The Effects of the Electron-Donating Methoxy Group on the Photoisomerization of 4-Methyl-2,4,6-triaryl-4H-thiopyran-1,1-dioxides

Abstract

Syntheses and photoisomerization of the new sulfone derivatives, 4-anisyl-4-methyl-2,6-diphenyl-4H-thiopyran-1,1-dioxide and 2,6-dianisyl-4-methyl-4-phenyl-4H-thiopyran-1,1-dioxide, are described. The relative molar ratios of the regioselective photoproducts were compared with those of the unsubstituted model compound under identical experimental conditions using 1H NMR spectroscopy. The results that were observed are discussed on the basis of a vinyl-vinyl thia-di-π -methane rearrangement.