Oxidative coupling process
AssigneeImperial Chemical Industries PLC
InventorsDavid Holland, David John Milner, Hugh Wilma Boulton Reed
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Abstract
Isobutene is oxidatively coupled with vinylidene chloride by heating in the presence of palladium acetate, to give 1,1-dichloro-4-methylpenta-1,3-diene. This compound is useful as an intermediate in the production of insecticides. Any 1,1-dichloro-4-methylpenta-1,4-diene also produced is thermally isomerized to the 1,3 product.
Claims6
A process for the preparation of 1,1-dichloro-4-methyl penta-1,3-diene of formula ##STR2## which comprises oxidatively coupling isobutene with vinylidene chloride by heating them together in homogeneous liquid medium in the presence of a catalytic amount of palladium acetate at a temperature in the range 50.degree. to 150.degree. C, the ratio of isobutene to vinylidene chloride being in the range 2 to 1 to 15 to 1.
Dependencies are inferred from the claim text.