. . . "Intermediates of formula (4) in which X is --CH2 --, may be prepared by reaction of a compound of formula (6): ##STR7## with an acid halide R2 COHal in the presence of a catalyst such as aluminium chloride followed by reduction using zinc and an inorganic acid such as hydrochloric acid, or hyrazine and a base such as an alkali metal hydroxide, e.g. sodium hydroxide." .