Method for the partial hydrogenation of conjugated dienes

Details Method for the partial hydrogenation of conjugated dienes Method for the partial hydrogenation of conjugated dienes

1985-02-26

1986-05-20

Davis, Curtis R.

Chemistry of hydrocarbon compounds

Adding hydrogen to unsaturated bond of hydrocarbon, i.e.,...

Partial

585271, C07C 505

Patent

active

045903190

ABSTRACT:
A method for the partial hydrogenation of conjugated dienes, characterized in that a chain conjugated diene in which the conjugated two double bonds have different numbers of substituents, is hydrogenated at a temperature of not higher than 50.degree. C. in the presence of a catalyst composed essentially of (1) a cobalt compound, (2) an organophosphine compound and (3) an aluminum compound, to obtain a partially hydrogenated product wherein as between said conjugated two double bonds, the one having a greater number of substituents is selectively hydrogenated.

REFERENCES:
patent: 3715405 (1973-02-01), Misono et al.
patent: 3937745 (1976-02-01), Wideman et al.
Iwamoto, Masao, Chemical Abstracts, Dec. 7, 1970, vol. 73, No. 23, Abstract 1200496, pp. 329-330.
Kiyoshi Kawakami et al, Chemistry Letters, 1976, pp. 847-848.
Takuzo Funabiki et al, Bulletin of the Chemical Society of Japan, 1972, vol. 45, pp. 2723-2730.
Hiroshi Itatani et al, Product R & D, Selective Transition Metal Catalysts Complexed with Triphenyl Phosphine, 1972, vol. 11, No. 2, pp. 146-155.

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