Besides yielding 3-ethyl-3-hydroxypentan-2-one (2) and 3-ethylpentan-2-one (4), 3-ethylpentane-2,3-diol (1) is transformed on copper catalysts into 4-methyl-4-hydroxyhexan-3-one (3) and 4-methylhexan-3-one (5), via 1,2-ethyl migration, this being the first experimental observation of 1,2-bond shift isomerization on copper.
M. Bartók and Á. Molnár, J. Chem. Soc., Chem. Commun., 1980, 1178 DOI: 10.1039/C39800001178
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