with benzaldehyde were studied in water in heterogeneous phase in the presence and absence of anionic and cationicsurfactants such as SLS, CTACl, (CTA)2SO4 and CTAOH. All the reactions occur with excellent yields. The cationicsurfactants favour the reaction and the comparison with the corresponding tetrabutylammonium salts show that the micellar catalysis is effective mainly towards the dehydration