The direct anti-Markovnikov esterification of monosubstituted alkenes can be achieved in excellent, yields under very mild reaction conditions using a hydroboration-mercuration-iodination sequence. Hydroboration with "borane" and subsequent mercuration with a variety of mercuric carboxylates gives excellent yields of the corresponding primary alkylmercuric carboxylates. In situ iodination generates alkyl iodides which under the reaction conditions are rapidly transformed into primary esters. This procedure does not permit the synthesis of esters derived from very strong carboxylic acids or more highly substituted alkenes.