| abstract |
A process for the preparation of a compound of the general formula In is described according to which a compound of the general formula IIbn is reacted with a compound of formula IIIn in whichn L represents a leaving group, generally carrying out the reaction in the presence of a base. R' represents an alkylene, alkenylene or alkynylene group, having from 1 to 4 carbon atoms, and R 2 represents a heterocyclic group having a five-membered or 6-membered ring with 1 to 4 heteroatoms, selected from oxygen sulfur and nitrogen, and being linked to the adjacent sulphur atom via a ring carbon atom. |