Organoboron compounds. Part VIII. Aliphatic and aromatic diboronic acids
作者:I. G. C. Coutts、H. R. Goldschmid、O. C. Musgrave
DOI:10.1039/j39700000488
日期:——
Diboronic acids (HO)2B·R·B(OH)2(where R = polymethylene, arylene, or thiophen-2,5-diyl) are prepared by reactions of methyl borate with difunctional Grignard reagents and are characterised by the formation of cyclic esters with various diols. The polymethylenediboronic acids are much more resistant to aerial oxidation than are the corresponding alkylboronic acids. All the diboronic acids undergo dehydration
二硼酸(HO)2 B·R·B(OH)2(其中R =聚亚甲基,亚芳基或噻吩-2,5-二基)是通过硼酸甲酯与双功能格氏试剂反应制备的,其特征在于与各种二醇的环酯。聚亚甲基二硼酸比相应的烷基硼酸更耐空气氧化。所有的二硼酸都经过脱水反应生成相应的聚合酸酐,其中芳族化合物的温度要求> 230°。描述了导致脱硼或形成胺络合物的反应。噻吩-2,5-二基二硼酸经阮内镍处理后进行氢解,得到四亚甲基二硼酸。