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Are thiocarbonyl ylides of type (1) stabilized by participation of structure (2) in the ground state?(3), X[DOUBLE BOND]CN, Y[DOUBLE BOND]H, and (4), X[DOUBLE BOND]H, Y[DOUBLE BOND]CN, form stable crystals; 13C- and 1H-NMR spectra suggest localized negative charge and partial double bond character of the (C-1′)[BOND]S bond.