Kinetic study of the reaction of OH with a series of acetals at 298 +/- 4 K

Rate coefficients have been measured at 298 +/- 4 K and 1000 mbar total pre ssure for the reactions of OH with a series of symmetrical acetals (R-O-CH2 -O-R, R = C-1 to C-4) using a relative kinetic technique. The investigation s have been performed in a laboratory photoreactor and also in the large ou tdoor EUPHORE simulation chamber facility in Valencia, Spain. The following rate coefficients (in units of 10(-11) cm(3) molecule(-1) s(-1)) have been obtained: dimethoxy methane (R = CH3), 0.49 +/- 0.02; diethoxy methane (R = CH3CH2), 1.84 +/- 0.18; di-n-propoxy methane (R = CH3CH2CH2), 2.63 +/- 0. 49; di-iso-propoxy methane (R = (CH3)(2)CH), 3.93 +/- 0.48; di-n-butoxy met hane (R = CH3CH2CH2CH2), 3.47 +/- 0.42; di-iso-butoxy methane (R = (CH3)(2) CHCH2), 3.68 +/- 0.57; di-sec-butoxy methane (R = CH3CH2C(CH3)H), 4.68 +/- 0.05. (C) 1999 John Wiley & Sons, Inc.