A simple preparative route to the title compounds is given involving bromine addition to α-ethoxyvinyl ketones and subsequent hydrolysis. These compounds undergo efficient photocyclisation with retention of the halogen to hydroxycyclobutanone and hydroxycyclopentanone derivatives.
N. K. Hamer, J. Chem. Soc., Perkin Trans. 1, 1983, 61 DOI: 10.1039/P19830000061
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