Cloke F Geoffrey N, Hitchcock Peter B, Hunnable Philip, Nixon John F, Nyulászi Lászlo, Niecke Edgar, Thelen Vera
School of Chemistry, Physics and Environmental Sciences, University of Sussex, Brighton, Sussex, BN1 9QJ (UK), Fax: (+44) 1273-677196.
Department of Inorganic Chemistry, Technical University of Budapest, H-1521 Budapest, Gellert ter 4 (Hungary).
Angew Chem Int Ed Engl. 1998 May 4;37(8):1083-1086. doi: 10.1002/(SICI)1521-3773(19980504)37:8<1083::AID-ANIE1083>3.0.CO;2-C.
The sterically demanding groups on the tricoordinate phosphorus atom, the π-electron acceptors substituted on the ring, and the dicoordinate phosphorus atoms within the ring are the most significant factors contributing to the planarity and aromaticity of the 1,2,4-triphosphole ring in 1. The Bird aromaticity index for 1 shows that it has the most pronounced aromatic character of all known phospholes.
三配位磷原子上的空间位阻基团、环上取代的π电子受体以及环内的二配位磷原子是导致化合物1中1,2,4 - 三磷环具有平面性和芳香性的最重要因素。化合物1的Bird芳香性指数表明，它具有所有已知磷环中最显著的芳香特征。
