| http://www.w3.org/ns/prov#value | - C, in the presence of an alkaline hydroxide such as sodium hydroxide and optionally in the presence of a polar solvent such as wateror aqueous ethanol.The intermediate compounds of formula XIX may be prepared by a Friedel Crafts reaction between a compound of formula XX ##STR18## wherein Hal is a halogen atom and X and Z.sup.2 have the meaning given in formulae XIX and I respectively, with acompou
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