2.4- dinitrophenyl triester

The reactions in cationic micellar media between the a-nucleophile salicylhydroxa-mate anion (SHA ) and p-nitrophenyl benzoate (PNPB), tris(3-nitrophenyl) phosphate (TRIS), and bis(2,4-dinitrophenyl) phosphate (BDNPP) were examined kinetically. SHA was incorporated into CTAB micelles and accelerated dephosphorylation of TRIS over the pH range 6.7—11.4. At 1.0 mM SHA in CTAB, the nucleophilicity of SHA followed the order of reactivity, PNPB (C=0, carboxylate ester) > TRIS (phosphate triester) > BDNPP (phosphate diester) monoanionic SHA and dianionic SHA are the reactive species. The critical micelle concentration of CTAB decreased and the fractional ionization constant, a, increased with an increase in the concentration of SHA . ... [Pg.86]

The products of phosphorylation of imidazole (IMZ) by two activated phosphate diesters, BDNPP (72) and ethyl 2,4-dinitrophenyl phosphate (EtDNPP) (73) and the related triester, diethyl 2,4-dinitrophenyl phosphate (Et2DNPP) (74) are stable enough... [Pg.89]

Dephosphorylation reactions of 2,4-dinitrophenyl phosphate with benzohydroxamate and deferoxamine (DFO) (130) occur by attack at phosphorus, but because they involve attacks by monoanions on dianions, they are only modestly accelerated by these a-nucleophiles. This is in contrast to their extraordinary reactivity towards the di- and triesters of 2,4-dinitrophenyl phosphate (described in the section titled Phosphate and Phosphonate Diester and Triesters ). [Pg.80]

Dephosphorylation reactions of mono-, di-, and triesters of 2,4-dinitrophenyl phosphate (100) with deferoxamine (DFO) and... [Pg.262]

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