COMPOUNDS OF L(+)-ASCORBIC ACID WITH DIMETHYLTHALLIUM(III), DIMETHYLTIN(IV), AND DIBUTYLTIN(IV) - SYNTHESIS, SOLID-STATE SPECTROSCOPY (CP/MAS C-13 NMR AND IR), AND MULTI-NMR BEHAVIOR IN AQUEOUS SOLUTION

摘要

Reaction of L(+)-ascorbic acid (H(2)Asc) with TlMe(2)OOCCH(3), SnMe(2)O, and SnBu(2)Cl(2) (in this last case, in the presence of Et(3)N) afforded [TlMe(2)(HAsc)].1/2 C3H8O, [SnMe(2)(Asc)], and [SnBu(2)(Asc)], respectively. The new compounds were studied in the solid state by CP/MAS C-13 NMR and IR spectroscopy, and in aqueous solution by H-1,C-13, Tl-205, and Sn-119 Sn NMR spec troscopy. The thallium compound behaves as a salt. In the tin derivatives, the metal appears to interact with the (AsC)(2-) anion through the O(1), O(2), and O(3) atoms of the lactone ring. Other possible weak interactions of the tin complexes in the solid state are also discussed. [References: 19]