Reduction of Phosphinites,Phosphinates, and Related Species with DIBAL-H

Diisobutylaluminium hydride has been found to be an excellentreducing agent for phosphinites, phosphinates, and chlorophosphines.By performing reductions in situ, direct synthesis of secondaryphosphine boranes from Grignard reagents has been achieved withoutisolation or purification of any intermediates.