1P nuclear magnetic resonance and infrared spectroscopic evidence for co-ordinatively unsaturated zerovalent tungsten generated by interaction of W(CO)5L (L = PPh3 or PBun3) with AlBr3
Abstract
With the metathesis catalyst W(CO)5L·AlBr3, AlBr3 acts first as a Lewis acid to give a 1 : 1 adduct which further yields a co-ordinatively unsaturated, relatively stable zerovalent tungsten.