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Abstract
The electron impact mass spectra of a series of o-hydroxyphenyl dialkyl phosphine oxides (1) and dialkyl o-hydroxyphenylphosphonates (2) were investigated. The principal fragmentation pathways are the cleavage of P-Csp3 bond, the McLafferty rearrangement involving P=O group and the mixed process of these two pathways for o-hydroxyphenyl dialkyl phosphine oxides, but for dialkyl o-hydroxyphenylphosphonates, the successive McLafferty rearrangements are observed to be the predominant one without the cleavage of P-Csp2 bond which occurs as a minor process in the fragmentation of compound 1.