| http://www.w3.org/ns/prov#value | - The process as recited in claim 11, wherein the catalyst is selected from the group consisting of dodecylbenzene sulphonic acid, n-hexylamine, tetramethylguanidine, carboxylates of rubidium or cesium, hydroxides of magnesium, calcium or strontium and phosphonitrile chloride catalysts of the general formula [X(PX2=N)SPX3]+[MX(v???t+1)RIII t]???, wherein X is a halogen atom, M is an element having a
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