Structure and bonding in 9‐hydroxy‐1,4‐dimethylthioxanthenium bis(carbomethoxy)methylide and related ylides

Abstract

Abstract The single‐crystal X‐ray structures of 9‐hydroxy‐1,4‐dimethylthioxanthenium bis(carbomethoxy)methylide and 1,4‐oxathianium bis(carbomethoxy)methylide are reported. The methylide carbon of the former is pseudo‐axial while that of the latter is equatorial. The former exhibits a strong intramolecular hydrogen bond to a carbonyl oxygen atom.