Thiones as superdipolarophiles. Rates and equilibria of nitrone cycloadditions to thioketones

Article abstract of DOI:10.1021/ja00143a008

1,3-Dipolar cycloadditions of N-methyl-C,C-diphenylnitrone (15) and N-methyl-C-phenylnitrone (16) with aliphatic thioketones are equilibrium reactions. The 1,4,2-oxathiazolidines were characterized and their dissociation constants measured by ¹