Synthesis and unusual [2+2]-cycloaddition reactions of ethyl 4-chloro-2-oxobut-3-ynoate with unactivated alkenes
Andrey B. Koldobskii, Ekaterina V. Solodovaa, Ivan A. Godovikova and Valery N. Kalinina
Tetrahedron, Volume 64, Issue 40, 29 September 2008, Pages 9555-9560
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http://dx.doi.org/10.1016/j.tet.2008.07.066