Accurate in situ 31P{1H} assay of enantiopurity in α-hydroxyphosphonate esters using a diazaphospholidine derivatizing agent
作者:Paul G. Devitt、Michael C. Mitchell、John M. Weetman、Roger J. Taylor、Terence P. Kee
DOI:10.1016/0957-4166(95)00265-q
日期:1995.8
A rapid, convenient and efficient in situ assay of enantiomeric excess in alpha-hydroxyphosphonate esters is reported exploiting P-31/H-1} NMR analysis of the diastereoisomers formed upon condensation with a phosphorochloridite reagent containing a chiral diazaphospholidine ring. Use of this chiral framewark affords chemical shift dispersions >5 ppm between diastereoisomers. Accurate integrations are thus possible once account is taken of differential n.O.e. effects and spin lattice T-1 relaxation rimes of the phosphorus nuclei.