Polyol metal complexes part 36 - A combined X-ray and NMR study of borate esters of furanoidic cis-1,2-diols

Crystals of K[B(AnErytH(-2))(2)]. 2 H2O (AnEryt = 1,4-anhydroerythritol) fo rm from aqueous alkaline solutions containing a double molar amount of diol over berate. The spiro-type monoanions are the main berate species in the mother liquors of crystallisation according to B-11 and C-13 NMR spectrosco py. Ribofuranosides form analogous berate esters using their 1,4-anhydroery thritol core. Crystals of Na[B(Me beta-D-Ribf 2,3H(-2))(2)]. 2 H2O were gro wn from alkaline methyl beta-D-ribofuranoside solutions that had attacked b oron-containing Duran vessels. NMR spectra show closely resembling borate-e ster speciation in solutions of diols with the 1,4-anhydroerythritol core - 1,4-anhydroerythritol itself, methyl beta-D-ribofuranoside and guanosine. (C) 2000 Published by Elsevier Science Ltd. All rights reserved.