-
Shuichi Naito, Mitsutoshi Tanimoto
1990 Volume 19 Issue 12 Pages
2145-2148
Published: 1990
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Investigation on the effect of dispersing small particles of TiO
2 over silica upon the rate and mechanism of propene–deuterium reaction revealed that lower loading catalysts (1–8 wt%) exhibit markedly different catalytic behavior from that over unloaded TiO
2.
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Masahiko Iyoda, Masaji Oda, Yasushi Kai, Nobuko Kanehisa, Nobutami Kas ...
1990 Volume 19 Issue 12 Pages
2149-2152
Published: 1990
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The thermal and nickel-catalyzed cyclodimerization of the hexapentaene produced two types of [4]radialenes. The X-ray structural analysis of the thermal dimer has shown that the molecule has a pinwheel-like structure with the exactly planar central four-membered ring.
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Katsuhiko Inomata, Takaki Hirata, Yoshihiro Sasada, Takahiro Asada, Hi ...
1990 Volume 19 Issue 12 Pages
2153-2156
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It was revealed by X-ray crystallography that α-unsubstituted (
E)-vinyl sulfones have syn-conformation which seems to be the cause of “syn-effect” found in the conversion of (
E)-vinyl sulfones to the corresponding allyl sulfones with a base under mild conditions. Syn-conformation of a terminal olefin in solid state was also confirmed.
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Yaeko Gotoh, Tadashi Iihara, Naokuni Kanai, Naoki Toshima, Hidefumi Hi ...
1990 Volume 19 Issue 12 Pages
2157-2160
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Highly coheterotactic poly(methyl methacrylate-
alt-styrene)s have been synthesized by using boron trichloride excess to methyl methacrylate at low temperature below −60 °C. The highest value of their coheterotacticities in triad sequence was about 90 mol%, which is the highest in heterotacticity among the polymers ever reported.
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Ryohei Yamaguchi, Takashi Hamasaki, Kiitiro Utimoto, Sinpei Kozima, Hi ...
1990 Volume 19 Issue 12 Pages
2161-2164
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Organotin-aided three component couplings of C=N double bonds with 2,4-pentadienyl and α,β-unsaturated acyl groups followed by intramolecular Diels–Alder reactions result in highly stereoselective bicycloannulation of the C=N double bonds to afford
allo-berbane and
allo-yohimbane systems in one-flask operation.
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Kazuhiro Maruyama, Masakazu Hashimoto, Hitoshi Tamiaki
1990 Volume 19 Issue 12 Pages
2165-2166
Published: 1990
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N
α-Acetyl-N
ε-(2-anthraquinonyl)-L-lysine methyl ester underwent a photocyclization reaction in an acetonitrile solution to produce piperidine derivatives. The cyclization might proceed via a novel process that carbon-centered radical formed at the ε-position attacked the α-amido group in the molecule, followed by the formation of C–N bond.
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Nobuko Kanehisa, Yasushi Kai, Nobutami Kasai, Hajime Yasuda, Yuushou N ...
1990 Volume 19 Issue 12 Pages
2167-2170
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Reactions of Group 4–6 metal halides with 2,6-dimethylphenoxy(trimethyl)silane in THF afford pure compounds of type MX
1[O-2,6-(CH
3)
2C
6H
3]
m(THF)
n(M = Ti, Zr, Hf with l = 3, m = 1, n = 2 or l = 2, m = 2, n = 2; M = Nb, l = 4, m = 1, n = 1 or l = 3, m = 2, n = 1; M = W, l = 5, m = 1, n = 0 or l = 4, m = 2, n = 0) in >75% yields. Geometries of TiCl
2[O-2,6-(CH
3)
2C
6H
3]
2(THF)
2 and NbCl
3[O-2,6-(CH
3)
2C
6H
3]
2(THF) were determined by the X-Ray diffraction method.
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-
Yusuke Izumi
1990 Volume 19 Issue 12 Pages
2171-2174
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Oximes such as cyclohexanone oxime and benzaldehyde oxime were catalytically transformed into the corresponding lactams in
N,
N-dimethylformamide solutions of alkylating reagents such as trialkyloxonium salts. Catalyst turnover attained 43 on the basis of the acid used to obtain alkylating reagent.
