Spirooxyphosphoranes with quintuply-connected phosphorus were made from the reaction of phenanthrenequinone, benzil, biacetyl, and 1-phenylpropanedione with 5-membered and 6-membered cyclic phosphite esters and amides. The P31 NMR spectra were compared with those of the oxyphosphoranes derived from open-chain trimethyl and triphenyl phosphites. Further comparisons were made with spiroaminooxyphosphoranes
Abstract The reaction of monocyclic oxyphosphoranecompounds 1a, 1b, 1c, with ethylene glycol in pyridine was studied by 31P NMR. The results showed that compound 1a, with an unsaturated five-membered ring reacts slightly faster than compound lb with a saturated ring attached by two trans p-nitro phenyl groups, which reacts 100 times faster than the cis compound lc. To interpret the mechanism, hexacoordinated
Reaction Kinetics of Oxyphosphoranes with Model Compounds of Nucleosides
作者:Xin Chen、Nan-Jing Zhang、Yu-Fen Zhao
DOI:10.1006/bioo.1996.1051
日期:1997.2
Ester exchange reaction kinetics of oxyphosphoranes with several kinds of alcohols, the model compounds for nucleosides, has been investigated. Comparison of the reaction rates of oxyphosphorane (1) with alcohols indicated that the ester exchange rates of diols were much faster than that of monoalcohols. These results might provide a clue for the intrinsic difference between ribonucleotides and 2'-deoxyribonucleotides. (C) 1997 Academic Press.