Journal of the Chemical Society. Perkin transactions I p. 2889 - 2893 (1996)
Update date:2022-07-30
Topics:
Cornforth, John
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.2 A concomitant product 12 containing one phosphonomethyl group was formed by a novel intramolecular displacement. Both products were converted by a specially developed method3 into crystalline phosphinic-polyphosphonic acids, containing respectively four and three phosphonomethyl groups, which formed stable monodisperse solutions in water at pH 2-4. These solutions catalysed the hydration of 2-methylpropene to fert-butyl alcohol somewhat more efficiently than a toluene-4-sulfonic acid solution of equivalent acidity.
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