Phosphide-borane complexes as key intermediates in the synthesis of optically active 1,3-oxaphospholanes

The syntheses, from the triphenylphosphine-borane complex, of chiral 1,3-oxaphospholanes and optically active bis-1,3-oxaphospholanes, obtained by cleavage of a carbon-phosphorus bond with lithium, are described. © 1997 John Wiley & Sons, Inc.