Reaction of alkylidenedinitrosylmolybdenum complexes with vinyl trisubstituted silanes and substituted acetylenes

✍ Scribed by A. Keller; R. Matusiak

• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 563 KB
• Volume: 104
• Category: Article
• ISSN: 1381-1169
• DOI: 10.1016/1381-1169(95)00150-6

✦ Synopsis

Reaction

of Mo( NO),( CHMe) (OR),( AlCl*) ( EtAlCI,) (R = Et, 0-i-Pr) with vinyl silanes (vinyltrimethoxysilane and vinyltrimethylsilane)

with substituted acetylenes (phenylacetylene and hex-2-yne) are studied. The ethylidene complex has been found to be an efficient catalyst for metathesis reaction of vinyl silanes. 1,2-Bis( trimethoxysilyl)ethene and ethylene are formed, via metathesis of vinyltrimethoxysilane, with a yield of above 80%. Similarly, the self-metathesis of vinyltrimethylsilane in the presence of this complex occurs, yielding 1,2-bis( trimethylsilyl)ethene and ethylene (yield below 20%). The latter reaction was accompanied by a dimerization leading to 1,4-bis( trimethylsilyl) butene-2 which was the prevailing product (above 30%). Trans-cisoidal poly( phenyl acetylene) with low molecular weight, as well as a polymer of hex-2-yne with high molecular weight are produced using this ethylidenemolybdenum complexes. Degradation of the poly( phenylacetylene) by cross-metathesis with vinyltrimethoxysilane was studied, too.