... References. 1; GMP Giblin, NS Simpkins; J. Chem. Soc. (1987) in press. 2; Acetal (1) was readily prepared by treatment of α-bromoacetaldehyde dimethylacetal with PhSO 2 Na in DMF at 100°C. 3; M. Ochiai, T. Ukita, E. Fujita; The corresponding ethoxyvinyl sulphone has been used to prepare β-stannylvinyl sulphones and derivatives, see Tetrahedron Letters (1983), p. 4025. ...