Organolanthanide-Catalyzed Cyclodimerizations of Disubstituted Alkynes

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Abstract

The lanthanide alkyls Cp2*LnCH(SiMe3)2 (Ln = La, Ce) are efficient catalysts for the cyclodimerization of 2-alkynes MeC≡CR (R = Me, Et, n-Pr) to 1,2-disubstituted 3-alkylidenecyclobutenes. The first step in the reaction is a propargylic metalation of the α-methyl group, giving Cp*2LnCH2C≡CR compounds and free CH2(SiMe3)2. © 1990, American Chemical Society. All rights reserved.

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Heeres, H. J., Heeres, A., & Teuben, J. H. (1990). Organolanthanide-Catalyzed Cyclodimerizations of Disubstituted Alkynes. Organometallics, 9(5), 1508–1510. https://doi.org/10.1021/om00119a023

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