| http://www.w3.org/ns/prov#value | - .1-3 -alkyl group, with a compound of general formulawherein R.sub.a ' denotes a carboxy-C.sub.1-4 -alkyl or tetrazolyl-C.sub.1-4 -alkyl group and Z.sub.7 denotes a nucleofugic leaving group such as a halogen atom or a sulphonic acid ester group, e.g. a chlorine, bromine or iodine atom, or ap-nitrophenyl group.The alkylation is conveniently carried out in a solvent such as methylene chloride, tet
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