1, 2-Dichloro-3, 3-dimethylcyclopropene as a source of 1, 2-dichlo-3-methylbut-2-enzylidene at ambient temperature

MS Baird, HH Hussain

Index: Baird, Mark S.; Hussain, Helmi H. Tetrahedron, 1989 , vol. 45, # 19 p. 6221 - 6238

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Citation Number: 24

Abstract

Reaction of 2-bromo-1, 1, 2-trichloro-3, 3-dimethylcyclopropane with one mol. equiv. of methyl lithium at− 90 to 0° C leads to 1, 2-dichloro-3, 3-dimethylcyclopropene. This is stable for several hours at 20° C in chloroform or benzene solution but in the presence of an electron-rich or electron-poor alkene reacts in 15 m to 2 h under these conditions to give products apparently derived by reaction of these with 1, 2-dichloro-3-methylbut-2-en-1- ...