Co(II) catalysed oxidation of alpha-pinene by molecular oxygen Part III

Authors
Citation
Mk. Lajunen, Co(II) catalysed oxidation of alpha-pinene by molecular oxygen Part III, J MOL CAT A, 169(1-2), 2001, pp. 33-40
Citations number
26
Categorie Soggetti
Physical Chemistry/Chemical Physics
Journal title
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
ISSN journal
13811169 → ACNP
Volume
169
Issue
1-2
Year of publication
2001
Pages
33 - 40
Database
ISI
SICI code
1381-1169(20010328)169:1-2<33:CCOOAB>2.0.ZU;2-M
Abstract
Herein are described the results of t-BuOOH aided air oxidations of (-)-alp ha -pinene, catalysed by [Co(pyridine)(2)Br-2] or [Co(4-methylpyridine)(2)B r-2], and observations about the nature of the reactions. The use of a smal l amount of t-BuOOH showed a clear beneficial influence on air oxidation un der mild temperatures. Raising the temperature did not increase yields mark edly. An increase of the hydroperoxide concentration sped up air oxidation and brought up the amount of oxidised products, especially allylic ones. Th e oxygen atom in oxidised products was not derived from peroxide. Instead, the reaction needed the presence of molecular oxygen to proceed. The presen t air oxidation is a homogeneous catalytic reaction, and the formation of v erbenone took place via trans-verbenol. (C) 2001 Elsevier Science B.V. All rights reserved.