Next reactant, new pathway: An inexpensive cobalt–diphosphine complex is able to catalyze the intermolecular Alder–ene reaction of internal alkynes with terminal alkenes. The products are functionalized 1,4-dienes (see scheme) which are obtained in good yields and with excellent chemo-, regio-, and stereoselectivities.
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Hilt et al. (2007) studied this question.
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