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Volume 7, Issue 6
Displaying 1-28 of 28 articles from this issue
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Yuji Miyahara, Takahiko Inazu, Tamotu Yoshino1978 Volume 7 Issue 6 Pages 563-566
Published: June 05, 1978
Released on J-STAGE: March 27, 2006
JOURNAL FREE ACCESSA new method for the synthesis of thiophenophanes which consists of cyclization of bischloroacetyl compounds with sodium sulfide and condensation of the resulting keto sulfides with glyoxal was developed. As an application a series of [n.1.1]paracyclo(2,5)thiophenoparacyclophanes (n=3,4,5,6,7,8,10) were synthesized.View full abstract -
Iwao Ojima, Tetsuo Kogure, Kazuo Achiwa1978 Volume 7 Issue 6 Pages 567-568
Published: June 05, 1978
Released on J-STAGE: March 27, 2006
JOURNAL FREE ACCESSAsymmetric hydrogenation of itaconic acid catalyzed by neutral and cationic rhodium(I) complexes with a chiral pyrrolidinodiphosphine, BPPM, was carried out to give (S)-(−)-methylsuccinic acid with 90–92 %e.e. in excellent yield. Enantioselectivity of the reaction was found to depend upon the amounts of triethyl amine added. In the presence of triethyl amine, the neutral catalyst is suggested to be converted to the cationic species.View full abstract -
Juro Ojima, Masamitsu Fujiyoshi1978 Volume 7 Issue 6 Pages 569-572
Published: June 05, 1978
Released on J-STAGE: March 27, 2006
JOURNAL FREE ACCESSPreparation of methyl-substituted monobenzo- 5, 6, and dibenzobisdehydro[13]annulenone 7 is described. The influence of methyl substituent and benzannelation upon the structure and tropicity of bisdehydro[13]annulenone is discussed.View full abstract -
Shin Suzuki, Osamu Koga, Rebati C. Das1978 Volume 7 Issue 6 Pages 573-574
Published: June 05, 1978
Released on J-STAGE: March 27, 2006
JOURNAL FREE ACCESSMass spectrometry by chemical ionization using CH4 and iso-C4H10 is found to be very suitable for identification and quantitative analysis of ethyl nitrate necessary for air-pollution study. It produces protonated molecular ion which is not obtained in the electron impact method.View full abstract -
CHEMOSELECTIVE REACTIONS OF ALLYLSILANES WITH 1,1-DIMETHOXYBUTAN-3-ONE AND 1,1-DIMETHOXYPROPAN-2-ONEIwao Ojima, Miyoko Kumagai1978 Volume 7 Issue 6 Pages 575-578
Published: June 05, 1978
Released on J-STAGE: March 27, 2006
JOURNAL FREE ACCESSThe reaction of allylsilanes with 1,1-dimethoxybutan-3-one was found to proceed selectively on the acetal moiety regardless of the kind of Lewis acid, while the chemoselectivity of the corresponding reaction with 1,1-dimethoxypropan-2-one was changed dramatically by the sort of Lewis acid employed.View full abstract -
Kazuhiko Ishizu, Tokuhiro Haruta, Kazuhiro Nakai, Kiyonori Miyoshi, Yu ...1978 Volume 7 Issue 6 Pages 579-582
Published: June 05, 1978
Released on J-STAGE: March 27, 2006
JOURNAL FREE ACCESSCuCl2 solubilized by Benzo-15-crown-5 in dry CHCl3 showed the anomalous g-anisotropy inversion (g|| <g⊥) in the ESR spectrum.