O-Alkyl-
N,
N-dimethylformamidinium salt was suggested to be a catalyst species.
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Hiroshi Yamashita, Bella L. Roan, Masato Tanaka
1990 Volume 19 Issue 12 Pages
2175-2176
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Organic halides such as PhI, ArBr, and β-bromostyrene reacted with di- or monochlorovinylsilanes or triethoxyvinylsilane in the presence of triethylamine and palladium catalysts to give β-substituted vinylsilanes in excellent to moderate yields.
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Zhong-Fan Liu, Kazuhiko Hashimoto, Akira Fujishima
1990 Volume 19 Issue 12 Pages
2177-2180
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A direct electrochemical quantification method for the trans/cis interconversion reaction of some azobenzene derivatives in a solid monolayer film was developed, on the basis of the photoelectrochemical hybrid phenomenon that we found.
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Toru Sugaya, Nobuyuki Kato, Shinji Tomioka, Kentaro Tamaki
1990 Volume 19 Issue 12 Pages
2181-2182
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Novel non-prostanoid thromboxane A
2 receptor antagonists were synthesized stereoselectively using the transformation of (
E,
Z)-1-azadiene intermediates to the only (
E) isomers under acidic conditions.
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Masamitsu Ochi, Koji Yamada, Kensuke Futatsugi, Hiyoshizo Kotsuki, Koz ...
1990 Volume 19 Issue 12 Pages
2183-2186
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The structures of litophynin D and E, two new diterpenoids isolated from a soft coral
Litophyton sp., have been established on the basis of spectral and chemical evidence.
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Minoru Suzuki, Nobuhiko Kowata, Hirokazu Kobayashi, Isao Tanaka
1990 Volume 19 Issue 12 Pages
2187-2190
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A new sesquiterpene alcohol was isolated from the title alga, and its structure established as (
E,5
S,7
S)-germacra-1(10),4(15),11-trien-5-ol by an X-ray crystallographic analysis of the
p-bromobenzoate derivative.
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Soichiro Kyushin, Yasuhiro Nakadaira, Mamoru Ohashi
1990 Volume 19 Issue 12 Pages
2191-2194
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Tetraalkylsilanes, -germanes, and -stannanes reacted with a pyrylium salt to yield alkylated pyrans via photoinduced electron transfer.
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Masaaki Yoshifuji, Kozo Toyota, Michiko Murayama, Hideki Yoshimura, Ak ...
1990 Volume 19 Issue 12 Pages
2195-2198
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Sterically protected bis(phosphinidene)cyclobutenes were prepared starting from the diphosphane and their isomerism involving a 1,6-diphosphahexa-1,2,4,5-tetraene intermediate, which is both cumulative and conjugated, was studied. X-Ray crystallographic study of the (
E,
Z)-phosphinidenecyclobutene shows that the molecule suffers from large steric congestion between intra- and inter-substituents.
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Hitoshi Takeshita, Akira Mori, Yukari Ikeda, Nobuo Kato
1990 Volume 19 Issue 12 Pages
2199-2200
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Two retainers of 1-(2,4-dimethyl-3-pentyl)cyclohepta[
b]pyrrol-2(1
H)-one could be isolated by means of the HPLC at 0 °C. Its rotational barrier, measured by the line shape analysis of the low-temperature
1H NMR spectra, was 86.8 kJ/mol at 25 °C in CDCl
3.
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Teruaki Mukaiyama, Isamu Shiina, Shu Kobayashi
1990 Volume 19 Issue 12 Pages
2201-2204
Published: 1990
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Three types of sugars, 6-deoxy-L-tallose,4-C-methyl-D-ribose, and D-ribose were synthesized from both achiral starting materials, α,β-unsaturated aldehydes and silyl enol ethers of α-benzyloxy thioesters, by successive asymmetric aldol and vicinal dihydroxylation reactions.
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-
Kentaro Takagi
1990 Volume 19 Issue 12 Pages
2205-2206
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Nickel(0) complex induced the catalytic reaction of
o-iodobenzamide or
o-iodobenzonitrile with thioureas giving rise to cyclized products, 4H-2,3-dihydro-2-imino-1,3-benzothiazin-4-one or 4H-2,3-dihydro-1,3-benzothiazine-2,4-diimine.
