prov:value
| - onyl, aryl lower alkyl or C.sub.5 or C.sub.6 cycloalkyl and R.sup.C is selected from hydrogen, lower alkyl e.g. methyl or ethyl,phenyl, substituted phenyl e.g. halo, lower alkyl, lower alkoxy, nitro, amino or lower alkylamino phenyl, aryl lower alkyl or C.sub.5 or C.sub.6 cycloalkyl.SULPHUR NUCLEOPHILESExamples of "sulphur nucleophiles" include thiourea and aliphatic, aromatic, araliphatic, alicyc
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