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Electron impact mass spectral fragmentation of chiral bisbenzoxazole, bisbenzothiazole and biscarbamide derivatives of 2,2‐dimethyl‐1,3‐dioxolane
Author(s) -
Xu Jiaxi,
Jiao Peng,
Deng Dayi,
Zhang Qihan,
Tsang Chun Wai,
Chan Albert S. C.
Publication year - 2002
Publication title -
rapid communications in mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.528
H-Index - 136
eISSN - 1097-0231
pISSN - 0951-4198
DOI - 10.1002/rcm.695
Subject(s) - dioxolane , chemistry , fragmentation (computing) , electron ionization , mass spectrum , mass spectrometry , ion , analytical chemistry (journal) , kinetic energy , ionization , medicinal chemistry , computational chemistry , stereochemistry , organic chemistry , chromatography , physics , computer science , operating system , quantum mechanics
The mass spectrometric fragmentation behaviour of five pairs of ( R,R )‐ and ( S,S )‐4,5‐bis(benzoxazol‐2‐yl)‐2,2‐dimethyl‐1,3‐dioxolane derivatives, one pair of ( R,R )‐ and ( S,S )‐4,5‐bis(benzothiazol‐2‐yl)‐2,2‐dimethyl‐1,3‐dioxolanes, and three pairs of ( R,R )‐ and ( S,S )‐ N,N ′‐bis(2‐hydroxyaryl)‐2,2‐dimethyl‐1,3‐dioxolane‐4,5‐dicarbamides, all important compounds for asymmetric catalysis (P. Jiao et al., Tetrahedron Asymmetry 2001; 12: 3081), has been studied with the aid of mass‐analyzed ion kinetic energy spectrometry and accurate mass measurements under electron impact ionization conditions. The spectral observations have been rationalized in terms of fragment ion structures and fragmentation mechanisms that will provide an aid to spectral interpretation for new compounds of this type. Copyright © 2002 John Wiley & Sons, Ltd.