A catalyst don’t appear in the overall stoichiometry of the reaction it catalyzes, but it must appear in at least one of the elementary reactions in the mechanism for the catalyzed reaction. 18997-19-8, Name is Chloromethyl pivalate, molecular formula is C6H11ClO2. In an article, author is Hu, Mingxi,once mentioned of 18997-19-8, Safety of Chloromethyl pivalate.
Ozonolysis of unsaturated organic species with water produces a-hydroxyalkylhydroperoxides (alpha-HHs), which are reactive intermediates that lead to the formation of H2O2 and multifunctionalized species in atmospheric condensed phases. Here, we report temperaturedependent rate coefficients (k) for the aqueous-phase decomposition of alpha-terpineol alpha-HHs at 283-318 K and terpinen-4-ol alpha a-HHs at 313-328 K. The temporal profiles of alpha-HH signals, detected as chloride adducts by negative-ion electrospray mass spectrometry, showed single-exponential decay, and the derived first-order k for alpha-HH decomposition increased as temperature increased, e.g., k(288 K) = (4.7 +/- 0.2) X 10(-5), k(298 K) = (1.5 +/- 0.4) X 10(-4), k(308 K) = (3.4 +/- 0.9) X 10(-4), k(318 K) (1.0 +/- 0.2) X 10(-3) s(-1) for alpha-terpineol alpha-HHs at pH 6.1. Arrhenius plot analysis yielded activation energies of 17.9 +/- 0.7 (pH 6.1) and 17.1 +/- 0.2 kcal mol(-1) (pH 6.2) for the decomposition of alpha-terpineol and terpinen-4-ol alpha-HHs, respectively. Activation energies of 18.6 +/- 0.2 and 19.2 +/- 0.5 kcal mol(-1) were also obtained for the decomposition of alpha-terpineol alpha-HHs in acidified water at pH 5.3 and 4.5, respectively. Theoretical kinetic and thermodynamic calculations confirmed that both water-catalyzed and proton-catalyzed mechanisms play important roles in the decomposition of these alpha-HHs. The relatively strong temperature dependence of k suggests that the lifetime of these alpha-HHs in aqueous phases (e.g., aqueous aerosols, fog, cloud droplets, wet films) is controlled not only by the water content and pH but also by the temperature of these media.
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Reference:
Chloride – Wikipedia,
,Chlorides – an overview | ScienceDirect Topics