Modes of xanthine complexation to dirhodium tetrakis[(R)-α-methoxy-α-(trifluoromethyl)-phenylacetate] in solution and in the solid state

Article abstract of DOI:10.1515/znb-2001-0317

It is shown by IR and NMR studies that the xanthines 1-5 prefer a side-on complexation to the chiral dirhodium tetrakis[(R)-α-methoxy-a-(trifluoromethyl)phenylacetate] (Rh*) in solution whereas carbonyl groups are involved in the solid state. For 6, at le