Patent ID: 7262326

Claim:
A process of manufacturing a compound of the formula: wherein R 1 is hydrogen, alkyl, aryl, or acyl; R 3 is either R 2 or R′ 2 ; X is halo, alkyl or alkoxy; m is from 0 to 3; and b is 1 or 2, comprising: (a) reacting a compound of the formula: wherein R 1 , X, m and b are as defined above, with an organic anhydride of the formula: wherein R 2 and R′ 2 are each the same or different and are hydrogen, alkyl, aryl, or alkylaryl, wherein the alkyl, aryl or alkylaryl are unsubstituted or halo substituted, in the presence of a solvent to form a compound of the formula: (b) reacting the product of step (a) with hydrogen in the presence of a catalyst and of an organic anhydride as defined in (a) to form the above desired product.