E Aromatic Alcohols

Sprensen et al. (2002) conducted experiments that showed that the presence of 500-8,000 fig m NaCl or NH4NO3 aerosols (levels which far exceed those found in the atmosphere) does not affect the reactivity of OH with phenol. 

Berndt and Edge (2003) investigated the pr(xlucts of the reaction of OH with phenol in flow tube experiments (at 100 mbar in presence and absence of O2 and different concentrations of NO , ) at temperatures in the range 266-364 K. Catechol was found to be the main product under all experimental conditions its molar yield increased from 0,37 0.06 at 266 K to 0.87 0.04 at 364 K. Other products observed were p-benzoquinone, o-nitrophenol, 3-nitrocatechol, and p-nitrophenol. For NO2 concentrations (3 - 4) X 10 molecule cm and room temperature, the molar yields of catechol found, 0.73-0.78, were in good agreement with the chamber results of Olariu et al. (2002), who reported 0.804 0.121 obtained using a smog chamber study. 

The kinetics of the reaction of NO3 with phenol have been studied by Carter et al. (1981), Atkinson et al. (1984b, 1992a), and Bolzacchini et al. (2001). Table H-E-2 summarizes the reported data. The measurements from Carter et al. (1981) and that of Atkinson et al. (1984b) using the equilibrium constant ofN02+N03 N2O5 seem 

The lifetime of phenol with respect to the reaction of OH and NO3 is less than 4 h. The reaction of OH with phenol may proceed through three different pathways  

The relative importance of these channels depends on the temperature. The available kinetic and mechanistic data indicate that for the atmospherically relevant temperature range, the reactions proceed essentially through channels (1) and (3). H-atom abstraction from the —OH group (channel 1) accounts for about 12% of the reaction at 298 K and less at lower temperatures. It has been reported that the reaction of OH with phenol leads to 2-nitrophenol ( 6%) in the presence of NO at 298 K (Atkinson et al., 1992b Platz et al., 1998 Olariu et al., 2002). The observed yield of 2-nitrophenol shows that at least 6% of the reaction goes through H-atom abstraction from the —OH group. 

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