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The first CC coupling catalyzed by a neutral Cp*Ru complex (Cp*RuCl(cod)) is reported in the reactions of norbornenes and norbornadiene (1) with different alkynes (2). Besides the 2 + 2 cycloadducts 3, the reaction with terminal alkynes and 1 unexpectedly also yields the 1,3-benzene derivatives 4.
Mitsudo et al. (Thu,) studied this question.
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