New P-alkyl 2,3-oxaphosphabicyclo-[2.2.2]octene 3-oxides were synthesized by the Bayer–Villiger oxidation of the corresponding 7-phosphanorbornene 7-oxides and were used as precursors for reactive alkylmetaphosphonates useful in the phosphonylation of alcohols. This is the first case that the reactivity of the two regioisomers formed by O-insertion was differentiated and that the fragmentation-related
An efficient method for the esterification of phosphonic and phosphoric acids using silica chloride
作者:Manisha Sathe、Arvind K. Gupta、M.P. Kaushik
DOI:10.1016/j.tetlet.2006.02.159
日期:2006.5
Silica chloride is used as an effective heterogeneous catalyst for the rapid esterification of alkyl/aryl phosphonic/phosphoric acids to their corresponding alkyl/aryl phosphonates/phosphates under mild conditions with quantitative yields.
<i>p</i>-Toluenesulfonic Acid–Celite as a Reagent for Synthesis of Esters of Alkylphosphonic Acids under Solvent-Free Conditions
作者:Arvind K. Gupta、Rajesh Kumar、Devendra K. Dubey、M.P. Kaushik
DOI:10.3184/030823407x218066
日期:2007.6
The coupling reaction of alkylphosphonic acids and alcohols on the surface of p-toluenesulfonic acid–Celite under mild and solvent-free conditions gave the corresponding phosphonates in excellent yields. This method provides a useful rapid synthesis of phosphonates for use in the unambiguous identification of chemical warfare agents.
A Novel Synthesis of Dimethyl 2-Oxoalkenylphosphonate from Pulegone Hydrogen Chloride Adduct
作者:Koichi Kojima、Shinichi Saito
DOI:10.1055/s-1992-26274
日期:——
The one-step synthesis of dimethyl 2-oxoalkenylphosphonates 2 from pulegone (p-menth-4(8)-en-3-one) hydrogen chloride adduct 4 and dimethyl lithioalkylphosphonates is described.
The enantioselectivehydrogenation of β-(acyloxy)- and β-(acylamino)vinylphosphonates with rhodium catalysts based on chiral phosphane-phosphite ligands has been studied. In the case of the β-(acyloxy)vinylphosphonates, the reaction also produces an achiral phosphonate resulting from the elimination of the benzoate group. High ligand modularity has led to a highly chemo- and enantioselective catalyst