-
Gin-ya Adachi, Kuniaki Murase, Kiyoshi Shinozaki, Ken-ichi Machida
1992 Volume 21 Issue 4 Pages
511-514
Published: 1992
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Mutual separation characteristics of lanthanoid chlorides LnCl
3 (Ln = Pr, Nd) using a chemical vapor transporting method via gaseous complexes were investigated. Compared with AlCl
3 as the transporting agent, alkaline chlorides can transport more amounts of LnCl
3, and enhance the separation efficiency between PrCl
3 and NdCl
3.
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Kenkichiro Kobayashi, Shigenori Matsushima, Genji Okada
1992 Volume 21 Issue 4 Pages
515-518
Published: 1992
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We propose a new principle of an optical memory using photoionization of transition-metal ions doped into an oxide which is kept in strong electric field. Several conditions required to realize an optical memory are present.
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Shouji Iwatsuki, Masataka Kubo, Makoto Ohtake
1992 Volume 21 Issue 4 Pages
519-522
Published: 1992
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A new solid composite of poly(N-vinylacetamide), lithium trifluoromethanesulfonate, and poly(ethylene glycol) was prepared and characterized as a polymer electrolyte with high conductivity.
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Katsumi Tokumaru
1992 Volume 21 Issue 4 Pages
523-526
Published: 1992
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The mechanism for reactions of diaroyl peroxides with I
− commonly utilized for their determination is reexamined in terms of single electron transfer (SET) theory and is regarded not as an SET mechanism as has been supposed but an S
N2 mechanism.
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Shuji Usui, Takeharu Haino, Tatsuhiko Hayashibara, Yoshimasa Hirai, Yo ...
1992 Volume 21 Issue 4 Pages
527-530
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Medium ring compounds (9 to 11 membered rings) having endo (E or Z) and exo double bonds at 1,5-positions were synthesized by intramolecular cyclization of the ω-functionalyzed allylic anion stabilized by a sulfur atom. The yields of cyclization were related not only with the cyclization enthalpy (steric strain of the resultant cyclic compounds) but also with entropy factor.
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Hideo Sawada, Yue-Fa Gong, Takeo Matsumoto, Masanori Kosugi, Toshihiko ...
1992 Volume 21 Issue 4 Pages
531-534
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New perfluoro-oxa-alkylated oligomers were obtained by the reactions of methacrylate monomers with perfluoro-oxa-alkanoyl peroxides under very mild conditions, and the perfluoro-oxa-alkylated oligomers containing hydroxyl ethylene oxide units were found to indicate surface properties typical of the amphipathic compounds.
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Ken Takaki, Fumikazu Beppu, Ikuko Nakagawa, Yuzo Fujiwara
1992 Volume 21 Issue 4 Pages
535-538
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Ytterbium metal promoted reaction of chalcone with equimolar amount of benzaldehyde gave 2-benzoyl-5-phenylhydroxymethyl-1,3,4-triphenylcyclopentanol, whereas 2,5-bis(benzoyl)cyclopentanol was obtained by the reaction with excess amount of the aldehyde. In addition, similar reaction of 3-anisyl-1-phenyl-2-propen-1-one with anisaldehyde afforded 2:2 adduct, 5-[anisyl(anisylmethoxy)methyl]cyclopentanol, irrespective of amount of the aldehyde.
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Koji Araki, Hiroto Murakami, Fumio Ohseto, Seiji Shinkai
1992 Volume 21 Issue 4 Pages
539-542
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pK
a Values and activation parameters for ring inversion of 25,27-diamino-5,11,17,23-tetra-t-butylcalix[4]arene-26,28-diol were estimated. It was found that in the OH groups of this compound the “super-acidic” proton, observed for conventional calix[4]arene-25,26,27,28-tetrols, no longer exists and ring inversion occurs more easily.
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Shigeo Yamamura, Takashi Tamaki, Takahiro Seki, Masako Sakuragi, Yuji ...
1992 Volume 21 Issue 4 Pages
543-546
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The nematic director alignment in the liquid crystal cell was reversibly regulated by geometrical isomerization of α-hydrazono-β-keto ester derivatives directly linked on the substrate surface. The reversible change in the shape of the photochromic molecules may be responsible for regulating the alignment of the nematic liquid crystals.
