prov:value
| - ents a halogen atom, e.g. bromine or iodine, and R.sup.1, R.sup.2, W and Q are as hereinbefore defined, with a compound of general formula (X), H--X'--(A).sub.p --Y, in which X' represents C.tbd.C, CH.dbd.CH orCH.dbd.CHCH.sub.2 and A, p and Y are as hereinbefore defined in the presence of a palladium catalyst (e.g. bis-triphenylphosphinepalladium (II) chloride), and optionally hydrogenating the co
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