Oxidation, Oxidative Esterification and Ammoxidation of Acrolein over Metal Oxides: Do These Reactions Include Nucleophilic Acyl Substitution?
XII European Congress on Catalysis “Catalysis: Balancing the use of fossil and renewable resources” (EuropaCat-XII)
30 Aug - 4 Sep 2015
|| Koltunov Konstantin Yuryevich
, Sobolev Vladimir Ivanovich
, Bondareva Valentina Mikhailovna
Boreskov Institute of Catalysis SB RAS
Novosibirsk State University
National Research Tomsk State University
It is known that nucleophilic acyl substitution in the RCOX compounds (X = Hal, OCOR, and other “good leaving” groups) is a fundamental and energetically favorable route to carboxylic acid derivatives. When water, alcohols and ammonia are used as nucleophiles, carboxylic acids, esters and amides (or nitriles) are obtained, respectively. On the other hand, the same products are derived from aldehydes upon their catalytic aerobic oxidation, on condition that water, alcohols and ammonia are present in the feed gas. Therefore, one can surmise that nucleophilic substitution reactions are involved intrinsically in the catalytic oxidation reactions. In agreement with this hypothesis we have shown, as an example, that the selfsame catalyst, MoVTeNb mixed oxides, enables successful oxidation, oxidative esterification and ammoxidation of acrolein. In addition, the concept was considered in the view of established organic and general chemistry principals.