The mass spectra of 17 hydroxythiophens and thiolactones are reported and discussed. These compounds fragment in a well-defined manner upon electron impact. In particular, the operation of an ortho effect between adjacent OH and CO2R substituents facilitates substituent location on the thiophen nucleus.
R. Grigg, H. J. Jakobsen, S.-O. Lawesson, M. V. Sargent, G. Schroll and D. H. Williams, J. Chem. Soc. B, 1966, 331 DOI: 10.1039/J29660000331
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