The spin Hamiltonian parameters determined were g||=1.995, g⊥=2.294 and |A|||=129.8×10−4 cm−1. Based on the ESR parameters, the bonding parameters of Cu(II) were calculated with application of the Swalen’s method. A weak bonding in the xy-plane of the paramagnetic site was assumed between the metal and the ligands, and a perturbation on the Cu(II) positive hole appears mainly due to the crystal field working along the z-axis, and the unpaired electron was suggested to occupy the dz2 orbital at the ground state.View full abstract -
Seiji Shinkai, Toyoko Ide, Osamu Manabe1978 Volume 7 Issue 6 Pages 583-586
Published: June 05, 1978
Released on J-STAGE: March 27, 2006
JOURNAL FREE ACCESSFacile isoalloxazine oxidation of aldehydes to carboxylic acids was achieved in the presence of a cationic micelle and CN− ion. The formation of a carbanion intermediate was proposed on the basis of the kinetic examinations. The role of the cationic micelle and CN− ion was discussed.View full abstract -
Taitiro Fujinaga, Yukio Nagaosa1978 Volume 7 Issue 6 Pages 587-588
Published: June 05, 1978
Released on J-STAGE: March 27, 2006
JOURNAL FREE ACCESSCadmium(II) in aqueous solution can be determined polarographically, following extraction as the thiocyanate into the acetonitrile layer which is produced by salting-out with sodium sulfate.View full abstract -
Shinya Nomoto, Tetsuo Shiba1978 Volume 7 Issue 6 Pages 589-590
Published: June 05, 1978
Released on J-STAGE: March 27, 2006
JOURNAL FREE ACCESSFirst synthetic method for preparation of N-methyl guanidino β-amino acid was established. Thus, Nβ -methyl-L-β-arginine, a component of the antibiotic LL-BM547β, was synthesized from Nγ-t-butoxycarbonyl-Nα-tosyl-L-α,γ-diaminobutyric acid through a successive reaction of Nα-methylation of tosylamino group with diazomethane, the Arndt–Eistert synthesis, and guanidination of the ω-amino group. The synthetic product was identical with the natural amino acid with respect to a specific rotation and NMR spectrum.View full abstract -
Takao Saito, Shinichi Motoki1978 Volume 7 Issue 6 Pages 591-594
Published: June 05, 1978
Released on J-STAGE: March 27, 2006
JOURNAL FREE ACCESS9-Fluorenethione S-p-toluenesulfonimide (I) reacted with 1,3-dienes on C=S bond of the imide to afford (2+4) cycloadducts, while with vinyl ethers the imide underwent a (3+2) type cycloaddition reaction to give isothiazolidines.View full abstract -
Kazuo Ohba, Junnosuke Fujita1978 Volume 7 Issue 6 Pages 595-596
Published: June 05, 1978
Released on J-STAGE: March 27, 2006
JOURNAL FREE ACCESSThe [CoBr(Hedta)]− complex prepared by the method of Schwarzenbach has been believed to consist of two geometric isomers. However, it was found that one of these two isomers was not the bromo complex, but the chloro complex.View full abstract -
Norisuke Hata, Toshiyuki Oguro1978 Volume 7 Issue 6 Pages 597-600
Published: June 05, 1978
Released on J-STAGE: March 27, 2006
JOURNAL FREE ACCESSThe photochemical behavior of 2-cyanoquinoline N-oxide and 4-methylquinoline N-oxide in aqueous ethanol containing potassium iodide or ethyl iodide was examined. The results indicate that Process I (N-oxide → lactam) proceeds via a protonation of the N→O group through a hydrogen-bonding interaction in the S1 state, whereas Process II (N-oxide → oxazepine) occurs with the formation of oxaziridine intermediate from the S1 state.View full abstract -
Toshio Sato, Kenso Soai, Keisuke Suzuki, Teruaki Mukaiyama1978 Volume 7 Issue 6 Pages 601-604
Published: June 05, 1978
Released on J-STAGE: March 27, 2006
JOURNAL FREE ACCESSOptically active alcohols possessing the R-configuration are produced in good optical yields by treating aromatic and aliphatic aldehydes with dialkylmagnesium by using the lithium salt of (2S, 2′S)-2-hydroxymethyl-1-[(1-methylpyrrolidin-2-yl)methyl]pyrrolidine as a chiral ligand.View full abstract -
