Relative kinetic techniques have been used to measure
the rate
coefficients 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 compounds
with OH are the following (in units of 10–11 cm3 molecule–1 s–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 Cl
atoms the rate coefficients are as follows (in units of 10–10 cm3 molecule–1 s–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. The
reported error is twice the standard deviation. Product studies of
the reactions were performed using multipass in situ FTIR (Fourier
transform 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 reaction
products.