研究者詳細 - 田嶋　智之

論文 - 田嶋　智之

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Synthesis, Structures, and Properties of Plumboles 査読

Masaichi Saito, Masafumi Sakaguchi, Tomoyuki Tajima, Kazuya Ishimura, Shigeru Nagase

PHOSPHORUS SULFUR AND SILICON AND THE RELATED ELEMENTS 185 ( 5-6 ) 1068 - 1076 2010年

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：TAYLOR & FRANCIS LTD

Reactions of 1,4-dilithio-1,2,3,4-tetraphenyl-1,3-butadiene with dichlorodiphenylplumbane gave hexaphenylplumbole 1 and spirobiplumbole 2. These structures were determined by X-ray diffraction analysis. Electronic structures of 1 and 2 were discussed by the aid of NMR analysis and theoretical calculations. The compounds 1 and 2 were found to be the first fluorescent organolead compounds.

DOI： 10.1080/10426501003773399

Synthesis and structure of the dithienostannole anion 査読

Masaichi Saito, Munenori Shiratake, Tomoyuki Tajima, Jing Dong Guo, Shigeru Nagase

JOURNAL OF ORGANOMETALLIC CHEMISTRY 694 ( 25 ) 4056 - 4061 2009年12月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：ELSEVIER SCIENCE SA

Novel dithienostannoles were synthesized by the reactions of the corresponding dilithiobithiophenes with dichlorodiphenylstannane. A unique byproduct, 10-membered ring compound was also obtained. Reduction of type A dithienostannole with lithium afforded 2,2'-dilithio-3,3'-bithiophene, while reduction of type B dithienostannole with lithium afforded the corresponding dithienostannole anion. The structure and aromaticity of the dithienostannole anion are also discussed. (C) 2009 Elsevier B. V. All rights reserved.

DOI： 10.1016/j.jorganchem.2009.08.026

NOVEL REACTIONS OF STERIC ENCUMBERED 1,4-DILITHIO-1,3-BUTADIENE WITH GROUP 14 ELECTROPHILES: FORMATION AND STRUCTURE OF STABLE DIHYDROXYGERMOLE 査読

Masaichi Saito, Michio Nakamura, Tomoyuki Tajima

HETEROCYCLES 78 ( 3 ) 657 - 668 2009年3月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：PERGAMON-ELSEVIER SCIENCE LTD

Reactions of 1,4-dilithio-1,3-butadiene 1 having bulky silyl ligands at the 1,4-positions with group 14 electrophiles were examined. Reactions of 1,4-dilithio-1,3-butadiene 1 with tetraethoxygermane gave diethoxygermole 5, which was hydrolyzed to give stable dihydroxygermole 16. The X-ray diffraction analysis of dihydroxygermole 16 revealed intermolecular hydrogen bonds. The reaction of I with stannous chloride was also examined.

DOI： 10.3987/COM-08-11547

DECHALCOGENATION OF PENTACHALCOGENADISTANNA-BICYCLO[3.1.1]HEPTANES 査読

Masaichi Saito, Hizuru Hashimoto, Tomoyuki Tajima

HETEROCYCLES 76 ( 1 ) 515 - 520 2008年9月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：PERGAMON-ELSEVIER SCIENCE LTD

Pentathia- and pentaselena-distannabicyclo[3.1.1]heptanes reacted with tributylphosphine to afford tetrathia- and tetraselena- distanna-bicyclo[2.1.1]hexanes, respectively. The novel heterocyclic framework of a tetrathiadistannabicyclo[2.1.1]hexane was demonstrated by X-ray structural analysis. Structures of a series of pentachalcogena and tetrachalcogena derivatives are discussed.

DOI： 10.3987/COM-08-S(N)38

Synthesis and characterization of the first stable stannanetelone 査読

Norihiro Tokitoh, Tomoyuki Tajima, Nobuhiro Takeda, Takahiro Sasamori

PHOSPHORUS SULFUR AND SILICON AND THE RELATED ELEMENTS 183 ( 4 ) 948 - 955 2008年4月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：TAYLOR & FRANCIS LTD

The first example of a stable stannanetellone was synthesized and isolated by taking advantage of kinetic stabilization afforded by the combination of steric protecting groups, 2,6-bis[bis(trimethylsilyl)methyl]-4-[tris(trimethylsilyl)methyl]phenyl (Bbt) and 2,2 '',4,4 ''-tetraisopropyl-m-terphenyl-2'-yl groups. The structural parameters and spectroscopic data of the isolated stannanetellone were systematically compared with those previously reported for the lighter congeners, i. e., the stannanethione and stannaneselone. Attempted synthesis of a stannanetellone by the reaction of dilithiostannane with tellurium dichloride is also described.

