The complete proton and carbon chemical shift assignments have been ma
de for 2- and 3-formylphenoxathiin, 2- and 3-formyl-phenoxathiinsulfon
e, 2- and 3-acetylphenoxathiin, 2- and 3-methyl-phenoxathiin. In some
cases the assignments were made with the aid of II,II-COSY and C,II-CO
SY experiments. The analysis suggests that transmission of substituent
effects from 3-position (para to sulfur) to the unsubstituted ring ta
kes place via a pi-polarization mechanism operating through the sulfur
atom. If the substituents are fixed in 2-position (meta to sulfur) th
e influence on the unsubstituted ring is small.