Lewis acid controlled tautomerization of a metallated cyclenphosphorane
Abstract
The species HcyclenPMo(CO)5(2), which contains a trigonal bipyramidal phosphorus with a P ⋯ N transannular interaction, reacts with HBF4 or Me3OBF4 and leads to formation of phosphoranide (R4P:–) adducts, whereas reaction of (2) with THF·BH3(THF = tetrahydrofuran) yields the unexpected phosphine adduct H(BH3)cyclenP-Mo(CO)5(5), the X-ray structure of which reveals an unprecedented conformation of the cyclenP ring.