Alkoxide is used as an agent and consumed in condensation reactions, e.g., in the production of acetoacetic ester. Working in an alcoholic medium and starting from a salt, it is possible to produce an alkoxide by means of electrodialysis. This principle was applied successfully for the production of acetoacetic ester and the recovery of the alkoxide in a single step. Such a process would offer self-sufficiency; the alkoxide could be recovered, thus foregoing the use of mineral acids and the consequent production of a salt as a waste. The merits can be seen in an economical as well as in an ecological context.