-
Izumi Ichinose, Hiroyuki Senzu, Toyoki Kunitake
1996 Volume 25 Issue 10 Pages
831-832
Published: 1996
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Ultrathin films of TiO
2-based gel were prepared by repeating adsorption of titanium(IV) butoxide (Ti(O-nBu)
4) and subsequent hydrolysis of the surface. Linear film growth was observed for at least 20 cycles, as monitored by quartz crystal microbalance (QCM). Similar thin films were prepared from aluminum(III) butoxide (Al(O-nBu)
3), zirconium (IV) propoxide (Zr(O-nPr)
4), niobium(V) butoxide (Nb(O-nBu)
5), tetramethyl orthosilicate (Si(O-Me)
4), and their combinations.
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Shingo Sato, Heitaro Obara, Toshihiro Kumazawa, Jun-ichi Onodera, Kimi ...
1996 Volume 25 Issue 10 Pages
833-834
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(+)- and (−)-Model compounds of a carthamin were synthesized. The absolute configuration of carthamin was deduced to be
S,
S by means of CD spectroscopy and X-ray analysis.
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Hexing Li, Jingfa Deng
1996 Volume 25 Issue 10 Pages
835-836
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A new method has been developed to design BZ type oscillators. A lot of new BZ oscillators including inorganic oscillators and oscillators with amino acids and some peptides as substrates have been obtained by this way.
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Kazuki Sada, Tomohiro Maeda, Mikiji Miyata
1996 Volume 25 Issue 10 Pages
837-838
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Chiral discrimination of 1-phenylethylamine (
1) by diastereomeric salt formation with bile acids is described. X-ray crystallographic studies of the salts between cholic acid (
2a) and (
R)-, (
S)-, and (
RS)-
1 reveal that more densely packed (
S)-
1+
2a salt crystallizes preferentially by treatment of
2a from racemic
1.
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Mitsunari Uno, Shigetoshi Takahashi
1996 Volume 25 Issue 10 Pages
839-840
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New cationic (trisubstituted cyclopentadienyl)(cymene)ruthenium(II) complexes were prepared and shown to form host-guest complexes with various anions, providing the first examples of the anion receptors based on cationic ruthenium complexes.
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Hidehiro Sakurai, Motoki Yamane, Masahiro Iwata, Nobuo Saito, Koichi N ...
1996 Volume 25 Issue 10 Pages
841-842
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A convenient method for the preparation of a bissilyl ketone is developed via a bissilyl ketone acetal as its percursor. The bissilyl ketone reacts with electron deficient alkynes and alkenes in the presence of Pd(0) catalyst to give bis-silylated products.
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Tomohiro Okawa, Toshiyuki Sugimori, Shoji Eguchi, Akikazu Kakehi
1996 Volume 25 Issue 10 Pages
843-844
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The intramolecular aza-Wittig reaction of (5
S)-
N-[2-(trisubstituted-phosphoranylidene)aminobenzoyl]-2-pyridone-5-carboxylic acid derivatives chemoselectively gave 5-pyrrolo[2,1-
c][1,4]benzodiazepinone derivatives or 5(1
H)-pyrrolo[2,1-
b]quinazolinone derivatives depending on the substituents.
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Hajime Nagano, Yukiko Azuma
1996 Volume 25 Issue 10 Pages
845-846
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Diastereoselectivity in the radical mediated allylation and deuteration reactions of β-chiral β-alkoxy-α-bromoaldehyde dimethyl acetals and a relaed alkoxy bromide were remarkably enhanced when the reactions were conducted in the presence of Lewis acid (MgBr
2·OEt
2 for allylation; MgI
2 for deuteration).
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Joe Otsuki, Kinu Sato, Masayuki Tsujino, Naotoshi Okuda, Koji Araki, M ...
1996 Volume 25 Issue 10 Pages
847-848
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Mononuclear and dinuclear ruthenium complexes containing an azobipyridine ligand serve as reversible redox-responsive molecular switches modulating electron localization in the excited-state that can be read out through the emission intensity.
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Masahiro Mikuriya, Yasushi Hatano, Eiji Asato
1996 Volume 25 Issue 10 Pages
849-850
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Eight, seven-, and six-coordinate manganese(II) complexes with
N,
N′-bis(2-pyridinylmethylene)-1,3-diaminopropan-2-ol(HL) and
N,
N′-bis(2-pyridinylmethylene)-1,3-diaminopropane(L′), [Mn(HL)(NO
3)
2]·C
2H
5OH, [Mn(L′)(NO
3)
2], [Mn(L′)(bipy)(CH
3OH)](ClO
4)
2, [Mn(L′)(phen)](ClO
4)
2, and [MN
2(L)(CH
3COO)(phen)
2](ClO
4)
2·H
2O, have been isolated and characterized by X-ray crystallography.
