| http://www.w3.org/ns/prov#value | - Reaction of compounds of the general formulae (III) and (IV) in which Q and Q1 have formulae (b) and (F) or (c) and (G) respectively is advantageously carried out in dimethyl sulphoxide, for example at a temperature in the range of from 30??? to 80??? C., e.g. substantially 50??? C., and advantageously for a period of time of 1 to 4 days, e.g. about 3 days.
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