Magnesium triflate [Mg(OTf)2] a highly stable, non-hygroscopic and a recyclable catalyst for the high yielding preparation of diethyl α-trimethylsilyloxyphosphonates from diethyl α-hydroxyphosphonates by HMDS under solventless conditions
and convenient procedure for the easy conversion of various α-hydroxyphosphonates to α-trimethylsilyloxyphosphonates under mild conditions with HMDS in the presence of a catalytic amount of magnesium triflate as a highly stable and a non-hygroscopic recyclable catalyst in neat conditions is described. In order to show the general applicability of this method, we have also applied this procedure successfully
Aluminium Triflate [Al(OTf)<sub>3</sub>] as a Recyclable Catalyst for the Conversion of α-Hydroxyphosphonates, Alcohols and Phenols to Their Corresponding O-Silylated Products with Hexamethyldisilazane (HMDS)
Al(OTf)3 as a recyclable catalyst conducts the efficient conversion of various types of α-hydroxyphosphonates to their corresponding α-trimethysilyloxyphosphonates with HMDS in the absence of solvent at room temperature. The general applicability of the catalyst under solvent-free conditions is demonstrated by applying it for the successful silylation of alcohols and phenols with HMDS in high yields.
Preparation of α-ketophosphonates by oxidation of α-hydroxyphosphonates with neutral alumina supported potassium permanganate (NASPP) under solvent-free conditions and potassium permanganate in dry benzene
作者:Habib Firouzabadi、Nasser Iranpoor、Sara Sobhani
DOI:10.1016/s0040-4039(01)02146-3
日期:2002.1
Various types of α-hydroxyphosphonates were converted to α-ketophosphonates in high yields by potassiumpermanganate in dry benzene or by neutral alumina supported potassiumpermanganate (NASPP) under solvent-free conditions.
A novel synthesis of α- and γ- fluoroalkylphosphonates
作者:G. Michael Blackburn、David E. Kent
DOI:10.1039/c39810000511
日期:——
α-Hydroxybenzylphosphonate esters are efficiently converted into α-fluorobenzylphosphonate esters by diethylaminosulphur trifluoride while the corresponding α-hydroxyallyl- and α-hydroxycinnamyl-phosphonates undergo fluorination with allylic re-arrangement; the corresponding phosphonic acids are formed by de-esterification using bromo- or iodotrimethylsilane.
High yield preparation of α-ketophosphonates by oxidation of α-hydroxyphosphonates with zinc dichromate trihydrate (ZnCr2O7·3H2O) under solvent-free conditions
Various types of α-hydroxyphosphonates were converted to α-ketophosphonates by zinc dichromate trihydrate in high yields and rates under solvent-free conditions.