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Yoshiharu Okada, Toru Minami, Tsutomu Yamamoto, Junji Ichikawa
1992 Volume 21 Issue 4 Pages
547-550
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Optically active trans-2,3-bis(diphenylphosphino)-1-methyl-1-cyclopropanecarboxylic acid was synthesized from trans-1,2-bis(diphenylphosphinyl)ethene
via resolution of the racemic diphosphine oxide. Asymmetric allylic alkylation of 2-cyclohexenyl acetate with
l-menthyl sodiodiethylphosphonoacetate was achieved in good optical yields by the use of its palladium complex.
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Seiji Takeuchi, Norikazu Miyoshi, Yoshiaki Ohgo
1992 Volume 21 Issue 4 Pages
551-554
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SmI
2-mediated allylation or benzylation of alkylarylketenes followed by enantioselective protonation with α,α′-di[(S)-2-hydroxy-2-phenylethyl]-o-xylenedioxide gave the corresponding ketones in 61–91%ee.
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Mitsuo Kira, Takakazu Hino, Hideki Sakurai
1992 Volume 21 Issue 4 Pages
555-558
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The intermediacy of trialkylsiloxycarbenium ions was demonstrated by NMR spectroscopy during the reduction of ketones with hydrosilanes catalyzed by trityl tetrakis[3,5-bis(trifluoromethyl)phenyl]borate. It is suggested that the non-nucleophilic nature of the counter anion plays an important part in the modification of the reaction courses.
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Takaya Matsumoto, Kazuko Matsumoto
1992 Volume 21 Issue 4 Pages
559-562
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A diruthenium compound with a novel Ru
2(S
2)Cl
2 core has been synthesized. The X-ray crystal study shows that the disulfide ligand bridges the ruthenium atoms in a cis manner with the S-S distance of 1.971(4) Å. The compound has a redox potential of −0.57 V (vs. Ag
+/Ag) and a characteristic absorption band at 737 nm.
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Jun Wang, Masahiro Tsuchiya, Toshiyuki Tateno, Hirochika Sakuragi, Kat ...
1992 Volume 21 Issue 4 Pages
563-564
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Transient absorption spectroscopy of laser excitation of bis(2-methylbenzoyl) peroxide has revealed that the resulting 2-methylbenzoyloxyl radical undergoes intramolecular hydrogen atom transfer from the neighboring 2-methyl group to give a 2-carboxybenzyl radical with a rate const of 10
7 s
−1 at room temperature in acetonitrile with an activation energy of 4 kcal mol
−1 and a frequency factor of 10
10.5 s
−1.
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Teiji Kato, Hideyuki Akiyama, Masaaki Yoshida
1992 Volume 21 Issue 4 Pages
565-566
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A-T isobars of octadecylurea monolayers were measured. This is the first direct observation that the monolayers exhibited a first-order phase transition accompanying discontinuous molecular area contraction with increasing temperature. This may be due to the “fusion” of a hydrogen bonded bulky structure of urea head groups in the monolayers at the water surface.
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Tetsuya Ikemoto, Keiichi Sakashita, Yoshitaka Kageyama, Fumiko Terada, ...
1992 Volume 21 Issue 4 Pages
567-570
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(
S)-2-(4′-
n-Decyloxybiphenyl-4-carboxy)-4,4-dialkyl-γ-butyrolactones were synthesized and shown to be good chiral dopants for ferroelectric liquid crystals.
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Hideyuki Kuno, Makoto Shibagaki, Kyoko Takahashi, Ichiro Honda, Hajime ...
1992 Volume 21 Issue 4 Pages
571-574
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The lactonization of ω-hydroxy esters was carried out by catalysis with hydrous zirconium(IV) oxide. In the flow reaction system, ω-hydroxy esters were efficiently converted to give the corresponding lactones. In particular, it is noteworthy that heptanolide is obtained in good yield. In addition, it is possible to produce a large quantity of lactones in this catalyst system.
