Add time:07/13/2019         Source:sciencedirect.com

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-ylidene (4). The corresponding products are also obtained when 1,1,2-trichloro- or 1,1,2,2-tetrachloro-3,3-dimethylcyclopropanes are treated with methyl lithium in the presence of alkenes at 0 – 20°C. The cyclopropene (3) is stable in ether solution for more than 10 days at −30°C, but at ambient temperature reacts in 18 h to give the product of insertion of the carbene (4) into the CH bonds adjacent to oxygen.

We also recommend Trading Suppliers and Manufacturers of 1,2-dimethyl-3-(2-methylprop-1-en-1-ylidene)cyclopropane (cas 37817-46-2). Pls Click Website Link as below: cas 37817-46-2 suppliers