Oxovanadium(IV)-Salen Ion Catalyzed H<sub>2</sub>
O<sub>2</sub>
Oxidation of Tertiary Amines to <i>N</i>
-Oxides- Critical Role of Acetate Ion as External Axial Ligand
The oxovanadium(IV)‐salen ion catalyzed H2O2 oxidation of N,N‐dimethylaniline forms N‐oxide as the product of the reaction. The reaction follows Michaelis–Menten kinetics and the rate of the reaction is accelerated by electron donating groups present in the substrate as well as in the salen ligand. This peculiar substituent effect is accounted for in terms of rate determining bond formation between
氧钒(IV)-salen离子催化N的H 2 O 2氧化,N-二甲基苯胺形成N-氧化物作为反应产物。该反应遵循Michaelis-Menten动力学,并且反应速率受底物以及Salen配体中存在的给电子基团的影响而加快。这种特殊的取代作用是通过速率决定过渡态下氧化剂的过氧键与底物N原子之间的键形成速率来解释的。三氯乙酸(TCA)将氧化剂的λ最大值移至红色区域,并极大地催化了反应。N的切割钒配合物的O键导致中等产率的产物。但是在TCA存在下,产物的百分产率变得极好。