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Nobukatsu Nemoto, Jiro Abe, Fusae Miyata, Makoto Hasegawa, Yasuo Shira ...
1996 Volume 25 Issue 10 Pages
851-852
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A new class of second-order nonlinear optical meterial: 2-[1-(4-butylpyridinio)]benzimidazolate dispersed in poly(methyl methacrylate) was investigated by the Maker fringe method using a Q-switched Nd:YAG laser (1064 nm), indicating that the poled film exhibited the second-order nonlinear optical coefficient,
d33, of 1.8 ± 0.2 pm V
−1.
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Satoshi Obika, Toshihiko Nishiyama, Satoshi Tatematsu, Kazuyuki Miyash ...
1996 Volume 25 Issue 10 Pages
853-854
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In asymmetric reduction of ketones with (
SS)-1-benzyl-3-(
p-tolylsulfinyl)-1,4-dihydropyridine as a NADH model compound, a stereospecific transfer of the 4-hydrogen was experimentally proved by the use of the 2-methyl congener and the 4-deuterated derivatives.
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Tetsuo Yonezawa, Yoshitaka Sakamoto, Kouji Nogawa, Takashi Yamazaki, T ...
1996 Volume 25 Issue 10 Pages
855-856
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Enantioselective hydrolyses of 2-chloroacetates derived from racemic 1,1,1-trifluoro-2-alkanols were found to proceed very smoothly in the presence of a catalytic amount of lipase MY to yield the corresponding (
R)-alcohols with high optical purity. In this procedure, Purification was easily carried out only by a simple distillation of the reaction mixture, enabling us to extend this reaction in a larger scale.
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Yushi Oishi, Takayuki Kato, Miyuki Kuramori, Kazuaki Suehiro, Katsuhik ...
1996 Volume 25 Issue 10 Pages
857-858
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Molecular arrangement in an amorphous monolayer which was prepared on pure water at 293 K and transferred onto a mica substrate, was successfully observed for the first time with an atomic force microscope (AFM) in the case of dialkyl guanidinium,
DG.
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Yutaka Takaguchi, Naomichi Furukawa
1996 Volume 25 Issue 10 Pages
859-860
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A new spirotellurane, 1,1′-spirobi (3
H -2,1-benzothiatellurole)-3,3′-dione [10-Te-4(C2S2)] (
2), having two sulfur atoms as the apical ligands and two carbon atoms as the equatorial ligands was obtained by the reaction of the spirotellurane
1 with Lawesson’s reagent. The treatment of
2 with aqueous NaOH gave an unsymmetrical spirotellurane
4. The telluranes
1 and
2 underwent ring-opening reactions on treatment with P(NEt
2)
3 to afford the telluride
6.
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Koichi Mikami, Tomoko Yajima, Masahiro Terada, Susumu Kawauchi, Yoshii ...
1996 Volume 25 Issue 10 Pages
861-862
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Anti-ferroelectric (SmCA
*) and ferroelectric (SmC
*) phases of α-trifluoromethyl-β-methyl-substituted liquid crystalline (LC) molecules, synthesized highly diastereo- and enantioselectively through our chiral titanium complex-catalyzed fluoral-ene reaction, were determined by thermal analysis and electro-optic measurements. Phase transitions were thus found to be critically dependent on the diastereomeric excess (diastereotropic) for
ul (
Rα,
Sβ)-diastereomers of the LC molecules.
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Kenichi Niikura, Kyosuke Nagata, Yoshio Okahata
1996 Volume 25 Issue 10 Pages
863-864
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Selective binding process of proteins to DNA strands immobilized on an Au electrode of a quartz-crystal microbalance (QCM) was observed
in situ from frequency decrease (mass increase). The binding kinetics of sequence specific binding of NFI to DNA containing its recognition site were compared with those of non-specific binding of histone f3.
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Tetsuo Kusumoto, Kumiko Ogino, Tamejiro Hiyama, Tadaaki Isozaki, Yoshi ...
1996 Volume 25 Issue 10 Pages
865-866
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Liquid crystalline compound having a chiral
trans-2-pentylcyclopentyl ester group exhibited stable antiferroelectric chiral smectic C phase whereas its cis isomer showed an unidentified smectic phase.