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Nobujiro Shimizu, Makoto Sakai, Yuho Tsuno
1990 Volume 19 Issue 12 Pages
2207-2208
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Erythro- and
threo-1-methyl-2-phenylpropyl tosylates regiospecifically undergo syn β-elimination on treatment with butyllithium in THF with 88 and 96% d. e. respectively.
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Michinori Oki, Yasushi Taguchi, Shinji Toyota, Katsumi Yonemoto, Gaku ...
1990 Volume 19 Issue 12 Pages
2209-2212
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Whereas diazotization of
ap-2-(1,4-dimethyl-9-triptycyl)-2-methylpropylamine in benzene afforded expected hydrocarbons in addition to a small amount of 2-(1,4-dimethyl-9-triptycyl)-2-methylpropyl acetate, its
sc-isomer gave 1,1,3-trimethyl-2,3,7,11b-tetrahydro-7,11b-
o-benzeno-1H-benzo[
de]anthracene, and a larger amount of the acetate. The results provide unambiguous evidence that the 1-methyl group stabilizes the cation formed by diazotization.
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Shuji Okada, Hiro Matsuda, Atsushi Masaki, Hachiro Nakanishi, Kikuko H ...
1990 Volume 19 Issue 12 Pages
2213-2216
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A new conjugated polymer which has π-conjugation between two polydiacetylene backbones was synthesized by two-step solid-state polymerization of a dialkyltetraacetylene compound. This polymer is considered to be a fused-ring polymer of conjugated 10π-electron system.
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Hisashi Fujihara, Jer-Jye Chiu, Naomichi Furukawa
1990 Volume 19 Issue 12 Pages
2217-2220
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A new symmetrical dithio
peri-bridged naphthalene, dinaphtho[l,8-
b,
c]-1,5-dithiocin (
1) has been synthesized. The cyclic voltammogram of
1 showed one reversible oxidation peak. ESR spectrum of the coned H
2SO
4 solution of
1 showed the formation of the cation radical. The formation of the dication of
1 was observed in the reaction of the corresponding monosulfoxide with concd D
2SO
4 by both high-field
1H and
13C NMR spectroscopy.
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Masahiko Yamaguchi, Kazuhiko Torisu, Ken-ichi Hiraki, Toru Minami
1990 Volume 19 Issue 12 Pages
2221-2222
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Polymerization of 1-
t-butyldiphenylsilyl-1,3-butadiyne with MoCl
5-Et
3SiH catalyst gives a novel widely conjugated polyacetylene. An appropriate selection of the silyl group and catalyst is essential.
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Hideo Tomioka, Masahiko Kanda
1990 Volume 19 Issue 12 Pages
2223-2226
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Irradiation of 1,1,2,2-tetracyano-3,3-diphenylcyclopropane in the presence of triethylamine results in the formation of 1,1-dicyano-2,2-diphenylethylene, which is suggested to be formed as a result of spontaneous 1,2 elimination of stabilized ion pairs in the initially formed amine-cyclopropane adducts.
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Keiko Takahashi, Yutaka Ohtsuka, Kenjiro Hattori
1990 Volume 19 Issue 12 Pages
2227-2230
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6N(
N′-formyl-D- and L-phenylalanyl)-deoxyamino-β-cyclodextrins(I and II) indicate reversed enantiomeric selectivity when they include D- and L-dansylphenylalanine.
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Satoshi Nomura, Satoshi Okazaki
1990 Volume 19 Issue 12 Pages
2231-2234
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Fast scan cyclic voltammetry dramatically reduced the effect of consecutive chemical reaction involved in electrooxidation or reduction process of cyanine dyes. This electrochemical measurement has enabled to obtain more correct redox potentials of the dyes directly from cyclic voltammograms allowing more exact electrochemical characterization of spectral sensitizing dyes.
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Yi-qun Du, Takaoki Harada, Asao Nakamura, Akihiko Ueno, Fujio Toda
1990 Volume 19 Issue 12 Pages
2235-2238
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The invesitigation of photosensitized reduction of viologen-appended β-cyclodextrin (CDxEV
2+) using Rose Bengal as a sentizer has revealed that the reduction of the viologen moiety of CDxEV
2+ is remarkably affected by the presence of guests. The spatial position of the viologen moiety in CDxEV
2+, which can be changed by guest binding, is suggested to be the factor that governs the reduction.
