Synthesis of substituted dibenzophospholes. Part 9. Preparation of two water-soluble phosphinic–polyphosphonic acids
作者:John Cornforth
DOI:10.1039/p19960002889
日期:——
Several improvements, including a generally applicable method for reduction of aromatic nitro compounds to amines, were made to the preparation from 2,2′,4,4′-tetranitrobiphenyl of the meso atropisomer 1 of a bis-phosphonomethylated 4,6-diaryldibenzophosphole 5-oxide, previously obtained in impure form. A concomitant product 12 containing one phosphonomethyl group was formed by a novel intramolecular
从双膦酰基甲基化的4,6-二芳基二苯并膦5的内消旋异构体1的2,2',4,4'-四硝基联苯的制备方法进行了几处改进,包括将芳香族硝基化合物还原为胺的通用方法-氧化物,以前以不纯形式获得。通过新颖的分子内置换形成了含有一个膦酰基甲基的伴随产物12。两种产物均通过专门开发的方法转化为分别包含四个和三个膦酰基甲基的次膦酸-多膦酸结晶,可在pH值为2-4的水中形成稳定的单分散溶液。这些溶液催化了2-甲基丙烯的水合成叔酸丁醇比同等酸度的甲苯-4-磺酸溶液更有效。