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Kuninobu Kasuga, Makoto Kawashima, Kenichiro Asano, Tamotsu Sugimori, ...
1996 Volume 25 Issue 10 Pages
867-868
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The selective preparation of 1,8,15,22-tetra(3′-pentoxy)phthalocyanine from 3-(3′-pentoxy)-1,2-dicyanobenzene was carried out. Its nickel(II) complex was obtained from the phthalocyanine and nickel(II) chloride, and a crystal structure of the complex was determined by an X-ray analysis.
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Makoto Komiyama, Jun Kamitani, Jun Sumaoka, Hiroyuki Asanuma
1996 Volume 25 Issue 10 Pages
869-870
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Diribonucleotides are efficiently hydrolyzed by the combination of the lanthanum(III) ion and hydrogen peroxide at pH 7.2 and 30 °C. The rate constant for the hydrolysis of adenylyl(3′-5′)adenosine by the mixture of La(ClO
4)
3 (10 mmol dm
−3) and H
2O
2 (100 mmol dm
−3) is 7.7 × 10
−2 min
−1 (half-life 9 min), corresponding to a 460 fold cooperative promotion of the catalysis.
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Nobuaki Ohshiro, Fumie Takei, Kiyotaka Onitsuka, Shigetoshi Takahashi
1996 Volume 25 Issue 10 Pages
871-872
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Novel organometallic dendrimers containing platinum-acetylide units in the main chain have been synthesized using 1,3,5-triethynyl-2,4,6-trimethylbenzene (
4) as a bridging ligand up to a nonanuclear complex (
8).
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Geunsu Lee, Yuji Miyahara, Takahiko Inazu
1996 Volume 25 Issue 10 Pages
873-874
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The reaction of benzylamine with 2,6-bis(bromomethyl)pyridine has now been found to provide the trimeric title compound as the major product instead of the reported dimer. When the reaction was conducted in two steps, a new tetrameric pyridinophane was isolated as the major product.
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Tsuneo Imamoto, Masayoshi Nishiura, Yoshinori Yamanoi, Hideyuki Tsurut ...
1996 Volume 25 Issue 10 Pages
875-876
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The molecular structures of [M(OTf)
2(hmpa)
4]OTf·CHCl
3(OTf = OSO
2CF
3; M = Y, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu), [Sc(OTf)
2(hmpa)
4]OTf, and [La(
η2-OTf)(OTf)(hmpa)
4]OTf·CHCl
3 were accurately determined by single crystal X-ray analyses. Tetrad effects are manifested in the series of the coordinate bond lengths.
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Toshiaki Murai, Makiko Fujii, Takahiro Kanda, Shinzi Kato
1996 Volume 25 Issue 10 Pages
877-878
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Selenothioic acid
S-alkyl esters were treated with Et
3N and Cd(OAc)
2·2H
2O to give symmetrically substituted selenophenes, whereas the similar reaction in the presence of alkyl halides afforded ketene selenothioacetals in moderate yields.
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Hiromi Sakurai, Reiji Kumai, Akira Izuoka, Tadashi Sugawara
1996 Volume 25 Issue 10 Pages
879-880
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N,
N-Dimethylamino nitronyl nitroxide (
1) and its homologues were prepared. One-electron oxidation of these open-shell donors were fond to afford ground state triplet species based on the ESR spectroscopic measurements. The electronic structure of
1+• is characterized by the presence of the two singly occupied orbitals (SOMO and SOMO′) and can be regarded as a hetero-analogue of trimethylenemethane.
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Yasuhiro Inada, Yumi Sugimoto, Yuko Nakano, Shigenobu Funahashi
1996 Volume 25 Issue 10 Pages
881-882
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The kinetic parameters for the formation of the sitting-atop (SAT) complex of the copper(II) ion with 5,10,15,20-tetraphenylporphyrin (H
2tpp) were directly determined in acetonitrile. The large
ΔH≠ and
ΔS≠ values imply that deformation of the porphyrin ring is required during the activation process. In the SAT complex, the protons bound to the pyrrole nitrogens remain on the nitrogens and by the addition of a base such as pyridine, they are abstracted to form the Cu(tpp) complex, in which the copper(II) ion is incorporated into the porphyrin core.
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Mitsuo Sato, Hirofumi Uehara
1996 Volume 25 Issue 10 Pages
883-884
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A new computer modelling system for derivation of basic units in zeolite frameworks was developed on the basis of graph theory and molecular simulation. In the first step, all the kinds of concentric clusters(CCL) were derived on the basis of graph theory, and in the second step, three dimensional models of them were constructed by means of molecular mechanics simulation. In the 2nd CCLs, all the combinations of 4- and 5-membered rings in zeolite frameworks were realized systematically.
