Template synthesis of 9-membered triphospha-macrocycles with rigid o-phenylene backbone functions
Abstract
[η5-CpRFe(CH3CN)(1,2-diphosphinobenzene)]+ complexes are readily formed from [η5-CpRFeL3]+ salts and act as template precursors for the intramolecular hydrophosphination of co-ordinated trivinylphosphine with 1,2-diphosphinobenzenes. This sequence constitutes a versatile synthetic route to a new class of co-ordinated triphosphacyclononanes bearing a rigid o-phenylene backbone link. The efficiency of the synthesis depends markedly upon the nature of the CpR