Aktivität: Vortrag oder Präsentation › Vortrag bei Konferenz oder Fachtagung › Science to science
The number of publications that examine α,α′ - nitrogen stabilized cyclic carbenes (NHC, Arduengo carbenes) is quite large given that there is just one analogous α,α′- phosphorus stabilized compound of this type . Both, NHCs and their heavier analogous diaminotetrylenes, have, due to their high reactivity, substantial possibilities in transition metal catalysis. Although there is just one cyclic diphosphatetrylene several acyclic ones are known in literature. Most of these diphosphatetrylenes are either stabilized by intermolecular bases or via dimerization. Monomeric diphosphatetrylenes usually feature very bulky substituents for stabilization [2,3]. Izod  recently characterized monomeric diphosphastannylenes and –germylenes with large substituents that have one planar phosphorus centre which might aid the stabilisation. Using calculations at the DFT level together with exact cone angle calculations  we explored the stabilization effects of various phosphorus substituents (H, Me, tBu, Ph, TMS, Hyp=(Si(SiMe3)3)) on diphosphastannylenes. Our synthetic work led to the isolation if two supermesityl(trimethylsily)phosphanides and the characterisation of a novel monomeric diphosphastannylene, [HypP(SiMe3)]2Sn.