1018686-41-3Relevant articles and documents
N-Phosphino-amidines and -guanidines: Synthesis, structure and P,N-chelate chemistry
Baiget, Lise,Batsanov, Andrei S.,Dyer, Philip W.,Fox, Mark A.,Hanton, Martin J.,Howard, Judith A. K.,Lane, Philip K.,Solomon, Sophia A.
, p. 1043 - 1054 (2008/09/20)
The syntheses of the cyclic N-phosphino-amidines and -guanidines Ph 2PN(Pri)C(NPri2)N(Pri) (1) and Ph2PN(c-Hex)C(R)N(c-Hex) [R = piperazino (2), morpholino (3), Me (4), and Ph (5)] are reported. DFT studies have identified the preferred structures for compounds 1-5 with the E-configuration being the most stable form for the N-phosphino-amidines, while the Z-conformation is preferred for the N-phosphino-guanidines something that highlights the potential of such systems to act as κ2-P,N-chelates. The differences in donor characteristics of 2-5 have been probed through the study of their corresponding P(v) selenide derivatives (6-9) and their complexes with the cis-RhCl(CO) (10-12) and cis-PdCl2 (13-17) fragments. In line with the DFT studies both the amidines and guanidines are found to coordinate as κ2-P,N-chelates, with the latter being moderately weaker donor ligands. The molecular structures of compounds 3 and 4, together with those of the Rh and Pd complexes 10 and 15, respectively, have been determined in the solid state by X-ray crystallography, the latter confirming bidentate κ2-P,N-chelation. The Royal Society of Chemistry.
