| http://www.w3.org/ns/prov#value | - , operating in an inert solvent which may be, for instance, dioxane, dimethoxyethane, water, methanol or ethanol at a temperature between about 0??? C. and about 50??? C. The acylation of a compound of formula (I) wherein R is --OH or, respectively, --SH, in order to obtain a compound of formula (I) wherein R is a group --OR5 or, respectively, a group --SR7 wherein R5 and, respectively, R7 are a g
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