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Norio Tanaka, Masataka Hatanaka, Yoshihisa Watanabe
1992 Volume 21 Issue 4 Pages
575-578
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Azoles containing acidic NH-group react with various alcohols in the presence of catalytic amount of ruthenium-, rhodium-, and iridium- trialkylphosphite complexes to give the corresponding N-alkylated azoles in good to excellent yields.
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Akihiko Tsuge, Tetsuji Moriguchi, Shuntaro Mataka, Masashi Tashiro
1992 Volume 21 Issue 4 Pages
579-582
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[2.2]Metacyclophanes(=MCPs) which carry hydroxy, methoxy or methyl group at the inner position exhibited a stronger reactivity toward diazonium salts than the corresponding phenol, anisole or toluene, respectively. Such a reactivity was also estimated in connection with the UV spectra of the azo benzene component.
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Takaki Kanbara, Takashi Kushida, Nobuo Saito, Isao Kuwajima, Kenji Kub ...
1992 Volume 21 Issue 4 Pages
583-586
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Reaction of 2,5-dibromopyrimidine with a zero-valent nickel complex affords poly(pyrimidine-2,5-diyl). This new polymer is easily converted into electrical conducting materials by chemical and electrochemical reductions, the latter reduction occurring at the highest potential (−1.75 V
vs. Ag/Ag
+) among reported π-conjugated polymers.
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Sheng Yao, Youichi Shimizu, Norio Miura, Noboru Yamazoe
1992 Volume 21 Issue 4 Pages
587-590
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An Na
+-conductor (NASICON)-based solid electrolyte device fitted with an NaNO
2 auxiliary electrode showed excellent sensing characteristics to NO and NO
2 in air. The electromotive force, EMF, followed the Nernst’s equation for 1–800 ppm NO and 0.1–200 ppm NO
2 at temperatures of 150–240 °C, the Nernst’s slopes indicating one-electron reduction for both gases.
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Yonezo Maeda, Yuichi Tanigawa, Shinya Hayami, Yoshimasa Takashima
1992 Volume 21 Issue 4 Pages
591-594
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Diiron(II)-(III) complexes [Fe
2L(pa)
2](ClO
4)
2 and [Fe
2L(mpdp)](ClO
4)
2 were prepared, where HL represents 2,6-bis[bis(2-pyridylmethyl)aminomethyl]-4-methylphenol, Hpa is pelargonic acid and H
2mpdp is m-phenylenedipropionic acid. The valences of the irons are localized at low temperature, and delocalized in the Mössbauer time scale (1 × 10
−7s) above 265 K for both of the complexes.
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Yoshihito Ueno, Tamako Mishima, Hitoshi Hotoda, Tsujiaki Hata
1992 Volume 21 Issue 4 Pages
595-598
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A general route to the synthesis of the 2′(3′)-O-aminoacyl CpA using the 1-ethoxyethyl group for tentative protection of the 2′-hydroxyl group of adenosine, is described.
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Hidenori Chikashita, Takashi Fukushima, Hiromitsu Uemura, Kazuyoshi It ...
1992 Volume 21 Issue 4 Pages
599-602
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Reduction of dithioacetal-functionalized cyclic hemiketals with LiAlH
4 in THF and NaBH
4 in ethanol gave the corresponding
anti- and
syn-1,4-diols with excellent Stereoselectivity, respectively. The
anti- and
syn-1,4-diols were easily transformed into
trans- and
cis-2,5-disubstituted tetrahydrofurans with complete stereospecificity by the one-step cyclodehydration with
p-TsCl in pyridine, respectively.
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Kye Kwang Kim, Jae Nyoung Kim, Kyoung Mahn Kim, Hyoung Rae Kim, Eung K ...
1992 Volume 21 Issue 4 Pages
603-604
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The reaction of alkynes with N,N-dimethylformamide (DMF)/HCl/potassium monoperoxysulfate (Oxone, Aldrich) afforded the corresponding α,α-dichloroketones in good yields.
