(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.
A. N. Bovin, A. N. Yarkevich, A. V. Kharitonov and E. N. Tsvetkov, J. Chem. Soc., Chem. Commun., 1994, 973 DOI: 10.1039/C39940000973
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