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Theoretical investigation of linalool oxidation.

Carina Bäcktorp ; J R Tobias Johnsson Wass ; Itai Panas (Institutionen för kemi- och bioteknik, Oorganisk miljökemi) ; Maria Sköld ; Anna Börje ; Gunnar Nyman
The journal of physical chemistry. A (1089-5639). Vol. 110 (2006), 44, p. 12204-12.
[Artikel, refereegranskad vetenskaplig]

This study concerns the autoxidation of one of the most used fragrances in daily life, linalool (3,7-dimethyl-1,6-octadien-3-ol). It reacts with O2 to form hydroperoxides, which are known to be important contact allergens. Pathways for hydroperoxide formation are investigated by means of quantum mechanical electronic structure calculations. Optimized molecular geometries and harmonic vibrational frequencies are determined using density functional theory (DFT). Insight into how the addition of O2 to linalool occurs is obtained by establishing a theoretical framework and systematically investigating three smaller systems: propene, 2-methyl-2-butene, and 2-methyl-2-pentene. 2-Methyl-2-pentene was chosen as a model system and used to compare with linalool. This theoretical study characterizes the linalool-O2 biradical intermediate state, which constitutes a branching point for the further oxidation reactions pathways. Thus, the observed linalool oxidation product spectrum is discussed in terms of a direct reaction path, the ene-type mechanism, and the radical mechanism. The major hydroperoxide found in experiments is 7-hydroperoxy-3,7-dimethyl-octa-1,5-diene-3-ol, and the calculated results support this finding.

Nyckelord: Alkenes, chemistry, Computer Simulation, Fatty Alcohols, chemistry, Free Radicals, chemistry, Insecticides, chemistry, Models, Chemical, Molecular Structure, Monoterpenes, chemistry, Oxidation-Reduction, Quantum Theory



Denna post skapades 2007-10-18. Senast ändrad 2011-01-20.
CPL Pubid: 54984

 

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Institutioner (Chalmers)

Institutionen för kemi (2001-2011)
Institutionen för kemi- och bioteknik, Oorganisk miljökemi (2005-2014)

Ämnesområden

Fysikalisk kemi

Chalmers infrastruktur