Synthesis Reference(s) for 5-methylene-tetrahydro-furan-2-one:
Journal of the American Chemical Society, 109, p. 6385, 1987 DOI: 10.1021/ja00255a025 The Journal of Organic Chemistry, 43, p. 561, 1978 Tetrahedron Letters, 17, p. 4651, 1976 DOI: 10.1016/S0040-4039(00)93957-1