Teruaki Mukaiyama, Shin-ichiro Shoda, Takashi Nakatsuka, Koichi Narasa ...1978 Volume 7 Issue 6 Pages 605-608
Published: June 05, 1978
Released on J-STAGE: March 27, 2006
JOURNAL FREE ACCESSA novel method for the preparation of trans nucleosides was developed by the use of 2-chloro-3-ethylbenzoxazolium tetrafluoroborate as a condensing reagent. Several trans nucleosides were prepared from 1-hydroxysugars and heterocycles in good yields under mild conditions.View full abstract -
Wataru Ando, Masayuki Ikeno1978 Volume 7 Issue 6 Pages 609-610
Published: June 05, 1978
Released on J-STAGE: March 27, 2006
JOURNAL FREE ACCESSUnder neutral and mild conditions, silyl enol ethers are synthesized in good yields by the reactions of ketones or aldehydes with dimethylsilylene, which generated by the photolysis of dodecamethylcyclohexasilane.View full abstract -
Yasutaka Ishii, Akihiko Adachi, Ryoichi Imai, Masaya Ogawa1978 Volume 7 Issue 6 Pages 611-614
Published: June 05, 1978
Released on J-STAGE: March 27, 2006
JOURNAL FREE ACCESSCyclohexanone was oxidized to 1-hydroxy-1′-hydroperoxydicyclohexyl peroxide(HHP) by TeO2- and to adipic acid by H2MoO4 and H2WO4. The oxidation products from cyclohexanone. 1-Hydroxy-1-hydroperoxycyclohexane(HHC) was proposed as a reaction intermediate.View full abstract -
Takakazu Yamamoto, Akio Yamamoto1978 Volume 7 Issue 6 Pages 615-616
Published: June 05, 1978
Released on J-STAGE: March 27, 2006
JOURNAL FREE ACCESSNi(C2H5)2(bpy) (bpy = 2,2′-bipyridine) reacts with CO2 in benzene at 40–50 °C to afford diethyl ketone and nickel propionate. Diethyl ketone seems to be formed through an intramolecular rearrangement in an intermediate product Ni(C2H5) (OCOC2H5) (bpy). A similar reaction of Ni(CH3)2(bpy) gives nickel acetate.View full abstract -
Masayoshi Ando, Kiyoshi Tajima, Kahei Takase1978 Volume 7 Issue 6 Pages 617-620
Published: June 05, 1978
Released on J-STAGE: March 27, 2006
JOURNAL FREE ACCESSSaussurea lactone, a typical elemanolide, has been synthesized via a novel fragmentation reaction of 3α,4α-epoxy-1β-mesyloxy-5αH, 6β, 11βH-eudesman-6,13-olide with aluminium isopropoxide in toluene.View full abstract -
Masamitsu Ochi, Hiyoshizo Kotsuki, Takashi Tokoroyama1978 Volume 7 Issue 6 Pages 621-624
Published: June 05, 1978
Released on J-STAGE: March 27, 2006
JOURNAL FREE ACCESSA new limonoid of biogenetic interest, sendanal, has been isolated from the fruit of M. azedarach Linn. var. japonica Makino and its structure also been deduced from its spectral data coupled with chemical evidence.View full abstract -
Yoshio Ono, Tadashi Tanabe, Nobumasa Kitajima1978 Volume 7 Issue 6 Pages 625-628
Published: June 05, 1978
Released on J-STAGE: March 27, 2006
JOURNAL FREE ACCESSThe mixtures of aluminum chloride and metal sulfate are found to be effective catalysts for the conversion of pentane at low temperatures. For example, when 10 ml of pentane was shaked with the equimolar mixture of AlCl3 and Ti2(SO4)3 (7.5 mmol each) at 28 °C for 3 hr, the pentane conversion of 46 % was obtained with the selectivity to isopentane of 84 %. In the vapor phase conversion, however, the main product was found to be isobutane.View full abstract -
Hideo Tsutsumi, Yoshio Awai, Yoshiharu Ishido1978 Volume 7 Issue 6 Pages 629-632
Published: June 05, 1978
Released on J-STAGE: March 27, 2006
JOURNAL FREE ACCESSA glycosyl isourea, prepared from a sugar derivative with free 1-hydroxyl group and a carbodiimide in the presence of cuprous chloride, was successfully subjected to the reaction with a series of protic nucleophiles to give the corresponding glycosyl compounds, i.e., 1-O-acylglycoses, phenyl glycosides, alkyl glycosides including disaccharides, and purine nucleosides, in good yields.View full abstract -
