Triflic acid mediated functionalization of α-hydroxyphosphonates: route for sulfonamide phosphonates
作者:Gangaram Pallikonda、Manab Chakravarty
DOI:10.1039/c3ra43823f
日期:——
An operationally simple synthetic method for (±)-α-aryl/methylsulfonamidomethylphosphonates and new (±)-γ-aryl/methyl sulfonamidomethylvinylphosphonates has been developed through straightforward reactions of (±)-α-hydroxyphosphonates with sulfonamides in the presence of triflic acid (TfOH) at room temperature in a vessel open to air. For γ-dimethylallylhydroxyphosphonate, the (E)-1,3-butadienylphosphonate was formed quantitatively using TfOH while FeCl3 afforded the expected product in moderate yield unpredictably. The favourable sulfonoamidation of benzyl alcohol is also observed when TfOH was used for α-hydroxyphosphonates having a benzyloxy group.
synthesized from the reaction of aldehyde (1) with triethylphosphite (2) in the presence of oxone and evaluated for their antioxidantproperties against lipid peroxidation, reduced glutathione, superoxide dismutase, and catalase. The majority of the compounds showed promising antioxidant activity. Diethyl anthracen‐9‐yl (hydroxy) methylphosphonate (3n) is the most potent and biologically active compound
An easy access to α-aryl substituted γ-ketophosphonates: Lewis acid mediated reactions of 1,3-diketones with α-hydroxyphosphonates and tandem regioselective C–C bond cleavage
作者:Gangaram Pallikonda、Manab Chakravarty、Manoj K. Sahoo
DOI:10.1039/c4ob01091d
日期:——
The α-aryl substituted (±)-γ-ketophosphonates are produced by Lewis acid mediated reactions of α-hydroxyphosphonates with 1,3-diketones.
Aryl sulfonamidomethylphosphonates as new class of green corrosion inhibitors for mild steel in 1M HCl: Electrochemical, surface and quantum chemical investigation
作者:Chandrabhan Verma、A. Singh、G. Pallikonda、M. Chakravarty、M.A. Quraishi、I. Bahadur、E.E. Ebenso
DOI:10.1016/j.molliq.2015.06.013
日期:2015.9
Synthesis and corrosion inhibition property of five aryl sulfonamidomethylphosphonates in 1 M HCl are reported using chemical, electrochemical, scanning electron microscopy (SEM) and quantum chemical calculation methods. Experimental results show that aryl sulfonamidomethylphosphonates are good corrosion inhibitors for mild steel in 1 M HCl and their inhibition efficiency increases with concentration. Potentiodynamic polarization studies show that studied inhibitors act as mixed type and their adsorption on mild steel surface obeys the Langmuir's adsorption isotherm. The thermodynamic (E-a, Delta H*, Delta S*, Delta G(0) (ads)) and quantum chemical parameters were calculated and discussed to describe the mechanism of adsorption. (C) 2015 Elsevier B.V. All rights reserved.