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Insights into the mechanism of the rhodium-catalyzed hydrophosphorylation of alkynes with the cyclic hydrogen phosphonate 1 are provided by isolable RhIII intermediates 2 and 3. The reactions proceed at room temperature and give high yields of exclusively (E)-alkenyl phosphonates 4, which are not readily prepared by other routes. X=halide, L=phosphane or hydrogenphosphonic acid.
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Zhao et al. (2001) studied this question.
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