摘要:
A potential boronate affinity chromatography ligand o-boronobenzalmethoxyamine (IV) and its precursor [o-formylbenzeneboronic acid (III)] were synthesized and characterized by three-dimensional single-crystal X-ray diffractometry. Both compounds contained no bonding between the boron atoms and the oxygen atoms [O(3)] of the distinguishing functional group. In addition, B-11 NMR data confirmed the lack of any coordination between the boron and oxygen atoms in the boronic acid compounds III and IV and the catachol ester derivative (V) of IV. o-Formylbenzeneboronic acid (III) crystallizes in space group P2(1)/n with a = 3.883(1), b = 13.225(1), c = 14.029(2)Angstrom, beta = 92.16(1)degrees, and four molecules per unit cell. o-Boronobenzalmethoxyamine (IV) crystallizes in space group Pccn with a = 14.158(2), b = 17.156(1), c = 7.734(2)Angstrom, and eight molecules per unit cell. Selected bend distances and angles are tabularized.