Kinetics of oxidative decarboxylation of 3,4-methylenedioxymandelic acid to piperonal with dilute nitric acid / Hongjuan Xi in Industrial & engineering chemistry research, Vol. 48 N° 23 (Décembre 2009)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 48 N° 23 (Décembre 2009) . - pp. 10425–10430 Titre : Kinetics of oxidative decarboxylation of 3,4-methylenedioxymandelic acid to piperonal with dilute nitric acid Type de document : texte imprimé Auteurs : Hongjuan Xi, Auteur ; Zhixian Gao, Auteur ; Jianguo Wang, Auteur Année de publication : 2010 Article en page(s) : pp. 10425–10430 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Kinetics--Oxidative--Decarboxylation--3,4-Methylenedioxymandelic--Acid--Piperonal--Dilute Nitric Résumé : The oxidative decarboxylation of 3,4-methylenedioxymandelic acid (DMA) to piperonal with dilute nitric acid was investigated. This reaction was initiated by NaNO2 and catalyzed by H2SO4, but the autocatalytic behavior, which was noted in most nitric acid oxidation reactions, was not observed. Detailed kinetic study showed that the respective reaction orders of NaNO2, H2SO4, HNO3, and DMA were 0.5, 0.5, 1.2, and 1.8, and the activation energy was 59.65 kJ/mol. The gained reaction rate equation provided a good model for the reaction under other temperatures and even the condition of a slightly higher concentration of nitric acid. Additional experimental data suggested that HNO2 was the reactive species. On the basis of the results, a possible reaction mechanism was proposed. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900961r [article] Kinetics of oxidative decarboxylation of 3,4-methylenedioxymandelic acid to piperonal with dilute nitric acid [texte imprimé] / Hongjuan Xi, Auteur ; Zhixian Gao, Auteur ; Jianguo Wang, Auteur . - 2010 . - pp. 10425–10430. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 23 (Décembre 2009) . - pp. 10425–10430 Mots-clés : Kinetics--Oxidative--Decarboxylation--3,4-Methylenedioxymandelic--Acid--Piperonal--Dilute Nitric Résumé : The oxidative decarboxylation of 3,4-methylenedioxymandelic acid (DMA) to piperonal with dilute nitric acid was investigated. This reaction was initiated by NaNO2 and catalyzed by H2SO4, but the autocatalytic behavior, which was noted in most nitric acid oxidation reactions, was not observed. Detailed kinetic study showed that the respective reaction orders of NaNO2, H2SO4, HNO3, and DMA were 0.5, 0.5, 1.2, and 1.8, and the activation energy was 59.65 kJ/mol. The gained reaction rate equation provided a good model for the reaction under other temperatures and even the condition of a slightly higher concentration of nitric acid. Additional experimental data suggested that HNO2 was the reactive species. On the basis of the results, a possible reaction mechanism was proposed. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900961r

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