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- W2140993852 abstract "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 was cyclodimerized to give 1-methylene-3-(cyclopentylmethyl)cyclopentane (11). 1,6-Heptadiene was cleanly converted to methylenecyclohexane, and cis-1,2-divinylcyclopentane (19) and cis-1,2-divinylcylohenxane (22) were cyclized to yield 2-methylenebicyclo[3.3.0]octane (20) and 7-methylenebicyclo[4.3.0]nonane (23), respectively. In many cases, the cyclization products were accompanied by isomers originating from double-bond shift reactions that often occur rapidly at these catalyst systems under the specific reaction conditions chosen to keep the products in the monomeric regime." @default.
- W2140993852 created "2016-06-24" @default.
- W2140993852 creator A5016972484 @default.
- W2140993852 creator A5034807035 @default.
- W2140993852 date "1997-02-01" @default.
- W2140993852 modified "2023-10-17" @default.
- W2140993852 title "Adjusting the Features of Active Metallocene Ziegler Systems fot Their Potential Use as Carbon–Carbon Coupling Catalysts in Organic Synthesis" @default.
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- W2140993852 doi "https://doi.org/10.1002/cber.19971300210" @default.
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