| http://www.w3.org/ns/prov#value | - A conversion of a compound of general formula (I), in which R5 is a hydrogen atom, into a compound of general formula (I), in which R5 is other than a hydrogen atom, preferably takes place by alkylation with a compound of the general formula R5 -Y, wherein Y is a reactive residue, for example halogen, methanesulphonyloxy or toluenesulphonyloxy, in an acid-binding medium.
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