C. I. Fujimoto, J. Am. Chem. Soc. 73, 1856 (1951); B. Belleau, ibid. 5441.

Synthesis of cyclic α-substituted α,β-unsaturated ketones from enol lactones and Grignard reagents prepared from primary halides:

Review: J. Weill-Raynal, Synthesis 1969, 49. Modified conditions: M. Aloui et al., Synlett. 1994, 115.