| 摘要 |
1,146,791. Vinyl esters. DENKI KAGAKU KOGYO K.K. 15 June, 1967 [21 June, 1966; 30 Dec., 1966], No. 27588/67. Heading C2C. Vinyl esters are prepared by reacting an olefine with a carboxylic acid (A) in the liquid phase in the presence of (1) molecular oxygen, (2) a platinum group metal or compound thereof as catalyst with (3) a vanadyl salt as promotor. The vanadyl salt is soluble in the reaction mixture and is derived from an acid with a dissociation constant greater than that of the carboxylic acid (A). The carboxylic acid (A) may be acetic, propionic, or butyric acid and the vanadyl salt is then a salt of mono-, di- or trifluoro acetic acid, mono-, di-, or trichloroacetic acid, or organic sulphonic acid, phosphoric acid or a hydrohalide acid, and if acid (A) is propionic or butyric acid a vanadyl salt of formic, phthalic or maleic acid is used. Ethylene, propylene, butylene, butadiene are olefines mentioned and platinum, palladium, rhodium, ruthenium, osmium and iridium on conventional supports may be the catalyst. The vanadyl salts may be prepared in situ. Examples describe the preparation of vinyl acetate using vanadyl monochloride, dichloride, trichloride, paratoluene sulphonate, trifluoroacetate, methane sulphonate and maleate as promoters. |