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Hiroyuki Ishida, Kentaro Takagi, Ryuichi Ikeda
1992 Volume 21 Issue 4 Pages
605-608
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Three solid phases of (CH
3)
2NNH
3BF
4 were found between 200 K and the melting point (415 K) by differential thermal analysis, differential scanning calorimetry, and
1H and
19F NMR measurements. The highest-temperature solid phase obtainable above 268 K was shown to be an ionic plastic phase, where the cations as well as the anions perform rapid translational self-diffusion and overall rotation about their center of gravity.
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Bernd Wermeckes, Siyu Ye, Fritz Beck
1992 Volume 21 Issue 4 Pages
609-612
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1,3-cyclohexanedione can be electrochemically oxidized in aqueous sulfuric acid at platinum to the 1,2,3-cyclohexanetrione. Yields of about 76% and current efficiencies up to 54% were found.
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Roger Brettle, David A. Dunmur, Charles M. Marson, Milagros Piñ ...
1992 Volume 21 Issue 4 Pages
613-616
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A homologous series of 2-alkyl-5-(4′-cyanophenyl)thiophenes has been prepared and shown to have improved properties for use in liquid crystal displays. The thiophene ring is prepared from a 1-(4′-bromophenyl)-1,4-dioxoalkane, constructed using the Stetter procedure, by the action of Lawesson’s reagent, and the cyano-group is finally introduced using a copper(I)-mediated exchange reaction.
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Takashi Sumiyoshi, Hiromichi Sakai, Masahiro Kawasaki, Meiseki Katayam ...
1992 Volume 21 Issue 4 Pages
617-620
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The combined pulse radiolysis-laser flash photolysis method has established that the excited state of diphenyl sulfide/chlorine atom complexes readily undergoes intermolecular hydrogen abstraction, while the excited state of diphenyl sulfide/bromine complexes is de-excited without any reactions.
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Shunzo Yamamoto, Toshiro Nagaoka, Yoshimi Sueishi, Norio Nishimura
1992 Volume 21 Issue 4 Pages
621-624
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The Hg(
3P
1)-photosensitized luminescence of amine(AM)-ethanol(AL) mixtures was studied under the condition of steady illumination. The intensity of luminescence from an HgAL
* complex decreased with increasing amine pressure, while the emission intensity from an HgAM
* complex increased on addition of AL. We propose that the ligand exchange reaction, HgAL
* + AM → HgAM
* + AL, is involved in this system.
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Teruaki Mukaiyama, Isamu Shiina, Mitsutomo Miyashita
1992 Volume 21 Issue 4 Pages
625-628
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Various carboxylic esters are prepared in excellent yields by the reaction of nearly equimolar amounts of silyl derivatives of carboxylic acids and alcohols with p-trifluoromethylbenzoic anhydride in the presence of a catalytic amount of Lewis acid.
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Tadashi Hattori, Syoichi Yamauchi, Atsushi Satsuma, Yuichi Murakami
1992 Volume 21 Issue 4 Pages
629-630
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CO
2 was successfully reduced on a Zn/HZSM-5 catalyst accompanying the conversion of C
3H
8 into more valuable products. Further, CO
2 was found to suppress the formation of lower alkanes and the deposition of coke.
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Atsunori Mori, Hiroshi Ohno, Shohei Inoue
1992 Volume 21 Issue 4 Pages
631-634
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A novel character of a simple organoaluminum compound, dimethylaluminum chloride, concerning molecular recognition is demonstrated by the crossover reaction of aliphatic and aromatic aldehydes (benzaldehyde and cyclohexanecarbaldehyde) with organosilicon reagents, ketene trimethylsilylacetal and cyanotrimethylsilane in the presence of dimethylaluminum chloride (20–50 mol%) to afford the corresponding aldol adduct of benzaldehyde and cyanohydrin of cyclohexanecarbaldehyde exclusively.
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Yongtie Yan, Youichi Shimizu, Norio Miura, Noboru Yamazoe
1992 Volume 21 Issue 4 Pages
635-638
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Electrochemical cells using MgO-stabilized zirconia tube coated with metal sulphates were found to exhibit fairly good sensing properties to 20–200 ppm SO
2 in air at 650–800 °C. With various sulphates such as Li
2SO
4 and Na
2SO
4, EMF responses to SO
2 followed Nernst’s equations for a 2-electron reduction of SO
2. With Li
2SO
4-CaSO
4 (6:4 in molar ratio), 90% response- and 90% recovery-times were 12 s and 2.5 min, respectively, for 130 ppm SO
2 at 800 °C.
