Ultraviolet irradiation of syn-5-hydroxymethyl-4, anti-5-dimethyltricyclo[2.2.1.02,6]heptan-3-one 4 in benzene or methanol gives the ring-expanded cyclic acetal 5 in high yield, establishing that the reaction proceeds via an oxacarbene intermediate.
K. Switlak, D. He and P. Yates, J. Chem. Soc., Perkin Trans. 1, 1992, 2579 DOI: 10.1039/P19920002579
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