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Teruaki Mukaiyama, Takashi Ohno, Takashi Nishimura, Jeong Sik Han, Shu ...
1990 Volume 19 Issue 12 Pages
2239-2242
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A novel catalyst system, trimethylsilyl chloride and indium(III) chloride, effectively catalyzes the reaction of
O-trimethylsilyl monothioacetals with triethylsilane and silylated carbon nucleophiles, respectively, to afford the corresponding sulfide derivatives in good to high yields.
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Susumu Sudoh, Takafumi Miyanaga, Shigehiro Ohta, Yoshitaka Nagao, Shig ...
1990 Volume 19 Issue 12 Pages
2243-2246
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The local structures of lanthanoid(III) chloranilate complexes have been studied by the extended X-ray absorption fine structure (EXAFS) spectroscopy. The Fourier transformed EXAFS spectra suggest that the complexes are rigid three dimensional network structures. The distances between a metal and coordinated atoms estimated from EXAFS spectra are correlated to the ionic radii of lanthanoid(III) ions very well.
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Takashi Aida, Reiji Higuchi, Hiroo Niiyama
1990 Volume 19 Issue 12 Pages
2247-2250
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Decomposition of Freon-12 (CCl
2F
2) and methyl chloride (CH
3Cl) over gold catalysts were studied. Au/Co
3O
4 showed a high activity for CH
3Cl but a lesser activity for CCl
2F
2 while Au/Al
2O
3 showed moderate activities for the both reactants. The first step of the reactions over Au/Al
2O
3 was considered as substitution of Cl by surface OH group on support surface.
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Masao Hisatome, Noriaki Maruyama, Tetsuo Furutera, Tomoyasu Ishikawa, ...
1990 Volume 19 Issue 12 Pages
2251-2254
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Several porphyrins linked to an adenine or thymine have been synthesized. Spectroscopic study suggested an interaction between the porphyrin ring and the base moiety, and indicated nucleoside base recognition ability of the compounds.
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Takashi Hiraga, Mikio Yamashita, Kenji Torizuka, Tetsuo Moriya
1990 Volume 19 Issue 12 Pages
2255-2258
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The 2-methyl-4-nitroaniline(MNA)-doped polymethyl methacrylate (PMMA) film was prepared for intracavity pulse compression of a short pulse laser. This organic film held between two cover glasses was formed by means of an evacuated hot-press apparatus. The ultra fast response to a femtosecond light pulse was observed, which shows 3rd order nonlinear optical effects.
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Tamotsu Takahashi, Yu Nitto, Takashi Seki, Masahiko Saburi, Ei-ichi Ne ...
1990 Volume 19 Issue 12 Pages
2259-2262
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Addition of one equivalent of RCH
2CH
2MgX to Cp
2ZrMe
2 (Cp = C
5H
5) in the presence of PMe
3 led to a transmetalation reaction to afford zirconocene-alkene complexes Cp
2Zr(RCH=CH
2)(PMe
3) in good yields along with the formation of MeMgX.
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Takaki Kanbara, Minoru Inami, Takakazu Yamamoto, Atsushi Nishikata, To ...
1990 Volume 19 Issue 12 Pages
2263-2266
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Poly(parabanic acid) (PPA) forms transparent homogeneous composites with lithium and sodium salt (LiClO
4, LiBF
4, Li[CF
3SO
3], NaClO
4, and NaBF
4) up to 30–60 wt% of the salt in the composite. The composites show electrical conductivity of 1.7 × 10
−5 S cm
−1 at 50 wt% of Li[CF
3SO
3] at 20 °C. The composites are thermally stable up to about 180 °C and temperature dependence of the electrical conductivity obeys Arrhenius type equation in most cases with activation energy of 0.6–1.0 eV.
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Masahiko Yamaguchi, Kazuhiko Torisu, Shigeo Nakamura, Toru Minami
1990 Volume 19 Issue 12 Pages
2267-2268
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Unstable monosilylated 1,3,5,7-octatetrayne was synthesized and lithiated with butyllithium. The resulted lithium acetylide added to aldehydes and a ketone giving tetraynols in high yields.
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Takahiro Fukumoto, Toshiaki Matsuki, Nan Xing Hu, Yoshio Aso, Tetsuo O ...
