| 摘要 |
1,168,774. Dimerization of α,#-unsaturated compounds. IMPERIAL CHEMICAL INDUSTRIES Ltd. 24 Jan., 1967 [18 Feb., 1966], No. 7277/66. Heading C2C. Nitrile, ester or amide derivatives of α,#-unsaturated carboxylic acids are dimerized in the presence of a catalyst which is a cyclic tertiary amine having at least one nitrogen atom common to two or three rings. The reaction may be effected in a solvent, e.g. alcohols, dimethylformamide or benzene, at a temperature between ambient and 250‹ C., optionally under pressure or in the presence of an inert gas. The amines may be employed in an amount of 1-25% by wt. based on the unsaturated corepound, specified amines being triethylenediamine, quinuclidine and pyrrocoline. In examples, acrylonitrile is dimerized to 1,3-dicyanobut-3-ene. |
