| http://www.w3.org/ns/prov#value | - Also within the present invention is a process for the preparation of the compounds of formula (I), characterized in that a substituted ??-halogenated compound, preferably ??-brominated or ??-chlorinated, of formula (II) ##STR7## in which R1, R2, R3, Hal and R4 are as defined for (I), is reacted
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