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Activation of alkynes with platinum salts allows their reaction with alkenes, giving rise to a myriad of interesting processes like cyclizations, formation of cyclopropanes, or metathesis. Weak nucleophiles can also participate in the processes leading to alkoxycyclizations. There are intriguing mechanistic aspects of these processes in which subtle variations of the reaction conditions and/or substrate structures can lead to completely different products.
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Añorbe et al. (2004) studied this question.
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