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Treatment of 1-alkynylphosphine with magnesium dialkylcuprate in ether results in regio- and stereoselective syn-carbocupration. The alkenylcopper intermediate reacts with electrophile, which leads to allylation, acylation, and phosphination. The phosphination offers a new route to gem-diphosphinoalkene, an interesting phosphorus-based organic structure.
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Kanemura et al. (2007) studied this question.
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