[2+2] cycloadditions of 2,2-bis(trifluoromethyl)ethylene-1,1-dicarbonitrile with enol ethers, 1,1-dimethylbutadiene, and allyltrimethylsilane

Add time:08/08/2019    Source:sciencedirect.com

Vinyl ethers and the title compound (BTF) form cyclobutanes via 1,4-dipoles which can be intercepted with ethanol or acetic acid. Cis- and trans-1-ethoxypropene react with BTF nonstereospecifically in agreement with a stepwise mechanism. 1,1-Dimethylbutadiene or allyltrimethylsilane undergo [2 + 2] cycloadditions with BTF, too.

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