Journal
JOURNAL OF ORGANIC CHEMISTRY
Volume 73, Issue 15, Pages 5985-5988Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jo8005254
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At elevated temperatures 3-methyl-cyclopropene-3-carbonitrile I was found to tetramerize giving compound 2 (3-methyl-2,3-bis(2-t-methyl-2-c-eyanocyclopropyl)- 1-(2-t-methyl-2-c,3-c-dicyanocyclopropyl)-cyclopropene) in good yields. This is the first example of Alder-ene type oligomerization of a 3,3-disubstituted cyclopropene. On the basis of the product geometry and stereoselective character of the reaction, a mechanism of formation of 2 involving CN-Alder-ene reaction was proposed. DFT modeling of the mechanism has shown that the CN-Alder-ene reaction is possible as a stepwise process involving a biradical intermediate.
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