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Gas‐phase ion–molecule reactions in organophosphorus esters
Author(s) -
Gal JeanFrancois,
Herreros Marta,
Maria Pierre Charles,
Operti Lorenza,
Pettigiani Claudio,
Rabezzana Roberto,
Vaglio Gian Angelo
Publication year - 1999
Publication title -
journal of mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.475
H-Index - 121
eISSN - 1096-9888
pISSN - 1076-5174
DOI - 10.1002/(sici)1096-9888(199912)34:12<1296::aid-jms883>3.0.co;2-z
Subject(s) - chemistry , trimethyl phosphate , trimethyl phosphite , phosphonate , mass spectrometry , adduct , molecule , phosphate , ion , fragmentation (computing) , fourier transform ion cyclotron resonance , polyatomic ion , ion cyclotron resonance , medicinal chemistry , inorganic chemistry , organic chemistry , chromatography , cyclotron , computer science , operating system
Abstract Self‐condensation ion–molecule reactions of trimethyl phosphite, triethyl phosphite, dimethyl phosphonate, trimethyl phosphate and 2,2‐dichlorovinyl dimethyl phosphate (dichlorvos) were investigated by ion trap mass spectrometry and Fourier transform ion cyclotron resonance mass spectrometry. Reaction paths for the main processes observed were elucidated by parent ion selection and for reaction times up to 500 ms. In parallel, high‐resolution measurements were performed in order to determine the composition of the principal ions. Among the compounds under examination, trimethyl phosphite and triethyl phosphite mainly give [M + H] + and [M + (RO) 2 P] + (R = CH 3 , C 2 H 5 ) adduct ions, whereas trimethyl phosphate and dimethyl phosphonate display [2M + H] + ions, as the only abundant products, formed by reaction of [M + H] + and M. 2,2‐Dichlorovinyl dimethyl phosphate mostly shows fragmentation processes. The reaction patterns of the compounds examined were related to their different structural features. Gas‐phase basicities of the phosphoryl compounds were also determined or re‐examined. Copyright © 1999 John Wiley & Sons, Ltd.