2-[Bis(methoxycarbonyl)methylene]-3-phenyl-1,3-thiazolidine

Regioselective synthesis, structure and behavior in solutions of novel phosphorylated thiazolidin‐4‐ones

“…The nature of the such X S· · ·O contacts is usually explained in terms of the charge transfer from the oxygen lone pair (Lp O ) to the antibonding orbital of the X S bond ( * X S ) [12,13] which is in line with the specific direction of this contact in 3a [C(2)S(1)O (5) is 164.8 (2) • ]. However, the S(1)· · ·O(5) contact (2.800(2)Å) in 3a-E,Z is significantly elongated in comparison with the ones in nonphosphorylated thiazolidin-4-one derivatives (2.613-2.696Å) known in the literature [11,[14][15][16]. Thus, the possibility that the S· · ·O contact in 3a-E,Z may be forced by its nature rather than caused by the charge transfer must not be ruled out.…”