Titanocene hydride derivatives induce the cyclization of 1,2-divinylcyclohexanes to trans- and cis-1-methylene-octahydro-1H-indene and their isomerization to trans- and cis-3-methyl-3a,4,5,6,7,7a-hexahydro-1H-indene.
Adjusting the Features of Active Metallocene Ziegler Systems fot Their Potential Use as Carbon–Carbon Coupling Catalysts in Organic Synthesis
作者:Sven Thiele、Gerhard Erker
DOI:10.1002/cber.19971300210
日期:1997.2
A variety of bent metallocene dichloride/methylalumoxane catalysts, derived from the zirconocene complexes 10, 12-18, have been employed in intramolecular olefin-coupling reactions yielding monomeric or dimeric products. This was achieved by using optimized reaction conditions employing low substrate concentrations (1.0-1.8 M) and rather long reaction times. Under these particular conditions, 1,5-hexadiene