Abstract: Alkoxymalonic esters are useful reagents in organic syntheses, but most, of the methods for their preparation found in the literatures[1-7] are of restricted applications, and in some of these methods the yields are unsatisfactory, the starting materials are not readily available, or the procedures for preparation are somewhat tedious. In order to improve such a situation, a general applicable new method with a good yield (mostly over 75%) has been proposed. The reaction is carried out with an alcohol ROH (or a phenol) and an alkyl (R') bromomalonate in the presence of triethylamine where R' should be equal to Rfor preventing transesterification and mixed alkoxylation. But ethyl bromomalonate is quite feasible in the preparation of phenoxymalonate because transesterification product has not been isolated.

Key words: Alkoxymalonic esters, Bromomalonic esters, Triethylamine, Preparation