Use of the 2,5-bis-(tert-butyl)phospholide anion as an η5-ligand: stabilisation of η5-phospholyl complexes of ruthenium and rhodium

Abstract
The 2,5-bis-(tert-butyl)phospholide anion promotes η5-complexation to late transition metals in cases where unhindered phospholyls may favour η1-ligation through the phosphorus lone pair.