Schmit, C., Sahraouitaleb, S., Differding, E., Dehassedelombaert, CG., & Ghosez, L. (1984). Vicinal Alkylation of Alkynes - a Short Route Toward Delta-alpha,Beta Butenolides, Furans and Cyclopentenones. Tetrahedron Letters, 25(44), 5043-5046. https://doi.org/10.1016/S0040-4039(01)91114-1 (Original work published 1984)