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