| http://www.w3.org/ns/prov#value | - The present invention relates also to a process for producing the compounds of the formula (IV) by heating a nitrile of the formula R3 CN, optionally together with a nitrile of the formula R4 CN, with bromoacetic ester and zinc in an inert organic solvent, preferably in an aromatic hydrocarbon, such as benzene, toluene or xylene.
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