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Kenji Hanabusa, Kouji Shimura, Kazunori Hirose, Mutsumi Kimura, Hirofu ...
1996 Volume 25 Issue 10 Pages
885-886
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Low-molecular weight compounds having ureylene segment was able to cause physical gelation in organic solvents. The main driving force for gelation was intermolecular hydrogen bonding between ureylene units.
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Yasushi Morimoto, Katsuhiro Ando, Mitsunari Uno, Shigetoshi Takahashi
1996 Volume 25 Issue 10 Pages
887-888
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Racemates of planar-chiral cyclopentadienyl-rhodium and -iron complexes, Cp′Rh(cod) and Cp′Fe(CO)
2Y (Cp′: trisubstituted cyclopentadienyls, Y = alkyl or halogen) are optically resolved on a preparative scale into enantiomers with efficincies of 100 and 50%ee, respectively, by liquid chromatography on a polyamide column using aqueous β-cyclodextrin as a mobile phase.
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Seiichi Inoue, Masatoshi Asami, Kiyoshi Honda, Hidekazu Miyazaki
1996 Volume 25 Issue 10 Pages
889-890
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Salicylaldehydes reacted with 5-methyl-4-hexen-1-ol (
4a) or 6-methyl-5-hepten-2-ol (
4b) in benzene in the presence of trimethyl orthoformate and a catalytic amount of
p-toluenesulfonic acid at rt to give angularly-fused
trans-5,5-dimethyl-3,4,4a,10b-tetrahydro-2
H,5
H-pyrano[3,2-c][1]benzopyrans (
6) in high yields with complete stereoselectivity.
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Shigeori Takenaka, Yousuke Funatu, Hiroki Kondo
1996 Volume 25 Issue 10 Pages
891-892
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A mixture of ferrous-bipyridine complexes carrying an adenosine or thymidine 20-mer on the ligand forms a two-dimensional molecular network through hybridization of the complementary oligonucleotides.
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Shuichi Naito, Noriyuki Amemiya
1996 Volume 25 Issue 10 Pages
893-894
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Higher selectivity for oxygenated products was observed in CO-H
2 reaction when hydrogen was supplied separately by the permeation through Pd membrane, than that when both CO and H
2 were supplied on Pd surface from the gas phase, indicating the direct participation of bulk hydrogen for oxygenated product formation.
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Shu Guo Zhang, Yuichi Ichihashi, Hiromi Yamashita, Takashi Tatsumi, Ma ...
1996 Volume 25 Issue 10 Pages
895-896
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The titanium silicalite-2 (TS-2) catalyst exhibits a photoluminescence spectrum at around 450–550 nm as well as the distinct and characteristic photocatalytic activity towards the direct decomposition of NO into N
2, O
2 and N
2O at 295 K under UV irradiation. XAFS and photoluminescence investigations indicated that the charge transfer excited state of the titanium oxide moieties having a tetrahetral coordination plays a significant role in the photoluminescence and photocatalytic reactivities of the TS-2 catalyst.
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Yuriko Nitta, Kazuya Kobiro
1996 Volume 25 Issue 10 Pages
897-898
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The enantioselectivity of a cinchonidine-modified Pd/TiO
2 catalyst varied with the extent of conversion in the hydrogenation of (
E)-α-phenylcinnamic acid. The incremental enantioselectivity reached a maximum at an early stage of the reaction. Under optimized reaction conditions, optical yields of up to 72 %e.e. of (
S)-(+)-2,3-diphenylpropionic acid were obtained at 100 % conversion.
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Katsura Mochizuki, Sen Miyashita
1996 Volume 25 Issue 10 Pages
899-900
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A binuclear Cu(II) complex with a bimacrocyclic ligand, [Cu
2(OH
2)
2L](ClO
4)
4·4H
2O (L: 7,7′-tetramethylene-bis[2,12-dimethyl-3,7,11,17-tetraazabicyclo[11.3.1]heptadeca-1(17),2,11,13,15-pentaene]) has the open conformation, in which the tetramethylene chain is staircase-like so that two macrocycles are as far apart as possible. [Cu
2Cu
2L](ClO
4)
2·H
2O adopts the closed conformation, in which the tetramethylene chain is folded so that the two macrocycles face each other.
