Pcb. Page et al., DIASTEREOSELECTIVITY IN THE ADDITION OF GRIGNARD-REAGENTS TO KETONES CONTROLLED BY THE 1,3-DITHIANE 1-OXIDE ASYMMETRIC BUILDING-BLOCK, Tetrahedron, 49(45), 1993, pp. 10355-10368
2-Acyl-1,3-dithiane 1-oxides undergo diastereoselective addition of Gr
ignard reagents; the degree of selectivity observed is highly dependen
t upon the solvent and the halide counter-ion used; very high selectiv
ities have been observed under certain reaction conditions.