| 摘要 |
1,272,514. Unsaturated esters. SOC. DES USINES CHIMIQUES RHONE-POULENC. 26 May, 1970 [26 May, 1969], No. 25329/70. Heading C2C. Esters of saturated or unsaturated aliphatic acids and tertiary aliphatic alcohols containing a vinyl group with the ethylenic double bond between the α-# positions to the tertiary carbon atom, are prepared by heating the alcohol with a molor excess of saturated or unsaturated aliphatic acid anhydride (C 4-12 ) at a temperature and pressure to distil the acid formed and excess anhydride from the mixture, and separating the ester from the remaining alcohol by fractional distillation. The alcohol may be where R represents a saturated or unsaturated aliphatic radical (1-10 C), R 1 and R 2 represent a saturated or unsaturated aliphatic radical (1-8 C) and R 2 may be hydrogen, a R 1 and R 2 may together form a tri- or tetra-methylene ring, e.g. linalol. The anhydride may be acetic, propionic, isobutyric, valeric or isovaleric anhydride and an esterification catalyst such as an alkali metal carboxylate, phosphoric acid, para toluene sulphonic acid and zinc chloride may be present. Examples describe the preparation of linalyl acetate, isobutyrate and propionate and of 3-methyl-non-1-en-3-yl acetate. |
