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Phosphonic acid monoesters

Protected-amino phosphonic acid monoesters 51 are usually activated by conversion to the phosphonochloridates 52, then coupled with appropriate amine components such as C-protected amino adds or peptides to give phosphonoamidates 53 (Scheme 17). This procedure is in contrast to typical peptide coupling conditions, in which carboxylic acid chlorides are avoided because of their susceptibility to epimerization at the a-carbon. Since enolate-... [Pg.511]

Scheme 17 Formation of Phosphonamidates from Phosphonic Acid Monoester 4-65-67-72-731... Scheme 17 Formation of Phosphonamidates from Phosphonic Acid Monoester 4-65-67-72-731...
The synthesis of a,ft--unsaturated halides has been realized via new dephosphorylation reactions of ,/l-clhylcnic and acetylenic phosphonic acid monoesters with (biscollidine)iodine(I) or (biscollidine)bromine(I) hexafluorophosphate (Scheme 6)23... [Pg.281]

Gaikwad AG, Chitra KR, Surender GD, and Damodaran AD. Studies on kinetics of forward and backward extraction of neodymium by using phosphonic acid monoester as an acidic extractant. Chem Eng J Biochem Eng J, 1995 60(1-3) 63-73. [Pg.404]

Ester hydrolysis is most conveniently used because (1) its reaction mechanism is well established, and (2) both substrate and transition state analogs are easy to obtain. In Fig. 8.8b, phosphonic acid (2) is used as a transition state analog of the hydrolysis of substrate 3 [26]. A vinyl monomer of amidine 1 is chosen as a functional monomer because it readily forms stable complexes with the carboxylic acid ester and the phosphonic acid monoester. The imprinted polymers are synthesized in THF from 1 (the monomer), 2 (the template), and ethylene glycol dimethacrylate (the cross-linker) by using AIBN as the radical initiator. [Pg.137]

Figure 6 Generation of a catalytic MIP using a phosphonic acid monoesters as a template which imitates the transition state of the reactions. Figure 6 Generation of a catalytic MIP using a phosphonic acid monoesters as a template which imitates the transition state of the reactions.
Without additional reagents Phosphonic acid monoesters from phosphonochloridates... [Pg.51]

Phosphorous acid diesters. Di- -butyl phosphorochloridate added in small portions to a highly dispersed, stirred suspension of NaBH4 in dioxane, refluxed for 5 h, cooled, water added cautiously, and acidified to pH < 2 with 6 M HCl - dibutyl phosphite. Y 85.4%. F.e., incl. phosphonous acid monoesters, s. R. Engel, S. Chakraborty, Synth. Commun. 18, 665-70 (1988). [Pg.23]

Phosphonic acid 2,2-dichlorovinyl esters from phosphonous acid monoesters and chloral... [Pg.60]

Without additional reagents Phosphonous acid monoesters... [Pg.46]

Althongh chemical models for phosphatases have been developed,artificial componnds that catalyze the hydrolysis of phosphonic acid monoesters snch as mono(4-nitrophenyl)phosphate (MNP) are limited, and most contain two metal-macrocyclic polyamine complexes connected by covalent bonds. ... [Pg.51]

Triethyl phosphate Phosphonic acid monoesters from phosphonic acid dichlorides Nucleoside 5 -trichloromethylphosphonates... [Pg.343]

See other pages where Phosphonic acid monoesters is mentioned: [Pg.510]    [Pg.231]    [Pg.98]    [Pg.98]    [Pg.245]    [Pg.265]    [Pg.265]    [Pg.38]    [Pg.320]    [Pg.352]    [Pg.59]    [Pg.394]    [Pg.513]    [Pg.274]    [Pg.721]    [Pg.39]    [Pg.39]    [Pg.301]    [Pg.267]    [Pg.157]    [Pg.344]    [Pg.457]    [Pg.152]    [Pg.271]    [Pg.271]    [Pg.557]    [Pg.282]   


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Monoester

Monoesters

Phosphonate monoesters

Phosphonic acid

Phosphonic acid/phosphonate

Phosphonic acids acidity

Phosphonous acid

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