Cyclodimerization of isoprene

Details Cyclodimerization of isoprene Cyclodimerization of isoprene

1978-01-16

1979-08-28

O'Keefe, Veronica

Chemistry of hydrocarbon compounds

Alicyclic compound synthesis

From nonring hydrocarbon

585366, 585370, C07C 321, C07C 3035

Patent

active

041660765

ABSTRACT:
1,5-Dimethyl-1,5-cyclooctadiene and 1,4-dimethyl-4-vinyl-1-cyclohexene are prepared by contacting isoprene with a catalyst obtained by mixing a nickel compound, a reducing agent capable of reducing the nickel to zerovalent nickel, and a trihydrocarbyl phosphite, arsenite or antimonite wherein at least one of the three hydrocarbyl groups is a substituted hydrocarbyl group CF.sub.3 --(CF.sub.2).sub.n C(H)(R)--, in which n.gtoreq.0 and R is an optionally substituted hydrocarbyl group. Only very small amounts of the undesired 1,6-dimethyl-1,5-cyclooctadiene are formed.

REFERENCES:
patent: 3187062 (1965-06-01), Shechter
patent: 3792101 (1974-02-01), Hattori et al.
Chem. Ab. 80:120396g, 1974.

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