrum of silicalite, while-the
27Al spectrum confirms that Al has been removed from tetrahedral sites. This lends further support to the view that the framework structures of ZSM-5 and silicalite are closely similar.
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Andrzej Jonczyk, Tadeusz Radwan-Pytlewski
1983 Volume 12 Issue 10 Pages
1557-1560
Published: October 05, 1983
Released on J-STAGE: March 27, 2006
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The chlorination of 3-methyl-2-butenyl phenyl sulfone with either hexachloroethane or 1,1-dichloro-3-methyl-2-butenyl phenyl sulfone in basic medium gives rise to 1-chloro-3-methyl-2-butenyl phenyl sulfone which in turn reacts in situ with electrophilic compounds to give a variety of products in good yields.
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Mitsuo Abe, Masamichi Tsuji
1983 Volume 12 Issue 10 Pages
1561-1564
Published: October 05, 1983
Released on J-STAGE: March 27, 2006
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Various antimonates of quadrivalent metals were synthesized by hydrolysis of a mixed solution with antimony(V) chloride solution and a solution of quadrivalent metal salt. The equilibrium distribution coefficients for alkali metal ions on the samples prepared were determined for their selectivities.
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Yukito Murakami, Jun-ichi Kikuchi, Koji Nishida
1983 Volume 12 Issue 10 Pages
1565-1568
Published: October 05, 1983
Released on J-STAGE: March 27, 2006
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The cyclic “face-to-face” bisnicotinamide, cBisNA
+(C
4,
o-Xyl), and its noncyclic counterpart, BisNA
+(Et,
o-Xyl), were readily reduced with the hydroxide ion to afford intramolecular 6,6′-coupling products. The effect of rigid intramolecular geometry on the reactivity was discussed in reference to the similar geometrical effect given by bisdihydronicotinamides on the reduction of a carbonyl substrate.
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Yoshihiro Ozawa, Norio Miura, Noboru Yamazoe, Tetsuro Seiyama
1983 Volume 12 Issue 10 Pages
1569-1572
Published: October 05, 1983
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Antimonic acid was found to exhibit a relatively high proton conductivity at medium temperatures of 100–300 °C in the presence of water vapor. For example, the conductivity as high as 1×10
−4 S·cm
−1 could be maintained for 8 h at 200 °C under the water vapor pressure of 13 kPa. This stable conductivity at medium temperature was found to be attributable to the thermal stability of the water of constitution of Sb
2O
5·2H
2O.
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Norio Miura, Hiroshi Kato, Noboru Yamazoe, Tetsuro Seiyama
1983 Volume 12 Issue 10 Pages
1573-1576
Published: October 05, 1983
Released on J-STAGE: March 27, 2006
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The use of an Ag reference electrode inert to H
2 in air made it possible to fabricate a miniaturized proton conductor sensor element which did not necessitate separation of the sample gas from the reference gas (air). The sensor element was as small as 4 mm (diameter) × 8 mm (length) and showed both high sensitivity and fast response to small amounts of H
2 or CO in air, with satisfactory stability for a period of about one month.
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Naotoshi Nakashima, Reiko Ando, Toyoki Kunitake
1983 Volume 12 Issue 10 Pages
1577-1580
Published: October 05, 1983
Released on J-STAGE: March 27, 2006
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Cast films were prepared on glass from aqueous dispersions of double-chain ammonium amphiphiles. The bilayer characteristics were preserved and specific spectral variations were observed for film-bound cyanine and merocyanine dyes.
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Hideji Itokawa, Hajime Matsumoto, Susumu Mihashi, Yoichi Iitaka
1983 Volume 12 Issue 10 Pages
1581-1582
Published: October 05, 1983
Released on J-STAGE: March 27, 2006
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Two humulene type sesquiterpnoids were isolated from
Torilis scabra D.C. and their structures were determined by X-ray analysis.
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Hiromu Aoyama, Ken-ichi Miyazaki, Masami Sakamoto, Yoshimori Omote
1983 Volume 12 Issue 10 Pages
1583-1586
Published: October 05, 1983
Released on J-STAGE: March 27, 2006
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The photochemical reactions of
N,
N-dialkyl α-oxoamides adsorbed on silica gel were similar to those in acidic methanol, which indicated that the acidity of silanol groups on the surfaces of silica gel played important roles. The photolysis of the amides on alumina resembled those in methanol. The results of the photoreactions also suggested the absence of strong constraint upon the molecular motions of the amides adsorbed on these adsorbents.
