| 摘要 |
Partial hydrogenation (i.e. conversion of triple to double bond) of acetylene compounds (with or without a solvent) is catalysed by palladium which has been treated with an aqueous or organic solution of a salt of zinc, cadmium, mercury, gallium, indium or thallium, or mixtures thereof; the catalyst may be applied to a carrier such as calcium or barium carbonate, barium sulphate, active carbon or silica gel. The hydrogenation process is preferably carried out in presence of an amine, which term includes ammonia, aliphatic amines (e.g. methylamine), pyridine, quinoline and piperidine. Numerous metal compounds are mentioned, those specified in examples being zinc, cadmium and mercuric acetates; and thallic chlorides. In examples, almost 100% yield is generally obtained of compounds containing a double bond in place of the triple bond in the following:-2:6-dimethyloctene-2-ine-7-ol-6, butine-2-diol-1:4, 2-methylbutine-3-ol-2, 3-piperidinobutine-1, 1-ethinylcyclohexene - 1, propargyl alcohol, ethinyl-beta-ionol (obtained by reaction of beta-ionone with acetylene) and isopropenyl acetylene. Specification 804,788 is referred to.ALSO:Partial hydrogenation (i.e. conversion of triple to double bond) of acetylene compounds (with or without a solvent) is catalysed by palladium which has been treated with an aqueous or organic solution of a salt of zinc, cadmium, mercury, gallium, indium or thallium, or mixtures thereof; the catalyst may be applied to a carrier such as calcium or barium carbonate, barium sulphate, active carbon or silica gel. The hydrogenation process is preferably carried out in presence of an amine, which term includes ammonia, aliphatic amines (e.g. methylamine), pyridine, quinoline and piperidine. Numerous metal compounds are mentioned, those specified in examples being zinc, cadmium and mercuric acetates; and thallic chloride. Specification 804,788 is referred to. |