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Makoto Minato, Takashi Nakamura, Takashi Ito, Takeaki Koizumi, Kohtaro ...
1996 Volume 25 Issue 10 Pages
901-902
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The phosphido-bridged molybdenum and tungsten complexes [Cp
2M(H)(μ-PPh
2)M′(H)Cp
2]
+(OTs)
− (M, M′ = Mo, W) were prepared and characterized. The X-ray crystallography for the complex (M = M′ = Mo) indicated that it has a novel symmetrical structure with regard to two metal centers.
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Hua-Zhong Yu, Yong-Qiang Wang, Sheng-Min Cai, Zhong-Fan Liu
1996 Volume 25 Issue 10 Pages
903-904
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The apparent electron-transfer rates of a new class azobenzene self-assembled monolayers on gold decreased significantly with increasing chainlength of terminal groups. With terminal groups longer than three carbon atoms, no distinguish feature for faradic response was observed.
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Hiroki Sakaguchi, Yukio Gotoh, Gin-ya Adachi
1996 Volume 25 Issue 10 Pages
905-906
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It has been found that an LaNi
5 hydride treated with a CO gas is stable in air at room temperature. The hydrogenation of acetophenone or 1-octene was performed using the CO-treated hydride. The reaction well proceeded and it was confirmed that hydrogen confined in the hydride can be available for reactions. The use of the CO-treated LaNi
5 hydride, therefore, can simplify the operation for hydrogenation.
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Tsuyoshi Akiyama, Hiroshi Imahori, Anawat Ajawakom, Yoshiteru Sakata
1996 Volume 25 Issue 10 Pages
907-908
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Porphyrin-linked fullerene bearing methylthio group was prepared by 1,3-dipolar cycloadditon of the azomethine ylide, generated
in situ using N-methylglycine and a formylporphyrin, with C
60. Self-assembled monolayer was formed by soaking Au electrode into a solution of the porphyrin-C
60 dyad. The photocurrent was observed for the photochemical cell in the presence of electron carrier under illumination.
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Jia Wang, Ryoji Nomura, Takeshi Endo
1996 Volume 25 Issue 10 Pages
909-910
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An addition of samarium iodide (SmI
2 or SmI
3) drastically suppressed the trimerization of isocyanates during the polymerization with alkyllithiums, providing the polymer with high molecular weight in good yield.
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Takanori Nishioka, Shigeyuki Nakamura, Yuichi Kaneko, Takayoshi Suzuki ...
1996 Volume 25 Issue 10 Pages
911-912
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Reaction of [{(RhCp
*)
2(μ-CH
2)
2}
2(μ
4-S
4)]
2+ (Cp
* = η
5-C
5Me
5) (
1) containing a rectangular S
4 ligand with the reducing agent of NaBH
4 affords [(RhCp
*)
2(μ-CH
2)
2(μ-S
2)] (
2) confirmed by FAB mass and
1H NMR spectra. This disulfide complex is so air-sensitive that the S
2 ligand is easily oxygenated by oxygen to give an SSO ligand in [(RhCp
*)
2(μ-CH
2)
2(μ-SSO)] (
3) whose structure is determined by X-ray analysis.
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Kazuhiko Furuya, Hajime Torii, Yukio Furukawa, Mitsuo Tasumi
1996 Volume 25 Issue 10 Pages
913-914
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The density functional theory has been used for calculating the structures and vibrational wavenumbers of the radical anion and cation of biphenyl. The radical anion has a planar structure, while the radical cation is twisted. Upon ionization, structural changes occur in the direction from benzenoid to quinoid. Unscaled wavenumbers calculated at the Becke-Lee-Yang-Parr/6-31G
* level are mostly in agreement with observed vibrational wavenumbers in the literature.
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Masayasu Akiyama, Akira Katoh, Yuriko Mutsui, Yuichi Watanabe, Kimiko ...
1996 Volume 25 Issue 10 Pages
915-916
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A dodecapeptide trihydroxamate ligand forms a well-defined chiral complex with iron(III) in which this small linear peptide assumes a unique loop conformation, uncommon to protein structures. The complex exhibits siderophore activity for a test microorganism.
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Mamoru Ai, Kyoji Ohdan
1996 Volume 25 Issue 10 Pages
917
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Glyoxylic acid was obtained by a vapor phase oxidative dehydrogenation of glycolic acid over an iron phosphate catalyst with a P/Fe atomic ratio of 1.2. The one-pass yield reached 59 mol% at the glycolic acid conversion of 78%; the selectivity of 76 mol%.
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