| http://www.w3.org/ns/prov#value | - Alternatively, some of the compounds of the present invention may be made by reacting the acid RCOOH with a reagent of the formula ##STR4## wherein Y is a leaving group such a halogen, methanesulfonate or p-toluenesulfonate and X, R, R1, R2, R4 and R5 are as defined herein above, in the presence of a base or with a salt of the acid, such as a silver or trialkylammonium salt.
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