| 摘要 |
The selective hydrogenation of olefinic compounds containing a vinyl group in the presence of an olefinic compound not containing a vinyl group is effected with hydrogen in the presence of a ruthenium catalyst. Suitable conditions are 0 DEG -200 DEG C. and subatmospheric-2,000 p.s.i.g. pressure, and generally the reaction is effected in the presence of 1-99% (based on the olefines) of water. The catalyst may be a sponge or supported on carbon, alumina, kieselguhr or diatomaceous earth. Sufficient hydrogen is added to hydrogenate the vinyl compound. The olefinic compounds may contain hydrocarbon or non-hydrocarbon groups which do not react under the conditions employed, e.g. alkyl, aralkyl, aryl, heterocyclic, hydroxyalkyl or ester. The process may be used to effect separation of close boiling isomeric olefinic compounds. The following selective hydrogenations are specified, in each pair of named compounds the first named is hydrogenated while the bracketed compound is unchanged:-1-octene (2-octene); 1-octene (cyclohexene); 4-methyl-1-pentene (cyclohexene); 4-methyl-1-pentene (2-octene); 1 - octene (2-methyl-1-pentene); 3 - methyl - 1 - pentene (2-methyl-1-pentene); 1-octene (2-methyl-2-pentene); 4-methyl-1-pentene (2-methyl-2-pentene); allyl benzene (a -methyl styrene); vinyl cyclohexane (1,2-dicyclohexylethylene); 3-vinylpyridine (1-(3-pyridyl)-propene); 1-buten-4-ol (2-methyl-1-buten-4-ol); acrylic acid (crotonic acid). |