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Tomoki Maekawa, Jun Tamaki, Norio Miura, Noboru Yamazoe
1992 Volume 21 Issue 4 Pages
639-642
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Among various noble-metal loaded WO
3 sensor elements, the one loaded with Au showed the best NH
3 sensing performance in sensitivity and response rate at 450 °C. It could detect NH
3 in air over a wide concentration range from 5 ppb to 50 ppm. The optimum Au loading was 0.8 wt%.
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Tsukasa Maruyama, Zhen-hua Zhou, Kenji Kubota, Takakazu Yamamoto
1992 Volume 21 Issue 4 Pages
643-646
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A series of poly(methylpyridine-2,5-diyl)s were synthesized by dehalogenation polycondensation of the corresponding 2,5-dibromo-methylpyridine with zerovalent nickel complexes. The polymers had molecular weight much higher than that of poly(pyridine-2,5-diyl). Poly(methylpyridine-2,5-diyl)s were converted into semiconducting material by chemical and electrochemical reduction (n-type doping).
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Teruyuki Hayashi, Yuko Uchimaru, N. Prabhakar Reddy, Masato Tanaka
1992 Volume 21 Issue 4 Pages
647-650
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Poly[{(
E)-1,1,2,2-tetramethyldigermanylene}ethenylene], poly[(1,1,2,2-tetramethyldigermanylene)-2,5-thienylene], poly[(1,2-dimethyl-1,2-diphenyldigermanylene)-
p-phenylene], and poly(methylphenylgermylene) were synthesized. SbF
5 doping of above polymers showed the conductivities of the order of 10
−4 S/cm, which were similar to, or a little higher than, those of corresponding silicon analogues.
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Shojiro Maki, Seiji Kosemura, Shosuke Yamamura, Shigeki Kawano, Shiger ...
1992 Volume 21 Issue 4 Pages
651-654
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9-Methoxy-6β-(3′,4′-dimethoxyphenyl)-2β,5α-dimethyltricyclo[5.4.0.0
1,5]undec-9-en-8,11-dione has been synthesized by using electrochemical oxidation of the corresponding phenol and then readily converted into a triquinane-type compound in 8 steps.
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Shin-ichiro Watanabe, Nobujiro Shimizu, Yuho Tsuno
1992 Volume 21 Issue 4 Pages
655-656
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Pyrolysis of 1-aryl-2-(trimethylsilyl)ethyl acetates, X-C
6H
4CH(OCOR)CH
2SiMe
3 (X = m-Cl, H, p-Me, and p-MeO; R = CH
3 and CF
3), takes two distinct elimination pathways in varying ratios depending on solvent polarity, electron-supply from aryl groups, and nucleofugality of leaving groups.
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Naoyuki Watanabe, Takeshi Sugai, Hiromichi Ohta
1992 Volume 21 Issue 4 Pages
657-660
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Several kinds of enzymes catalyzed the enantioselective hydrolysis of 2-substituted glycerol 1,3-diacetates to afford optically active monoacetates of 50–73%e.e. under ordinary conditions (phosphate buffer, pH 7, 30 °C). After examining the effect of co-solvents, the hydrolysis of 2-trimethylsilylethoxymethoxyglycerol 1,3-diacetate using lipase LP was improved to afford the monoacetate of 87%e.e. with definite absolute configuration in 50% aqueous DMF at 3 °C.
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Naoyuki Watanabe, Hiromichi Ohta
1992 Volume 21 Issue 4 Pages
661-664
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A key-intermediate of synthetic anthracycline, (+)-(1
S,2
S)-1,3-dihydroxy-3,3′-O-isopropiridene-3-(hydroxymethyl)-5,8-dimethoxy-1,2,3,4-tetrahydronaphthalene was synthesized from optically active 2-substituted glycerol monoacetate which was prepared via enantioselective enzymatic hydrolysis of a prochiral 2-substituted glycerol derivative.
