KINETIC-STUDIES OF OH REACTIONS WITH ISOPROPYL, ISOBUTYL, SEC-BUTYL, AND TERT-BUTYL ACETATE

The temperature dependence of the rate coefficients for the OH radical reactions with iso-propyl acetate (k(1)), iso-butyl acetate (k(2)), s ec-butyl acetate (k(3)), and tert-butyl acetate (k(4)) have been deter mined over the temperature range 257-372 K. The Arrhenius expressions obtained are: k(1) = (0.30 +/- 0.03) x 10(-12) exp[(770 +/- 52)/T]; k( 2) = (1.09 +/- 0.14) X 10(-12) exp[(534 +/- 79)/T]; k(3) = (0.73 +/- 0 .08) X 10(-12) exp[(640 +/- 62)/T]; and k(4) = (2.22 +/- 0.34) X 10(-1 2) exp[-(395 +/- 92)/T] (in units of cm(3) molecule(-1) s(-1)). At roo m temperature, the rate constants obtained (in units of 10(-12) cm(3) molecule(-1) s(-1)) were as follows: iso-propyl acetate (3.77 +/- 0.29 ); iso-butyl acetate(6.35 +/- 0.52); sec-butyl acetate (6.04 +/- 0.58) ; and tert-butyl acetate (0.56 +/- 0.05). Our results are compared wit h the previous determinations and discussed in terms of structure-acti vity relationships. (C) 1997 John Wiley & Sons, Inc.