Abstract: 13C NMR spectral data of 56 1, 3-dithianes are reported. Substituent parameters for alkyl groups at C-2. C-4, C-5, and C-6 acting at C-2, C-4, C-5, and C-6 are evaluated by multiple linear regression analysis. The dithiane parameters are qualitatively similar to those in 1, 3-dioxane and cyclohexane except for the a-axial effect ofa methyl group at C-5 which is upfield rather than downfield shifting, Also, the relative shifts of methyl substituents at C- ...
