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- W2034353485 abstract "Oxidation of aliphatic aldehyde phenylhydrazones containing ortho-substituents (NO2, Br, or Me) in the N-phenyl ring with lead tetra-acetate-gives significant yields of α-unsubstituted azo-acetates which are azo tautomers of hydrazones. With aromatic aldehyde derivatives the product-orienting influence of the ortho-substituent in the N-phenyl ring was negated or reduced by the aromatic methine substituent. Kinetic measurements were made on series of aliphatic aldehyde 2,4-dinitrophenylhydrazones and 2-bromo-4-nitrophenylhydrazones. Strong steric effects (δ 0.83) for methine substituents were detected for the 2,4-dinitrophenylhydrazone series. The relative influences of the 2-NO2 and 2-Br substituents on the rates were examined. The 2-NO2 group had an exceptionally large rate-retarding effect. The mechanism of the reaction is discussed." @default.
- W2034353485 created "2016-06-24" @default.
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- W2034353485 date "1977-01-01" @default.
- W2034353485 modified "2023-10-11" @default.
- W2034353485 title "Kinetics and product orientation in oxidation of aldehyde 2,4-disubstituted phenylhydrazones by lead tetra-acetate; hydrazone azo tautomers" @default.
- W2034353485 doi "https://doi.org/10.1039/p19770000282" @default.
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