1. Approach to a metallacycling polymerization — reactions of [(η5-C5H5)Co(PPh3)2] with α,β-diynes and Me3SiCCC6H4C6H4CCSiMe3
- Author
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Hidehiro Uekusa, Shigeru Ohba, Ta i. Shimura, Akira Ohkubo, Toyoaki Fujita, Hiroshi Nishihara, and Kunitsugu Aramaki
- Subjects
chemistry.chemical_classification ,Polymer ,Conjugated system ,Inorganic Chemistry ,chemistry.chemical_compound ,chemistry ,Polymerization ,Product (mathematics) ,Polymer chemistry ,Materials Chemistry ,Organic chemistry ,Cyclobutadiene ,Physical and Theoretical Chemistry ,Cyclic voltammetry ,Cis–trans isomerism - Abstract
Reactions of [CpCo(PPh3)2](Cp=η5-cyclopentadienyl) with conjugated diacetylenes were investigated in terms of the synthesis of π-conjugated organometallic polymers. The reaction of an α,β-diyne, PhCCCCPh, gave three geometric isomers of dialkynylcobaltacyclopentadienes, 1a-c, and an insoluble polymeric product, 1d. A 2,4-dialkynyl complex, 2, and a 2,5-dialkynyl complex, 3, were obtained solely from Me3SiCCCCSiMe3 and MeCCCCMe, respectively. 1,1′-Bis(trimethylsilylethynyl)-4,4′-biphenyl afforded two isomers of 1,3-dialkynylcyclobutadiene complexes, 4a and 4b. The stability of the one-electron oxidized forms of the cobalacyclopentadiene and cyclobutadiene complexes was examined by cyclic voltammetry.
- Published
- 1995
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