ChemInform Abstract: Compounds of L(+)‐Ascorbic Acid with Metals. Part 8. Titanium(IV) Complexes of L(+)‐Ascorbic Acid and 5,6‐O‐Isopropylidene‐L‐ascorbic Acid.

Abstract

Compounds of L(+)-Ascorbic Acid with Metals.Part 8. Titanium(IV) Complexes of L(+)-Ascorbic Acid and 5,6-O-Isopropylidene-L-ascorbic Acid.-The reactions of Ti(IV) halides (I) and (VI) with alkali metal salts of L(+)-ascorbic acid and 5,6-O-isopropylidene-L-ascorbic acid such as (II), (IV), and (VII) generally result in the formation of complexes of the appropriate dianions. Whereas Asc2-exclusively forms the ate complex (III), Iasc2-forms only the neutral complexes (V) and (VIII). Spectroscopic studies show the ene-diolate group to be the coordination site for both of the dianions. However, for Iasc2-an additional weakly interaction between one of the O atoms of the dioxolane ring and Ti(IV) cannot be excluded. -(JABS, W.; GAUBE, W.; FEHL, C.; LUKOWSKI, R.; Inorg.