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T. Ken Miyamoto, Seizi Tsuzuki, Tai Hasegawa, Yukiyoshi Sasaki
1983 Volume 12 Issue 10 Pages
1587-1588
Published: October 05, 1983
Released on J-STAGE: March 27, 2006
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Stable hydroxy iron (III) complexes have been prepared in the use of bulky porphyrins, e.g.,
meso-tetrakis(3,5-di-
t-butylphenyl)porphyrin(Abbr. TBPP-H
2) and
meso-tetrakis(3,5-di-
t-butyl-2-nitrophenyl)porphyrin(TBNPP-H
2, 4 isomers). The stability of these complexes is rationalized as steric effect due to the t-butyl and/ or nitro groups.
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Tadashi Sato, Kazuo Takahashi, Shuji Ichikawa
1983 Volume 12 Issue 10 Pages
1589-1592
Published: October 05, 1983
Released on J-STAGE: March 27, 2006
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Photoreaction of
D-glucose and
D-galactose in methanol in the presence of titanium(IV) chloride induced a selective bond cleavage at the C5–C6 position, and produced pentodialdose derivatives.
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Seiichi Takano, Masashi Akiyama, Seiji Sato, Kunio Ogasawara
1983 Volume 12 Issue 10 Pages
1593-1596
Published: October 05, 1983
Released on J-STAGE: March 27, 2006
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Benzylidene acetals of 1,2- and 1,3-glycols are easily cleft by diisobutylaluminum hydride in a toluene solution at 0 °C–room temperature to give the corresponding monobenzyl ethers of the glycols. In general the reaction proceeds excellently in regioselective manner depending on the stereochemical environment.
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Akiko Kume, Mitsuo Sekine, Tsujiaki Hata
1983 Volume 12 Issue 10 Pages
1597-1600
Published: October 05, 1983
Released on J-STAGE: March 27, 2006
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Introduction of a long alkyl chain between the nucleoside and the silica gel support was effective in DNA synthesis via the phosphotriester method. dApApApA containing 3′-terminal deoxyadenosine was successfully synthesized on the support by using
N6-phthaloyldeoxyadenosine.
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Yukio Masaki, Yuzuru Serizawa, Kinnosuke Nagata, Kenji Kaji
1983 Volume 12 Issue 10 Pages
1601-1602
Published: October 05, 1983
Released on J-STAGE: March 27, 2006
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(+)-(
S,
S)-(
cis-6-Methyltetrahydropyran-2-yl)acetic acid, a constituent of the glandular secretion from the civet cat was synthesized enantiospecifically from (+)-(
R,
R)-diethyl tartrate via stereospecific reductive ring opening of an optically active 5,7-disubstituted 6,8-dioxabicyclo[3.2.1]octane derivative.
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Ryu Sato, Nobushige Saito, Minoru Saito
1983 Volume 12 Issue 10 Pages
1603-1606
Published: October 05, 1983
Released on J-STAGE: March 27, 2006
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Sulfimides and sulfodiimides were readily deiminated with elemental sulfur catalyzed or uncatalyzed by amines affording corresponding sulfides and its derivatives under mild conditions in excellent yields.
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Alfredo Ortega, Alfonso Romo De Vivar, Rubén A. Toscano, Emma M ...
1983 Volume 12 Issue 10 Pages
1607-1610
Published: October 05, 1983
Released on J-STAGE: March 27, 2006
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A study of
Zinnia peruviana afforded the new elemanolides zinaflorin IV and zinaflorin V. An X-ray crystallographic analysis of zinaflorin IV established its structure and stereochemistry as belonging to the rather unusual group of C
14α, H
5β elemanolides.
The generic name zinnolides is proposed for the elemanolides possessing the same relative configuration around the six member ring as that of zinaflorin IV.
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Yasuo Deguchi, Keiichi Okada, Jim Yamauchi, Kanae Fujii
1983 Volume 12 Issue 10 Pages
1611-1614
Published: October 05, 1983
Released on J-STAGE: March 27, 2006
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General triple resonance spectra of diphenyl nitroxide have been observed in ethylbenzene at −90 °C by means of the ENDOR spectrometer with a TM
110 mode cavity. The signal intensity was greatly influenced by the pumping frequency set on each of the ENDOR lines. The results indicate that two hyperfine couplings of the meta and para or ortho positions have opposite signs.
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Yoshinori Nagase, Hideshi Hattori, Kozo Tanabe
1983 Volume 12 Issue 10 Pages
1615-1618
Published: October 05, 1983
Released on J-STAGE: March 27, 2006
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A Raney-type silver-zinc (1:1 wt. ratio) catalyst was found to exhibit a high activity and selectivity for the hydrogenation of acrolein to allyl alcohol, 70% conversion and 90% selectivity being observed in 90 min at 120 °C. Addition of small amount of Fe
3+ to the catalyst resulted in an increase in the selectivity to 95% with a slight decrease in activity.
