17260-79-6Relevant articles and documents
Redox potentials and acid-base equilibria of NADH/NAD+ analogues in acetonitrile
Anne,Moiroux
, p. 4608 - 4614 (2007/10/02)
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Regioselectivity and Kinetics of Hydride Transfer in Substituted 1-Benzyl-3-quinolinecarboxamide Redox Reactions
Romoff, Todd T.,Sampson, Nicole S.,Eikeren, Paul van
, p. 4454 - 4459 (2007/10/02)
A systematic study on the factors that affect the regioselectivity and rate of hydride transfer in systems involving 1-benzyl-4-methyl-3-quinolinecarboxamides as donors or acceptors is reported.The study reports two major findings: (1) Hydride transfers from borohydride or 1-propyl-1,4-dihydronicotinamide to 1-benzyl-4-methyl-3-quinolinecarboxamide cation display distinct regioselective patterns-borohydride results in hydride transfer to the 2-position of the acceptor and dihydronicotinamide results in hydride transfer to the 4-position of the acceptor. (2) Substitution of the 4-hydrogen by a methyl group on either the oxidant or reductant quinoline lowers the rate constants for hydride transfer by a factor of over 2000.When methyl replaces hydrogen in both the oxidant and reductant, the rate constant for hydride transfer is lowered by a factor of over 5 000 000.These observations are interpreted in terms of a two-step mechanism: (1) formation of a ?-complex between the oxidant and reductant stabilized by charge-transfer interactions and (2) rate-determining hydride transfer within the complex.
Hydride Transfer and Oxyanion Addition Equilibria of NAD+ Analogues
Ostovic, Drazen,Lee, In-Sook Han,Roberts, Roger M. G.,Kreevoy, Maurice M.
, p. 4206 - 4211 (2007/10/02)
Equilibrium constants, K, have been determined for the reduction of 10-methylacridinium ion by 15 N-heterocyclic hydride donors: acridine, quinoline, pyridine, and phenanthridine derivatives.The solvent was a mixture of 2-propanol and water in the ratio 4 : 1 by volume.Reduction potentials have been estimated for the corresponding cations in aqueous solution by assuming that the K's would be the same and accepting -361 mV as the reduction potential of the 3-(aminocarbonyl)-1-benzylpyridinium ion.These reduction potentials span 430 mV.Values of pKR have also been determined for six of the cations in the same solvent.For derivatives of the same ring system, -ΔlogK is approximately equal to ΔpKR, but a 4 log unit discrepancy appears when phenanthridine derivatives are compared with the 9-methylacridinium ion.