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Quinolinium Dichromate Oxidation of Aliphatic Aldehydes: A Kinetic Study

Girija S. Chaubey ; Department of Chemistry, North-Eastern Hill University, Shillong 793022, India
Simi Das ; Department of Chemistry, North-Eastern Hill University, Shillong 793022, India
Mahendra K. Mahanti ; Department of Chemistry, North-Eastern Hill University, Shillong 793022, India

Sažetak

Kinetic data on the rates of quinolinium dichromate oxidation of a series of aliphatic aldehydes have been determined and discussed with reference to aldehyde hydration equilibria. Kinetic results support a pathway proceeding via a rate-determining oxidative decomposition of a chromate ester of an aldehyde hydrate. A cyclic transition state is suggested; being a Hückel-type system (4n + 2), this would be an allowed process. The deuterium isotope effect for the oxidation of acetaldehyde (k_H / k_D = 6.4) indicated a carbon-hydrogen cleavage rather than a carbon-carbon cleavage.

Ključne riječi

kinetics; oxidation; aliphatic aldehydes; quinolinium dichromate; mechanism

Hrčak ID:

103189

URI

https://hrcak.srce.hr/103189

Datum izdavanja:

28.11.2003.

Posjeta: 1.501 *