Abstract
Novel S, O, N-triheterocation, N-(1, 3-oxathiol-2-ylidene) ternary iminium ion (II), was synthesized by cyclization of phenacyl l-piperidinecarbothiolate with concentrated sulfuric acid. A number of derivatives having various substituents at para position of 5-phenyl group in II were prepared. Physicochemical properties examined in these salts revealed that the immonium structure is more substantial than the 1, 3-oxathiolium structure.
