Kinetic Studies on Reactions of Monocyclic Oxyphosphoranes with Ethylene Glycol

摘要

The reaction of monocyclic oxyphosphorane compounds 1a,1b,1c with ethylene glycol in pyridine was studied by 31P NMR.The results show that compound 1a the an unsaturated five-membered ring reacts faster than compound 1b the a saturated ring attached by two trans p-nitro phenyl groups,which in turn reacts greatly faster than the Cis- compound 1c. To interpret the mechanism, a hexacoordinate intermediate whose five-membered ring occupied the e-,e- position was proposed.