Kinetics of [2+2] cycloadditions of 2,2-bis(trifluoromethylethylene-1,1-dicarbonitrile with enol ethers, 1,1-dimethylbutadiene, and allyltrimethylsilane
作者:Reinhard Brückner、Rolf Huisgen
DOI:10.1016/0040-4039(90)80124-5
日期:1990.1
The rate constant with ethyl vinylether is enhanced by α-donor substitutents whereas gb-methyl groups strongly retard by steric hindrance. The title compound (BTF) is 2400 times more active than TCNE towards ethyl vinylether in benzene. The rates of the title reactions Increase 70- to 2300-fold with solvent polarity.