| http://www.w3.org/ns/prov#value | - A compound of the formula acid wherein R, R and R are as previously described, is treated with freshly prepared N-halo-succinimide and pyridine in the presence of an inert organic solvent, for example, a hydrocarbon such as benzene or the like, and this reaction mixture is treated with a dialkylmalonate in the presence of an alkaline carbonate such as potassium carbonate, to yield a compound of th
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