A palladium‐catalyzed cyclization of enediynes for the synthesis of benzofulvenes 2 in yields of 59–76 % was accomplished by treatment of dialkynylbenzenes 1 with 5 mol‐% of PdX 2 and 3 equiv. of CuX 2 in acetonitrile at 60 °C for 2 h. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007)
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Lee et al. (2007) studied this question.
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