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Norikazu Nishino, Takanobu Shiroishi, Taito Muraoka, Tsutomu Fujimoto
1992 Volume 21 Issue 4 Pages
665-668
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The cyclic hexapeptides containing artificial and lipophilic amino acid, α-aminomyristic acid were designed. The poly(vinyl chloride) (PVC) membrane electrode based on a cyclic hexapeptide exhibited high calcium ion selectivity over sodium and potassium ions.
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Atsushi Ishihara, Haruhiko Tajima, Toshiaki Kabe
1992 Volume 21 Issue 4 Pages
669-670
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Hydrodesulfurization of polyaromatic sulfur-containing compounds in light oil was carried out by using Co-Mo/Al
2O
3 under experimental conditions representative of industrial practice. Alkyl-substituted dibenzothiophenes in light oil, especially 4,6-dimethyldibenzothiophene, were difficult to desulfurize even under deep desulfurization conditions.
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Yasuyuki Sakata, Yuji Katayama, Yasutaka Ishii
1992 Volume 21 Issue 4 Pages
671-674
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Aliphatic olefins were directly converted into α-hydroxy ketones with acidic aqueous hydrogen peroxide in the presence of catalytic amount of peroxotungstophosphate (PCWP) under the biphasic system using chloroform as a solvent. The acidic medium was necessary to open the resulting epoxide to
vic-diol which was subsequently oxidized to α-hydroxy ketones.
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Naomichi Furukawa, Yasuhiro Ishikawa, Takeshi Kimura, Satoshi Ogawa
1992 Volume 21 Issue 4 Pages
675-678
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Sterically congested 1,9-bis(phenylthio)dibenzoselenophene (
4a) and 1,9-bis(phenylseleno)dibenzoselenophene (
4b) were prepared. New dithia dication and diselena dication were generated from
4a and
4b, respectively, in coned sulfuric acid.
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Atsushi Miyabo, Toshikazu Kitagawa, Ken’ichi Takeuchi
1992 Volume 21 Issue 4 Pages
679-682
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The standard free energies of heterolysis (Δ
G°
het) of a carbon–carbon σ bond in sterically congested hydrocarbons
R1–
R2b–j and a related derivative
R1–
R2a in DMSO and sulfolane at 25 °C are about 40 kJ/mol smaller than expected from Arnett’s master equations, indicating the importance of steric factor in the heterolytic cleavage.
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Atsushi Miyabo, Ken’ichi Takeuchi, Koichi Komatsu, Toshikazu Kit ...
1992 Volume 21 Issue 4 Pages
683-686
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The reaction of sterically comparable cations, 3-(
p-methylphenyl)- and 3-phenyl-1,2-dicyclopropylcyclopropenylium ions with highly stable Kuhn’s anion (C
67H
39−) gives a hydrocarbon salt and a covalent hydrocarbon, respectively, suggesting that a slight difference in cation stability differentiates the formation of either product.
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Noritaka Chida, Ken Yamada, Seiichiro Ogawa
1992 Volume 21 Issue 4 Pages
687-690
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The stereoselective conversion of naturally occurring optically active cyclitol,
L-quebrachitol (
2), into antifungal (
E)-β-methoxyacrylate, oudemansin X is described. This synthesis fully confirmed the proposed absolute configuration of the antibiotic and revealed the usefulness of
2 as a versatile chiral pool.
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Tatsuo Ishiyama, Shigeru Abe, Norio Miyaura, Akira Suzuki
1992 Volume 21 Issue 4 Pages
691-694
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9-Alkyl-9-BBN derivatives undergo the cross-coupling reaction with primary iodoalkanes to give the coupling products in fairly good yields in the presence of a catalytic amount of Pd(PPh
3)
4 and K
3PO
4.
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Hiroaki Fujishima, Ei-ichi Takada, Shoji Kara, Akira Suzuki
1992 Volume 21 Issue 4 Pages
695-698
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In the presence of BF
3 etherate, (1-alkynyl)diisopropoxyboranes react with α,β-unsaturated ketones to give 1,4-addition products selectively in good yields.
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