DOI： 10.1080/10426500801900865

New reactions of a dibenzo[a,e]pentalene 査読国際誌

Masaichi Saito, Michio Nakamura, Tomoyuki Tajima

CHEMISTRY-A EUROPEAN JOURNAL 14 ( 20 ) 6062 - 6068 2008年

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：WILEY-BLACKWELL

Reduction of dibenzo[a,e]pentalene 3 (denoted as dibenzopentalene hereafter) with excess lithium gave dilithium dibenzopentalenide 1. Since oxidation of I with iodine gave 3, redox behavior between 1 and 3 is controllable and reversible. Reaction of 3 with methyllithium gave lithium 5-methyldibenzopehtalenide 5, the formation of which was evidenced by some trapping experiments and X-ray crystallographic analysis. Reactions of 3 with halogens gave 5,10-dihalodibenzopentalenes, 8 and 9. Some optical properties of novel dibenzopentalene derivatives are also demonstrated.

DOI： 10.1002/chem.200800451

Synthesis, structure and reactions of a trianion equivalent, trilithiostannane 査読国際誌

Tomoyuki Tajima, Masatoshi Ikeda, Masaichi Saito, Kazuya Ishimura, Shigeru Nagase

CHEMICAL COMMUNICATIONS ( 48 ) 6495 - 6497 2008年

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：ROYAL SOC CHEMISTRY

Transmetallation reaction of trisilylstannane ArSn( SiHMe(2))(3) (Ar = 2,6-bis(2,4,6-triisopropylphenyl)phenyl), bearing a bulky substituent on the tin atom, with methyllithium in THF at room temperature gave the first trianion equivalent, trilithiostannane ArSnLi(3), the generation of which was confirmed by trapping experiments with some electrophiles as well as by (119)Sn and (7)Li NMR spectroscopy.

DOI： 10.1039/b815371j

Synthesis and structure of pentaorganostannate having five carbon substituents 査読国際誌

Masaichi Saito, Sanae Imaizumi, Tomoyuki Tajima, Kazuya Lshimura, Shigeru Nagase

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY 129 ( 36 ) 10974 - + 2007年9月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：AMER CHEMICAL SOC

The reaction of spirostannabifluorene with methyllithium gave lithium pentaorganostannate, which is an intermediate of the transmetalation reaction on the tin atom and the first example of a stable pentaorganostannate having five carbon substituents. The X-ray structural analysis reveals its slightly distorted trigonal bipyramidal structure, the apical bonds of which have a considerable s character. The unique structure of the lithium pentaorganostannate is also discussed by the aid of theoretical calculations.

DOI： 10.1021/ja072478+

Synthesis and reactions of a novel bulky aryllithium 査読

Masaichi Saito, Yuta Okuyama, Tomoyuki Tajima, Daichi Kato, Michikazu Yoshioka

APPLIED ORGANOMETALLIC CHEMISTRY 21 ( 7 ) 604 - 611 2007年7月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：JOHN WILEY & SONS LTD

A novel bulky aryllithium, 2,6-bis{2,5-bis[bis(trimethylsilyl)methyl]phenyl}phenyllithium (BbspLi), was synthesized. Reactions of BbspLi 5 with Group 14 electrophiles, such as stannous chloride, with carbon tetrachloride or tetrachlorometallanes gave fluorene 6. Reaction of BbspLi with carbon tetrachloride gave benzyl chloride 8, which converted to 6 under acidic conditions. BbspLi 5 isomerized to the corresponding benzyl anion 10, which underwent halophilic reactions with Group 14 electrophiles to give fluorene 6 via the benzyl chloride intermediate 8. Copyright (c) 2007 John Wiley & Sons, Ltd.

DOI： 10.1002/aoc.1268

3,5-Bis(trimethylsilyl)triphenyleno[1,12bcd]thiophene 査読

Masaichi Saito, Tomoharu Tanikawa, Tomoyuki Tajima

ACTA CRYSTALLOGRAPHICA SECTION E-STRUCTURE REPORTS ONLINE 63 O2923 - U2631 2007年6月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：BLACKWELL PUBLISHING

In the title compound, C24H26SSi2, the fused ring system plus the two Si atoms are coplanar, consistent with planar triphenylene but contrary to bowl-shaped triphenyleno[1,12-bcd:4,5-b'c'd':8,9-b '' c '' d '']-trithiophene. The bond alternation pattern of the C-C bonds in the title compound is similar to that found in triphenyleno[1,12-bcd:4,5-b'c'd':8,9-b '' c '' d '']-trithiophene, although the lengths of the C-C bonds around the central and thiophene rings of the title compound are slightly different from the corresponding bonds of triphenyleno[1,12-bcd:4,5-b'c'd':8,9-b '' c '' d '']-trithiophene.

