1,2-Diphosphinobenzene as a synthon for the 1,2,3-triphospha- and 2-arsa-l,3-diphosphaindenyl anions and a stable organo derivative of the P8 unit of Hittorf s phosphorus

摘要

The electronic structure of the 1,2,3-triphosphaindenyl ligand suggests that it should exhibit enhanced π-acceptor properties when compared to the η~5-indenyl system; this insight encouraged us to develop a simple synthetic pathway from 1,2-diphosphino-benzene to the 1,2,3-C_6H_4P_3 and 2-As-l,3-C_6H_4P_2 anions, both of which have been structurally characterised by X-ray crystallography; as a bonus from these studies we also obtained the first structurally characterised organo derivative of the P_8 unit present in Hittorf s phosphorus.