Shall we dance? Within the proposed mechanism for the palladium-catalyzed title reaction, the strained alkene norbornene (or norbornadiene) enters and exits the catalytic cycle in a catalytic "square dance", acting as both a promoter and a coupling partner in the formation of four carbon-carbon bonds, two of them by challenging C--H activation processes.
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Gericke et al. (2009) studied this question.
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