An Efficient Separation Method for Enol Phosphate and Corresponding β-Ketophosphonate from Their Mixtures Under Aqueous Conditions
作者:Cornelis M. Moorhoff
DOI:10.1081/scc-120021033
日期:2003.7
Separation of a mixture beta-ketophosphonate 3 and their corresponding enol phosphate 4 is efficiently carried out in aqueous alkaline solutions. Enol phosphate 4 is first extracted with hexanes:dichloromethane (19:1). Acidification of the aqueous layer followed by extraction of the beta-ketophosphonate 3 with dichloromethane completes the separation. Thus, when 1-bromo-2,4-pentadione 1a reacted with triethyl phosphite to give diethyl (2,4-dioxopentyl)phosphonate 3a (Arbuzov-product) and the corresponding enol phosphate 4a (Perkow-product), separation of the two compounds was carried out using this method.
ETHYL 4-(DIETHOXYPHOSPHINYL)-3-OXOBUTANOATE: SELECTIVE SYNTHESIS OF β-KETO PHOSPHONATES
作者:Charl du Pisani、David F. Schneider、Pieter C. R. Venter