Add time:07/11/2019         Source:sciencedirect.com

1,2-Dehalogenation of tetrachlorocyclopropanes (5, X = Cl, OMe, NPri2, SAllyl) by methyl lithium leads to dichlorocyclopropenes (6, X = Cl, OMe, NPri2, SAllyl); the first two of these react with electron rich and electron poor alkenes at 20°C to give cyclopropanes which are apparently derived by trapping of vinylcarbenes (8) rather than (20). Reaction of the derived vinylcyclopropanes with base leads either to ethyl cyclopropyl ketones or to allylidenecyclopropanes.

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