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.
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Mitsudo et al. (1994) studied this question.
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