A combined X-ray and NMR study of borate esters of furanoidic cis-1,2-diols.
Crystals of K[B(AnErytH(-2)2] x 2 H2O (AnEryt = 1,4-anhydroerythritol) form from aqueous alkaline solutions containing a double molar amount of diol over borate. The spiro-type monoanions are the main borate species in the mother liquors of crystallisation according to 11B and 13C NMR spectroscopy. Ribofuranosides form analogous borate esters using their 1,4-anhydroerythritol core. Crystals of Na[B(Me beta-D-Ribf 2,3H(-2))2] x 2 H2O were grown from alkaline methyl beta-D-ribofuranoside solutions that had attacked boron-containing Duran vessels. NMR spectra show closely resembling borate-ester speciation in solutions of diols with the 1,4-anhydroerythritol core--1,4-anhydroerythritol itself, methyl beta-D-ribofuranoside and guanosine.
Benner
K
K
Institut für Anorganische Chemie der Universität, Karlsruhe, Germany.
Klüfers
P
P
D001881:Borates / Q000138:chemical synthesis* / Q000737:chemistry*; D001895:Boron; D002236:Carbohydrate Conformation; D002247:Carbon Isotopes; D018360:Crystallography, X-Ray; D004896:Erythritol / Q000031:analogs & derivatives* / Q000138:chemical synthesis / Q000737:chemistry; D004952:Esters / Q000138:chemical synthesis; D009682:Magnetic Resonance Spectroscopy / Q000379:methods; D008958:Models, Molecular; D008968:Molecular Conformation; D012996:Solutions
D001881:Borates; D002247:Carbon Isotopes; D004952:Esters; D012996:Solutions; C416840:bis(meso-oxolanediolato)borate; D001895:Boron; D004896:Erythritol