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Mass spectra of esters of α‐hydroxy and α‐methoxy acids
Author(s) -
Goulden J. D. S.,
Manning D. J.
Publication year - 1970
Publication title -
organic mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.475
H-Index - 121
eISSN - 1096-9888
pISSN - 0030-493X
DOI - 10.1002/oms.1210031116
Subject(s) - mass spectrum , chemistry , formaldehyde , electron ionization , ion , medicinal chemistry , spectral line , hydrogen , stereochemistry , physics , organic chemistry , ionization , astronomy
The most abundant fragment produced by electron bombardment of esters of the type R 1 R 2 C(OR 3 )CO 2 R 4 is the R 1 R 2 C = \documentclass{article}\pagestyle{empty}\begin{document}$ \mathop {\rm O}\limits^{{\rm + } \cdot } $\end{document} R 3 ion. Methyl glycollate (R 1 = R 2 = R 3 = H, R 4 = Me) eliminates the HCO˙ radical by a complex rearrangement involving the methylenic hydrogen atoms. The methyl and ethyl esters of methoxyacetic acid (R 1 = R 2 = H, R 3 = Me, R 4 = Me or Et) eliminate formaldehyde by the McLafferty rearrangement.