| abstract |
1,256,357. Dimerizing dienes. MITSUBISHI CHEMICAL INDUSTRIES Ltd. 8 Nov., 1968 [10 Nov., 1967; 25 Jan., 1968; 30 March, 1968; 3 April, 1968; 8 April, 1968; 8 June, 1968; 18 Sept., 1968], No. 52926/68. Heading C5E. [Also in Division C2] Conjugated dienes are dimerized in the presence of a catalyst comprising (a) an organic palladium compound having a bivalent palladium atom, particularly palladium acetate, propionate, benzoate or acetylacetonate; and (b) a mono- or ditertiary phosphine or arsine, particularly triphenyl phosphine or arsine or tri-n-butyl phosphine. In examples, the main hydrocarbon product starting from butadiene is n-octatriene-1,3,7 with some 4-vinyl-cyclohexene-1. In most of the examples the reactants include an active hydrogen-containing compound and the products include the adduct thereof with butadiene dimer (see Division C2). |