Yoshio Inoue, Yoshio Itoh, Harukichi Hashimoto1978 Volume 7 Issue 6 Pages 633-634
Published: June 05, 1978
Released on J-STAGE: March 27, 2006
JOURNAL FREE ACCESSTetraethyl-2-pyrone 1 was formed in good yields on the reaction of 3-hexyne with CO2 in the presence of Ni(COD)2–Ph2P(CH2)4PPh2 (COD=1,5-cyclooctadiene), and in case of Ni(COD)2–PPh3 a novel cyclotrimer, pentaethyl-5-propenylcyclopentadiene 2 was obtained selectively.View full abstract -
Hiroyasu Sato, Yoshihumi Kusumoto1978 Volume 7 Issue 6 Pages 635-638
Published: June 05, 1978
Released on J-STAGE: March 27, 2006
JOURNAL FREE ACCESSRaman spectra of liquid or crystalline alkali metal complexes (1:1) of 18-crown-6 and 15-crown-5 are characterized by a polarized band of high intensity near 865–870 cm−1. Raman spectra indicate the “freezing in” of conformations of crown ethers to a highly symmetric ones on complex formation.View full abstract -
Yoshio Sugiyama, Takashi Kawamura, Teijiro Yonezawa1978 Volume 7 Issue 6 Pages 639-642
Published: June 05, 1978
Released on J-STAGE: March 27, 2006
JOURNAL FREE ACCESSThe homoallylic rearrangement of the norborn-5-en-2-yl radical to the 3-nortricyclyl radical is observed by esr. An analysis of esr spectra of norborn-5-en-2-yl, benzonorbornen-2-yl, and naphthonorbornen-2-yl radicals suggests that the homoconjugation involved in these radicals is not large.View full abstract -
Heitaro Obara, Jun-ichi Onodera1978 Volume 7 Issue 6 Pages 643-644
Published: June 05, 1978
Released on J-STAGE: March 27, 2006
JOURNAL FREE ACCESSCarthamin and isocarthamin, the red pigments of the flowers of Safflower, have been reported hitherto as tautomers. As a result of the reexamination of the relation between the pigments it was found that carthamin is not a tautomer of isocarthamin but pyridine salt of the isocarthamin.View full abstract -
Hideaki Tsuneki, Hiroo Niiyama, Etsuro Echigoya1978 Volume 7 Issue 6 Pages 645-648
Published: June 05, 1978
Released on J-STAGE: March 27, 2006
JOURNAL FREE ACCESSRedox properties of Ag3PMo12O40 were studied by means of IR spectroscopy combined with 18O-tracer technique. Oxygen of innercore oxy-anion, PO43− , were not removed by reduction with H2, although IR spectra due to PO43− drastically changed. Exchange of terminal and bridge-bonded oxygen was so fast under the condtion employed here that all the oxygens equally participated for the redox cycles of the compound.View full abstract -
DIELS-ALDER REACTIONS OF TRIMETHYLSILOXY-SUBSTITUTED BUTADIENES WITH DIMETHYL ACETYLENEDICARBOXYLATEKeiji Yamamoto, Shigeaki Suzuki, Jiro Tsuji1978 Volume 7 Issue 6 Pages 649-652
Published: June 05, 1978
Released on J-STAGE: March 27, 2006
JOURNAL FREE ACCESSA variety of trimethylsiloxy-substituted butadienes, including novel 1-methoxy-1,3-bis(trimethylsiloxy)butadiene, react in a Diels–Alder process with dimethyl acetylenedicarboxylate. The adducts were converted, via elimination or oxidative aromatization, into four corresponding dimethyl hydroxy-substituted phthalates in good to moderate yields.View full abstract -
Kazuhiko Tanaka, Hideki Uneme, Nobuyuki Yamagishi, Noboru Ono, Aritsun ...1978 Volume 7 Issue 6 Pages 653-656
Published: June 05, 1978
Released on J-STAGE: March 27, 2006
JOURNAL FREE ACCESSDianion of α-mercapto-γ-butyrolactone was successfully generated by treating α-mercapto-γ-butyrolactone with lithium diisopropylamide-N,N,N′,N′-tetramethylethylenediamine at −78°C in THF. This dianion was found to be highly reactive toward electrophilic reagents. A new methodology for the stereoselective synthesis of α-alkylidene-γ-butyrolactones by one-pot procedure has been developed.View full abstract
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