Tetra(2-thienyl)butatrienes: new butatriene derivatives with highly amphoteric multistage redox properties and a short central double bond
作者:Takeshi Kawase、Seiji Muro、Hiroyuki Kurata、Masaji Oda
DOI:10.1039/c39920000778
日期:——
Tetra(2-thienyl)butatrienes 2a–c show highlyamphotericredoxproperties; an X-ray structure of the tetrakistrimethylsilyl derivative 2b reveals a shortbond length for the centraldoublebond.
Synthesis of 5,6,17,18-Bisdehydrotetrathia[24]annulene[2.2.2.2]. A Strained Planar Annulene Devoid of Peripheral Conjugation
作者:Takeshi Kawase、Hossein Reza Darabi、Rika Uchimiya、Masaji Oda
DOI:10.1246/cl.1995.499
日期:1995.7
5,6,17,18-Bisdehydrotetrathia[24]annulene[2.2.2.2], synthesized through a sequence of the McMurry coupling of 1,1-dichloro-2,2-di(5-formyl-2-thienyl)ethene and a novel double Fritsch-Buttenberg-Wiechell rearrangement, has a planar X-ray structure with bent triple bonds and short S-S contacts but shows little sign of peripheral conjugation.
5,6,17,18-双脱氢四硫杂[24]蒽[2.2.2.2]是通过 1,1-二氯-2,2-二(5-甲酰基-2-噻吩基)乙烯的麦克马里偶联和新型双弗里奇-布滕伯格-维切尔重排顺序合成的,具有平面 X 射线结构,三键弯曲,S-S 接点短,但几乎没有外围共轭的迹象。
Peter, Chemische Berichte, 1884, vol. 17, p. 1345
作者:Peter
DOI:——
日期:——
A Facile and High Yielding Synthesis of Symmetrical and Unsymmetrical Diarylalkynes Using Diethyl Dichloromethylphosphonate as Precursor
1,1,4,4-Tetra(2-furyl, 2-thienyl, and 2-selenienyl)butatrienes: Synthesis, Properties, and Molecular Structures
作者:Hiroyuki Kurata、Seiji Muro、Tetsuya Enomoto、Takeshi Kawase、Masaji Oda
DOI:10.1246/bcsj.80.349
日期:2007.1.15
Tetra(2-furyl, 2-thienyl, and 2-selenienyl)butatrienes and their derivatives have been prepared by dimerization of ate-type complexes derived from the corresponding 1,1-dichloro-2,2-diarylethenes using appropriate copper complexes in moderate to high yields. These new butatrienes are relatively stable crystalline substances with intense absorption bands at long wavelengths. The electronic properties of the substituents at the 5-position of aryl groups remarkably influence the wavelength of the longest absorption and the π-electron distribution of butatriene moiety. Their redox potentials, measured by cyclic voltammetry, have higher amphoteric redox properties than those of tetraphenylbutatriene. The crystal structures of tetrakis(5-trimethylsilyl)-substituted derivatives show the following two features: (1) the thiophene and selenole derivatives have pseudo-D2 structures, while the furan derivative has a C2 symmetric structure probably due to the counterbalance between the energy of conjugation and the nonbonded chalcogen–chalcogen interaction; (2) the central double bonds of these butatrienes are considerably short.