By R. Stuart Tipson and Derek Horton (Eds.)
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Extra resources for Advances in Carbohydrate Chemistry and Biochemistry 47
These values were obtained from the change in optical rotation of lactose on addition of these salts; the change may well be caused by factors other than complex-formation. Table IV also includes some values determined in methanol as the solvent; these are very much higher (and, hence, also more accurate) than those in water, because the polyol competes with methanol, rather than with water, for outer-sphere positions on the cation. In aqueous solution, the concentration of this complex would be neghgible.
Baker, M. Y. Tucker, S. M. Lastick, and M. E. Himmel, J. ,437 (1988) 387-397. (164) H. F. Walton, J. , 332 (1985) 203-209. (165) K. Sasaki, K. B. Hicks, and G. Nagahashi, Carbohydr. Rex. 183 (1988) 1-9. (166) S. J. Angyal, Carbohydr. Rex, 26 (1973) 271-273. COMPLEXES OF METAL CATIONS WITH CARBOHYDRATES 41 hydrogen atoms have the same chemical shift, even high-field instruments cannot resolve their signals. r. ) The spectra of D-glucuronic acid,'17 methyl P-Dtalofuranoside, and D-glucaro-1,4-la~tone'~~ have been resolved by the addition of praseodymium chloride.
Angyal, Curbohydr. , 77 (1979) 37-50. (169) D. Horton and Z. Walaszek, Curbohydr. , 105 (1982) 95- 109. (170) S. J. Angyal, G . S. Bethell, J. E. Cowley, and V. A. Pickles, Aust. J. , 29 (1976) 1239- 1247. (170a) 1. I. Cubero and M. T. P. Lbpez-Espinosa, Curbohydr. Rex, 173 (1988) 41 -52. (171) M. E. Evansand S. J. Angyal, Curbohydr. Rex, 25 (1972)43-48. 42 STEPHEN J. , 4%); methyl P-D-lyxofuranoside, 3 1% (lit. 3-5%); and methyl PD-talofuranoside, 54% (previously unknown). This increase in yield, spectacular in some cases, is due not only to the shift in the equilibrium but also to the separation, without substantial losses, of the desired component by the calcium column.