Reduction by a Model of NAD(P)H. 29. Kinetics and Isotope Effects for the Reduction of Substituted Trifluoroacetophenone

Article abstract of DOI:10.1021/ja00398a027

Kinetics for the reduction of substituted and unsubstituted α,α,α-trifluoroacetophenone by a model of NAD(P)H in acetonitrile in the presence and absence of a magenesium ion, a catalyst, has been studied.The catalyzed and uncatalyzed reactions show linear free-energy relationships.It is found that the magnesium ion retards the reaction of ceratain substituted trifluoroacetophenones.The kinetic isotope effect and the isotopic ratio in the product are also studied.These values vary depending on the substituent and on the presence or absence of the magnesium ion.The result indicates that there is at least one intermediate in the reaction and is discussed in relation to the stability of the intermediate as well as that of the transition states.