Catalyst for cyclodimerization of isoprene

Details Catalyst for cyclodimerization of isoprene Catalyst for cyclodimerization of isoprene

1979-02-16

1980-02-19

Garvin, Patrick

Compositions

Preservative agents

Anti-oxidants or chemical change inhibitants

252428, 252429R, 260439R, B01J 3122

Patent

active

041894030

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.ltoreq.O 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: 2968665 (1961-01-01), Mahler
patent: 3187062 (1965-06-01), Shechter
patent: 3290348 (1966-12-01), Mullineaux
patent: 3436431 (1969-04-01), Candlin et al.
patent: 3522321 (1970-07-01), DeYoung
patent: 3792101 (1974-02-01), Hattori et al.
Chem. Ab., 60 (1964) 11883e.
Chem. Ab., 66 (1967) 28422a.
Chem. Ab., 80 (1974) 120396g.
Chem. & Ind., May 29, 1965, pp. 946-947.

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