DOI： 10.1107/S1600536807022337

Synthesis and structures of polychalcogenadistannabicyclo[k.l.m]alkanes 査読

Masaichi Saito, Hizuru Hashimoto, Tomoyuki Tajima, Masatoshi Ikeda

JOURNAL OF ORGANOMETALLIC CHEMISTRY 692 ( 13 ) 2729 - 2735 2007年6月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：ELSEVIER SCIENCE SA

Reaction of steric encumbered trichlorostannane with disodium sulfide or dilithium selenide gave 2,4-dimercapto-1,3,2,4-dithiadistannetane or tetraselenadistannabicyclo[2.1.1]hexane, respectively. Reactions of steric encumbered trihydrostannane with elemental chalcogens gave pentachalcogenadistannabicyclo[k.1.1]heptanes (k = 2 and 3). The two bridgehead tin atoms of the first polychalcogenadistannabicyclo[k.l.m]alkanes are concluded to have no significant bonding interaction, judging from the longer bond distances than those of the normal tin-tin single bonds. (c) 2007 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.jorganchem.2007.02.004

Synthesis and structure of a kinetically stabilized stannanethione 査読

Tomoyuki Tajima, Takahiro Sasamori, Nobuhiro Takeda, Norihiro Tokitoh

BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 80 ( 6 ) 1202 - 1204 2007年6月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：CHEMICAL SOC JAPAN

The X-ray crystallographic analysis of a stable stannanethione, Bbt(Titp)Sn = S, reveals that the tin-sulfur bond distance [2.221(3) angstrom] is ca. 10 % shorter than the normal tin-sulfur single bonds and the tin atom of the stannanethione has a trigonal planar geometry, as do as the carbonyl carbon atoms.

DOI： 10.1246/bcsj.80.1202

Reduction of phenyl silyl acetylenes with lithium: Unexpected formation of a dilithium dibenzopentalenide 査読国際誌

Masaichi Saito, Michio Nakamura, Tomoyuki Tajima, Michikazu Yoshioka

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION 46 ( 9 ) 1504 - 1507 2007年

A kinetically stabilized stannanetellone, a tin-tellurium double-bonded compound 査読

Tomoyuki Tajima, Nobuhiro Takeda, Takahiro Sasamori, Norihiro Tokitoh

ORGANOMETALLICS 25 ( 15 ) 3552 - 3553 2006年7月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：AMER CHEMICAL SOC

A kinetically stabilized stannanetellone was synthesized by the telluration of an extremely hindered stannylene with (n-Bu)(3)Pd=Te. The structure of the stannanetellone was determined by X-ray crystallographic analysis.

DOI： 10.1021/om0604627

Synthesis of bis(germacyclopropa)benzenes and structures of their annelated benzene rings 査読

T Tajima, T Sasamori, N Takeda, N Tokitoh, K Yoshida, M Nakahara

ORGANOMETALLICS 25 ( 1 ) 230 - 235 2006年1月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：AMER CHEMICAL SOC

Extremely hindered bis(germacyclopropa)benzenes (3a,b; the IUPAC name is 4,8-digermatricyclo[5.1.0.0(3,5)]octa-1,3(5),6-triene) were synthesized as stable crystalline compounds by the reaction of the corresponding dilithiogermane Tbt(Dip)GeLi2 (8; Tbt = 2,4,6-tris[bis(trimethylsilyl)methyl]phenyl, Dip = 2,6-diisopropylphenyl) with 1,2,4,5-tetrabromobenzene. The structures of the two stereoisomeric his(germacyclopropa)benzenes (3a, cis isomer; 3b, trans isomer) were definitively determined by X-ray crystallographic analysis. The central benzene ring of 3a was found to be folded, in contrast to the planar benzene ring of 3b. The X-ray crystallographic analyses of 3a and 3b and the theoretical calculations for some model molecules revealed that the annelated benzene rings have no distinct bond alternation.

DOI： 10.1021/om0507629

Generation and reactions of overcrowded diaryldilithiostannane and diaryldipotassiostannane 査読

T Tajima, N Takeda, T Sasamori, N Tokitoh

EUROPEAN JOURNAL OF INORGANIC CHEMISTRY ( 21 ) 4291 - 4300 2005年11月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：WILEY-V C H VERLAG GMBH

Exhaustive reduction of an overcrowded dibromostannane bearing two bulky aromatic substituents, Tbt(Dip)SnBr2 {Tbt = 2,4,6-tris[bis(trimethylsilyl)methyl]phenyl; Dip = 2,6-diisopropylphenyl}, with an excess amount of lithium naphthalenide in THF at -78 degrees C gave the corresponding dilithiostannane, Tbt(Dip)SnLi2, the generation of which was confirmed by trapping experiments with some electrophiles together with Sn-119 and Li-7 NMR spectroscopy. The diaryldilithiostannane was found to be stable in solution under an inert gas below -25 degrees C. The potassium analogue, Tbt(Dip)SnK2, was also generated by the reduction of the dibromostannane in THF at -78 degrees C by the use of KC8 as a reductant. The reactions of dilithiostannane and dipotassiostannane obtained with o-dibromobenzene did not give a stannacyclopropabenzene derivative but an unexpected cyclization product, a stannacyclobutabenzene derivative, in contrast to the reactions of the corresponding dilithiosilane and dilithiogermane, Tbt(Dip)ELi2 (E = Si, Ge), with o-dibromobenzene leading to the formation of the corresponding metallacyclopropabenzenes as stable crystalline compounds. A preliminary result of the synthesis of a tin-tellurium double-bond compound from the dilithiostannane is also presented. ((c) Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005).