1990 Volume 19 Issue 12 Pages
2269-2272
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Three benzenetellurinic mixed anhydrides, i.e., benzenetellurinyl acetate, trifluoroacetate, and trifluoromethanesulfonate, have been found to be mild oxidizing agents for various substrates such as thiol, phosphine, acyloin, α-hydroxy ester, catechol, hydroquinone, thiourea, and thioamide. The reactions towards the last two substrates are highly chemoselective, depending on both the reagent and substrate.
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Ryoji Yanagihara, Shuichi Osanai, Sadao Yoshikawa
1990 Volume 19 Issue 12 Pages
2273-2276
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In aqueous or methanolic solution containing Ca
2+ and hydroxide ion, aldoses are rapidly epimerized at C-2. This reaction involves C-1,C-2 stereospecific rearrangement. [2-
13C]-D-Mannose is formed from [1-
13C]-D-glucose by this reaction.
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Masaaki Mishima, Yuho Tsuno, Mizue Fujio
1990 Volume 19 Issue 12 Pages
2277-2280
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Gas phase stabilities of substituted phenonium (ethylenearenium) ions have been determined based on bromide transfer equilibria. The phenonium ion has been found to be stable even more than
t-butyl cation, and the substituent effect on its stability has been analyzed based on the LArSR Eq., giving a ρ value of −17.5 and an
r of 0.60.
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Masaaki Mishima, Yuho Tsuno, Mizue Fujio
1990 Volume 19 Issue 12 Pages
2281-2284
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Gas-phase basicities (GB) of α,α,α-trifluoroacetophenones were determined by means of the pulsed ICR spectrometer. The substituent effect on the GB was correlated in terms of the LArSR Eq. with an
r of 1.20. The
r values for stabilities of a series of benzylic carbocation systems, ArC
+(
R1)
R2, could be related to electronic effects of
R1 and R
2.
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Ryushi Shundo, Ikuzo Nishiguchi, Yoshiharu Matsubara, Tsuneaki Hirashi ...
1990 Volume 19 Issue 12 Pages
2285-2288
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Novel carbon-carbon bond formation of non-activated olefins with ethyl cyanoacetate has been developed by anodic oxidation using only a small amount of Mn(OAc)
2·4H
2O to give selectively either saturated or unsaturated coupling products depending upon the presence of a catalytic amount of Cu(OAc)
2·H
2O.
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Hiroshi Mori, Hisashi Ueno, Noritaka Mizuno, Hidenori Yahiro, Masakazu ...
1990 Volume 19 Issue 12 Pages
2289-2290
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Proton exchanged ultrastable Y-type zeolite showed a pronounced catalytic activity for the formation of acetone directly from propene and water. The formation rate of acetone was higher or comparable to those on MoO
3-based catalysts in the oxidation of propene by oxygen to produce acetone.
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Takashi Sugimura, Tohru Futagawa, Akira Tai
1990 Volume 19 Issue 12 Pages
2291-2294
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Stereochemically pure tricyclic system consisting of seven and two three membered rings was prepared by highly regio- and diastereo-controlled successive cyclopropanations of cyclic unsaturated enol ether prepared from 2-cycloalkenone and optically pure 2,6-dimethyl-3,5-heptanediol.
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Takashi Sugimura, Tohru Futagawa, Akira Tai
1990 Volume 19 Issue 12 Pages
2295-2298
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Syntheses of (+)-africanol (
1) and (+)-isoafricanol (
2) were attempted by reductive radical cyclization of (1
S,2
S,8
S)-2-(4′-butenyl)-1,5,5-trimethyl-bicyclo[5.1.0]-3-octanone derived from (1
R,2
S,4
S,8
S)-4-alkoxy-1,6,6-trimethyl-tricyclo[6.1.0.O
2,4]nonane. This cyclization gave (+)-
1 and (+)-
2 as minor components, together with trans fused epimers as major components.
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Masatoshi Kawashima, Akihisa Hirayama
1990 Volume 19 Issue 12 Pages
2299-2300
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2,2′- Dihydroxy-1,1′-binaphthy1 (
1) was directly resolved with (1
R,2
R)-1,2-diaminocyclohexane to afford (
R)-(+)-
1 in a high yield with a high optical purity.
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