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Musigmann, Klaus; Mayr, Herbert and Meijere, Armin de (1987): Addition reactions of the trichlorocyclopropenylium ion with alkenes. A novel access to cyclopropene and cyclopropenone derivatives. In: Tetrahedron Letters, Vol. 28, No. 39: pp. 4517-4520 [PDF, 235kB]


Trichlorocyclopropenylium tetrachloroaluminate 1+-AlCl−4 reacts with alkenes in nitromethane at −35°C to give the 1:1 addition products 2+-AlCl−4, which can be converted into the 2-chlorocyclopropenones 5 or the ä,β-acetylenic carboxylates 6.

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