Jk. Erguden et E. Schaumann, PHOSPHORYL FUNCTIONALIZED BISHOMOALLYL ALCOHOLS BY RING-OPENING OF EPOXIDES WITH LITHIATED ALLYLDIPHENYLPHOSPHANE OXIDE, Synthesis, (6), 1996, pp. 707
Epoxides are attacked by the lithiated anion of allyldiphenylphosphane
oxide in 1,2-dimethoxyethane as solvent in a boron trifluoride-diethy
l ether complex promoted ring opening reaction to afford a mixture of
regioisomeric bishomoallyl alcohols (alpha- and gamma-attack of the nu
cleophile) in good overall yields. When toluene is used as reaction me
dium a pronounced preference for gamma-attack of the anion is observed
.