DOI： 10.1002/eijc.200500375

Reactivities of germacyclopropabenzene toward some transition metal carbonyl complexes 査読

T. Tajima, T. Sasaki, T. Sasamori, N. Takeda, N. Tokitoh

Applied Organometallic Chemistry 19 ( 4 ) 570 - 577 2005年4月

記述言語：英語掲載種別：研究論文（学術雑誌）

The thermal reactions of an overcrowded germacyclopropabenzene with group 6 metal hexacarbonyl complexes [M(CO)6] (M = Cr, Mo and W) resulted in the formation of novel Fischer-type carbene complexes via the insertion reaction of a C=O group to the Ge-C bond. By contrast, the germacyclopropabenzene reacts with [Co2(CO)8] to give a germanium analog of benzocyclobutanone via the insertion reaction of a CO unit into the germacyclopropane ring. The reaction of the germacyclopropabenzene with [Mn2(CO)10] resulted in the formation of the intramolecular cyclization product accompanying the migration of a trimethylsilyl group, i.e. a cyclobutabenzene derivative. Copyright © 2005 John Wiley & Sons, Ltd.

DOI： 10.1002/aoc.810

Thermal reactions of an overcrowded germacyclopropabenzene with group 6 metal hexacarbonyl complexes [M(CO)(6)] (M = Cr, Mo, and W): a novel mode of CO insertion leading to the formation of cyclic germoxycarbene metal complexes 査読国際誌

T Tajima, T Sasaki, T Sasamori, N Takeda, N Tokitoh

CHEMICAL COMMUNICATIONS ( 4 ) 402 - 403 2004年2月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：ROYAL SOC CHEMISTRY

Thermal reactions of an overcrowded germacyclopropabenzene with hexacarbonyl complexes of group 6 metals resulted in the formation of the corresponding cyclic germoxycarbene complexes, i.e., 1,2-oxagermolan-5-ylidene pentacarbonyl metal complexes, via a novel mode of CO insertion reaction toward cyclopropabenzene derivatives.

DOI： 10.1039/b314010e

Syntheses and structures of silicon analogues of cyclopropabenzenes 査読

T Tajima, K Hatano, T Sasaki, T Sasamori, N Takeda, N Tokitoh, N Takagi, S Nagase

JOURNAL OF ORGANOMETALLIC CHEMISTRY 686 ( 1-2 ) 118 - 126 2003年11月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：ELSEVIER SCIENCE SA

The reactions of an overcrowded diaryldilithiosilane, Tbt(Dip)SiLi2 (Tbt = 2,4,6-tris[bis(trimethylsilyl)methyl]phenyl; Dip = 2,6-diisopropylphenyl), with o-dibromobenzene and 1,2,4,5-tetrabromobenzene resulted in the synthesis and isolation of the first stable silacyclopropabenzene and bis(silacyclopropa)benzenes (IUPAC name is 4,8-disilatricyclo[5.1.0.0(3,5)]octa-1,3(5),6-triene), respectively. The crystallographic analyses and theoretical calculations revealed that the lengths of the juncture carbon-carbon bonds of the mono- and bis(silacyclopropa)benzenes were marginally in the range of carbon-carbon bond lengths of usual benzene rings. It is shown that this structural feature is attributable to a decrease in the strain energy of silacyclopropabenzenes relative to the corresponding cyclopropabenzenes, and the strain energy is a simple additive function of the number of the fused three-membered rings involving Si atom. (C) 2003 Elsevier B.V. All rights reserved.

DOI： 10.1016/S0022-328X(03)00446-7

Self-assembly and regioselective photodimerization of anthracene having a dendritic substituent 査読国際誌

Y Takaguchi, T Tajima, Y Yanagimoto, S Tsuboi, K Ohta, J Motoyoshiya, H Aoyama

ORGANIC LETTERS 5 ( 10 ) 1677 - 1679 2003年5月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：AMER CHEMICAL SOC

[GRAPHICS]
Thermotropic liquid crystallinity can be induced for an anthracene having a dendritic substituent. The photodimerization reaction of an anthracene moiety in the smectic phase proceeded quantitatively and regioselectively.

DOI： 10.1021/ol0343109

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