Abstract

Abstract The mass spectral fragmentation behavior of pyridine carboxylic acid and thioacid methyl esters shows several peculiarities not observed with other aromatic esters, viz., i.a., (a) COOCH3 groups in α-position are involved in rearrangement processes under participation of N; (b) neighboring COOCH3 groups fragment by ortho-effects; (c) COSCH3, CSOCH3 and CSSCH3 groups suffer complex rearrangements leading to, e.g. loss of CO, CH2CO or S2 from M+, especially when located in α-position.

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