| 摘要 |
Compounds of the formula: <IMAGE> wherein R represents a straight or branched C1-C5 alkyl group; and R1 in each occurrence represents an acyl member which is alkanoyl having 1-22 carbon atoms, alkenoyl having one or two double bonds and having 4-22 carbon atoms, <IMAGE> having a total of 4-10 carbon atoms of which 3-7 are ring carbon atoms in cycloalkyl and wherein n is zero, one, or two, phenoxyacetyl, naphthalenecarbonyl, pyridinecarbonyl, <IMAGE> wherein n is zero, one or two and phenyl is unsubstituted or is substituted by 1-3 alkyl having 1-4 carbon atoms, alkoxy having 1-4 carbon atoms, halo, trifluoromethyl, dialkylamino having 2-8 carbon atoms, or alkanoylamino having 1-6 carbon atoms groups; are prepared in substantial purity and yield, using as the chloride ion donor, cesium chloride (CsCl). |
