Template Synthesis of the First 1,4,7-Triphosphacyclononane Derivatives
This work was funded by the UK Engineering and Physical Sciences Research Council.
Abstract
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.