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In order to study the side reactions occuring during the synthesis of unsaturated polyesters, several 2‐hydroxypropyl esters were synthesized by reduction of the corresponding acetylmethyl esters 1a – i . It was found that on heating they are partly isomerized to the 1‐methyl‐2‐hydroxyethyl esters. The extent of isomerization was determined at various temperatures by NMR spectroscopy, both in solution and in bulk. An analysis of the NMR spectra is given and a mechanism of the isomerization is suggested.
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Fradet et al. (1979) studied this question.
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