(2-Hydroxyphenylmethylene)bis(phosphine oxides): a facile rearrangement into 2-(phosphinylmethyl)phenyl phosphinates
Abstract
(2-Hydroxyphenylmethylene)bis(phosphine oxides)3 prepared from 2-(diphenylphosphinylmethyl)phenyl phosphinates 2 by oxygen-to-carbon 1,4-phosphinyl migration easily rearrange back into a mixture of 2-(phosphinylmethyl)phenyl phosphinates 2 and 4 under basic conditions or upon heating.