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Donor-substituted phosphanes – surprisingly weak Lewis donors for phosphenium cation stabilisation

By Ewan R. Clark, Andryj M Borys and Kyle Pearce


Paradoxically, N- and O- donor substituted tri-arylphosphanes are shown to be weaker donors than PPh3 when binding the soft Lewis acid moiety [PPh2]+. This arises from internal solvation and rehybridisation at phosphorus, precluding chelation and increasing steric demand, in direct contrast to coordination modes observed for metal complexes

Topics: QD
Year: 2016
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