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Rhodium(III)‐ and cobalt(III)‐catalyzed C−H activation of indoles and coupling with 1,6‐enynes is discussed. Under rhodium(III) catalysis, the alkyne insertion follows 2,1‐regioselectivity with a subsequent type‐I intramolecular Diels–Alder reaction (IMDA) to afford [6,5]‐fused cycles. When catalyzed by the cobalt(III) congener, 1,2‐insertion of the alkyne is preferred, and followed by a rare type‐II...
Styrene underwent unprecedented coordination–insertion copolymerization with naked polar monomers (ortho‐/meta‐/para‐methoxystyrene) in the presence of a pyridyl methylene fluorenyl yttrium catalyst. High activity (1.26×106 g molY−1 h−1) and excellent syndioselectivity were observed, and high‐molecular‐weight copolymers (24.6×104 g mol−1) were obtained. The insertion rate of the polar monomers could...
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