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The dipole moments of some a : /3-and / 3 : y-unsaturated sulphones have been determined experimentally. The moments of the a : Bunsaturated sulphones are only slightly higher than those of the corresponding , ! ? : y-unsaturated sulphones. It is suggested that there is no conjugative interaction of the sulphonyl and ethenyl groups in the ground states of cc : /3-unsaturated sulphones. The data are interpreted in terms of the inductive effect of the sulphonyl group.