Mass spectrometry of the trimethylsilyl derivatives of amino-hydroxy, dihydroxy and dicarboxydiphenyls

A mass spectrometric study of the trimethylsilyl derivatives of a group of amino-hydroxy, dihydroxy and dicarboxydiphenyls has disclosed that these compounds produce a number of intense doubly-charged ions ([M – 30]/2, 5 to 27%), for which the singly-charged ions are low or absent. The derivative of 4,4′-dicarboxydiphenyl yields five such doubly-charged ions with relative intensities ⪖ 3%. The fragmentation pathways for this compound have been studied by the formation and mass spectrometry of the trimethylsilyl-d9 derivative.