1,2,5-Azadiphospholium and 1,3-Diphospholium Ions

1,2?5,5?5-azadiphospholium structures

“…The analogous reaction with the tetraphenyldiphosphine diphenylphosphinoimine 6, which is a more stable isomer [3] than tris(diphenylphosphino)amine (Ph 2 P) 3 N, results in the formation of 4-diphenylphosphino-2,2,3,5,5-pentaphenyl-1,2,5-azadiphospholium bromide 7. The pathway leading to these products has been discussed [2]. The cations of 5 and 7 challenge a structural comparison with related open chain cations (see Scheme 1).…”

“…Received 18 February 1997 SCHEME 1 The reactions of bromophenylacetylene 1 with bis(diphenylphosphino)methane 2 and bis(diphenylphosphino)amine 4 provide an easy access to 1,1,3,3,4-pentaphenyl-1,3-diphospholium bromide 3 and 2,2,3,5,5-pentaphenyl-1,2,5-azadiphospholium bromide 5 [1,2]. The analogous reaction with the tetraphenyldiphosphine diphenylphosphinoimine 6, which is a more stable isomer [3] than tris(diphenylphosphino)amine (Ph 2 P) 3 N, results in the formation of 4-diphenylphosphino-2,2,3,5,5-pentaphenyl-1,2,5-azadiphospholium bromide 7.…”