Kinetics and Mechanismsof the Tropospheric Reactionsof Menthol, Borneol, Fenchol, Camphor, and Fenchone with HydroxylRadicals (OH) and Chlorine Atoms (Cl).

Relative kinetic techniques have been used to measurethe ratecoefficients for the reactions of oxygenated terpenes (menthol, borneol,fenchol, camphor, and fenchone) and cyclohexanol with hydroxyl radicals(OH) and chlorine atoms (Cl) at 298 ± 2 K and atmospheric pressure.The rate coefficients obtained for the reactions of the title compoundswith OH are the following (in units of 10–11cm3molecule–1s–1): (1.48± 0.31), (2.65 ± 0.32), (2.49 ± 0.30), (0.38 ±0.08), (0.39 ± 0.09) for menthol, borneol, fenchol, camphor,and fenchone, respectively. For the corresponding reactions with Clatoms the rate coefficients are as follows (in units of 10–10cm3molecule–1s–1): (3.21 ± 0.26), (3.40 ± 0.28), (2.72 ± 0.13), (2.93± 0.17), (1.59 ± 0.10), and (1.86 ± 0.29) for cyclohexanol,menthol, borneol, fenchol, camphor, and fenchone, respectively. Thereported error is twice the standard deviation. Product studies ofthe reactions were performed using multipass in situ FTIR (Fouriertransform infrared spectroscopy) and solid-phase microextraction (SPME)with analysis by GC–MS (gas chromatography–mass spectrometry).A detailed mechanism is proposed to justify the observed reactionproducts. [ABSTRACT FROM AUTHOR]