Synthese, Struktur und dynamisches Verhalten von 1,3,5‐Triaza‐2,4‐diphospha‐1,4‐pentadienen

Synthesis, Molecular Structure, and Dynamic Behaviour of 1,3,5‐Triaza‐2,4‐diphospha‐1,4‐pentadienes Chloro(arylimino)phosphane ( 1 ) reacts with the 1,3‐diaza‐2‐phosphaallylic system 3 to form 1,3,5‐triaza‐2,4‐diphospha‐1,4‐pentadienes Ar‐N=P‐N(R)‐P=N‐Ar (Ar = 2,4,6‐tBu 3 ‐C 6 H 2 ; R = tBu, 2,4,6‐iPrc3C 6 H 2 ) ( 4a‐c ). the molecular structure of 4a (“ Exo‐endo‐S conformation” ) as well as the dynamic behaviour of the compounds in solution are discussed. the observed temperature dependance of the NMR spectra of 4c was interpreted as a sigmatropic 1,3‐rearrangement followed by a P‐N rotation.