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Kimio Kunimori, Hiroshi Abe, Toshio Uchijima
1983 Volume 12 Issue 10 Pages
1619-1622
Published: October 05, 1983
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In contrast to the case of the TiO
2-supported systems, the activities of CO hydrogenation on Rh/Nb
2O
5 catalysts in the SMSI state were two orders of magnitude lower than in the normal state. The product selectivity appeared to be similar between the normal and SMSI states, but to depend on the metal particle size.
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Michiko Iwamura, Shohaku Futibe, Tetuo Matukura, Masahide Sano
1983 Volume 12 Issue 10 Pages
1623-1626
Published: October 05, 1983
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Dibenzylmercury was completely decomposed within 20 min in refluxing xylene in the presence of a catalytic amount of 5% palladium on carbon, giving mercury and dibenzyl. The generation of benzyl radicals was confirmed by the formation of 1,3-adduct to α-phenyl-
N-benzylnitrone and 9,10-adduct to anthracene. Other alkylmercurials showed a similar but less satisfactory result.
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Nobuyasu Enoki, Kazuo Tsuzuki, Satoshi Omura, Ryoichi Ishida, Takeshi ...
1983 Volume 12 Issue 10 Pages
1627-1630
Published: October 05, 1983
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The methanol extract of the brown seaweed
Dictyota dichotoma inhibited the growth of microbes. Three active constituents were found to be diterpene alcohols having the hydroazulene skeleton.
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Ken’ichi Takeuchi, Tetsuo Toyama, Yasuhiro Kubota, Kunio Okamoto
1983 Volume 12 Issue 10 Pages
1631-1634
Published: October 05, 1983
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Correlated rotation of the cycloalkyl groups has been observed by
13C NMR for the title compounds containing six-, seven-, or eight-membered rings. The ΔH
≠ value increases with the increase in the ring size, attaining 79.5 ± 2.1 kJ mol
−1 when all the three rings are eight-membered. Molecular mechanics calculations indicated that the magnitude of internal angles is a major contributing factor.
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Akihiko Ueno, Yoko Tomita, Tetsuo Osa
1983 Volume 12 Issue 10 Pages
1635-1638
Published: October 05, 1983
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γ-Cyclodextrin appended by a naphthalene moiety forms an excimer with naphthalene in its cavity. The addition of 1-borneol causes a decrease in the excimer emission as a result of replacement of the included naphthalene by 1-borneol.
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Teruaki Suzuki, Kuniko Koizumi, Minoru Suzuki, Etsuro Kurosawa
1983 Volume 12 Issue 10 Pages
1639-1642
Published: October 05, 1983
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Kumausallene, a new C
15-bromoallene has been isolated from the title alga, and its structure was established on the basis of the spectral properties and chemical degradation.
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Teruaki Suzuki, Kuniko Koizumi, Minoru Suzuki, Etsuro Kurosawa
1983 Volume 12 Issue 10 Pages
1643-1644
Published: October 05, 1983
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Four new halogenated C
15-nonterpenoids which are unusual oxolane derivatives have been isolated from the red alga
L. nipponica Yamada, and their structures were determined by spectral and chemical evidence.
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Yoshito Tobe, Ken-ichi Ueda, Kiyomi Kakiuchi, Yoshinobu Odaira
1983 Volume 12 Issue 10 Pages
1645-1646
Published: October 05, 1983
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[6]paracyclophane (
1) has been synthesized by oxidative decarboxylation of [6.2.2]propellenecarboxylic acid with lead tetraacetate. Vapor phase thermolysis of
1 affords 3-methylene-spiro[5.5]undeca-1,4-diene predominantly, while acid-catalyzed rearrangement of
1 gives the meta and ortho isomers in a ratio of 1:3.
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Teiji Chihara, Erika Waniguchi, Tamie Wakabayashi, Kazuo Taya
1983 Volume 12 Issue 10 Pages
1647-1648
Published: October 05, 1983
Released on J-STAGE: March 27, 2006
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The Girard’s reagent, which gives water-soluble derivatives of carbonyl compounds, was used together with silica gel as a protective reagent of them in a non-aqueous solvent system. Less hindered or more reactive carbonyl compounds were selectively protected by this method in competitive reductions.
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Yusuke Izumi, Satoshi Sato, Kazuo Urabe
1983 Volume 12 Issue 10 Pages
1649-1652
Published: October 05, 1983
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The boron trioxide coupled with hydroxyapatite was found to catalyze the Beckmann rearrangement of cyclohexanone oxime in the vapor phase at 300 °C more selectively than boria-alumina and silica-alumina. The basic property of hydroxyapatite appears to play an important role in effecting the rearrangement selectively.
View full abstract
