The base-catalyzed cyclization of 1,2-bis(phosphanyl)ethane with trivinylphosphane on a pentamethylcyclopentadienyl iron template results in the high-yield synthesis of the first triphosphacyclononane derivative containing one vinyl-functionalized and two secondary phosphanes. The vinyl triphosphacyclononane is readily hydrogenated and alkylated to give the tritertiary 1,4,7-triethyltriphosphane macrocycle 1.
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Edwards et al. (2000) studied this question.
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