| 摘要 |
1,141,847. Selective hydrogenation. IMPERIAL CHEMICAL INDUSTRIES Ltd. 17 Aug., 1967 [24 Aug., 1966; 8 Sept., 1966], Nos. 37984/66 and 40207/66. Heading C5E. [Also in Division Bi] Selective homogenous hydrogenation of hydrocarbons containing two or more sites of unsaturation is effected by contact with hydrogen in the presence of a solution containing a soluble divalent ruthenium compound. Specified selective hydrogenation reactions are (1) hydrogenation of terminal acetylenic bonds in preference to terminal olefinic bonds e.g. hexene-1 before octene-1; (2) hydrogenation of terminal olefinic bonds in preference to cyclic olefinic bonds e.g. hexene-1 before cyclohexene; (3) hydrogenation of terminal olefinic bonds in preference to internal, non-cyclic, olefinic bonds e.g. pentene-1 before pentene-2; (4) hydrogenation of conjugated dienes in preference to straight chain and cyclic olefines e.g. cis- and trans-pentadienes before cyclopentene. In examples (1) hexene is hydrogenated in the presence of cyclohexene; (2) hexene in the presence of octene-1; (3) 4-vinyl cyclohexene is converted rapidly to ethyl cyclohexene (as opposed to vinyl cyclohexane; and (8) pentadienes are hydrogenated in the presence of pentenes-1, -2 and cyclopentene. |
