PH-funktionelle Phosphane mit α- und β-ständigen 2-Pyridylsubstituenten 2-C₅H₄N—[CH₂]_n—PRH (R = H, iPr, tBu, Ph, 2-C₅H₄N-[CH₂]_n; n = 1, 2) / PH-Functional Phosphanes with 2-Pyridyl Substituents in α- or β-Position 2-C₅H₄N —[CH₂]_n—PRH (R = H, iPr, tBu, Ph, 2-C₅H₄N-[CH₂]_n; n = 1,2)

Abstract

PH-functional phosphanes containing a 2-pyridyl substituent in α- or β-position to phosphorus, e.g. 2-C 5 H 4 N - [CH 2 ] n -PRH (R = H, iPr, tBu, Ph; n = 1,2) have been obtained. The reactivity of the PH-groups can be employed for the synthesis of tridentate NPN-hvbrid donors. [2-C 5 H 4 N -CH 2 -CH 2 ] 2 PR (R = H. Ph). The phosphanes 2-C 5 H 4 N-[CH 2 ] n -PRH behave as monodentate ligands in transition metal complexes and form labile chelate ring systems. They may bridge metal-metal bonds to form seven membered ring systems, e.g. Mo 2 PC 3 N. The coordination of the N-donor of the ligands 2-C 5 H 4 N - [CH 2 ] n -PRH to a transition metal atom is indicated by a lowfield shift and a small 31 P - 13 C-splitting of the 13 C{ 1 H} NMR signal of carbon atom 6 in the pyridin ring system.