Leaving Group Assistance in the La<sup>3+</sup>-Catalyzed Cleavage of Dimethyl (<i>o</i>-Methoxycarbonyl)aryl Phosphate Triesters in Methanol
作者:David R. Edwards、C. Tony Liu、Graham E. Garrett、Alexei A. Neverov、R. Stan Brown
DOI:10.1021/ja904659e
日期:2009.9.30
cleavage of the phosphatetriesters with poor leaving groups relative to those with good leaving groups and (2) it provides an increase in cleavage rate relative to those of comparable substrates that do not have that functional group, e.g., k2(La)(dimethyl o-(methoxycarbonyl)phenyl phosphate)/k2(La)(dimethyl phenyl phosphate) = 60. Activation parameters for the La3+(2)-catalyzed methanolysis of 4a and dimethyl
New phosphorylating agents for general synthesis of mixed phosphate esters
作者:Tomohisa Nagamatsu、Takehisa Kunieda
DOI:10.1016/s0040-4039(00)96128-8
日期:——
effective procedure has been developed for the general synthesis of mixed alkyl or arylphosphate esters by metal-catalyzed phosphorylation of alcohols with aryl bis(2-oxo-3-oxazolinyl)phosphinate. Among metallic acetylacetonates examined as catalysts, the zirconium complex was the most effective as in activity order of Zr(IV)> Ce(III)> Zn(II)> Mn(III)> Mn(II)-complexes.