757-88-0Relevant articles and documents
Kinetics and Mechanism of the Atmospheric Oxidation of Tertiary Amyl Methyl Ether
Smith, D. F.,Mciver, C. D.,Kleindienst, T. E.
, p. 453 - 472 (2007/10/02)
Tertiary-amyl methyl ether (TAME) is proposed for use as an additive to increase the oxygen content of gasoline as stipulated in the 1990 Clean Air Amendments.The present experiments have been performed to examine the kinetics and mechanisms of the atmospheric removal of TAME.The kinetics of the reaction of OH with TAME was examined by using a relative rate technique in which photolysis of methyl nitrite or nitrous acid was used as the source of OH.The OH rate constant for TAME and two major products (t-amyl formate and methyl acetate) were measured and yields for ten products were determined as primary products from the reaction.Values determined for the rate constants for the reaction with OH were 5.48*10-12 (TAME), 1.75*10-12 (t-amyl formate), and 3.85*10-13 cm3 molec-1 s-1 (methyl acetate) at 298 +/- 2 K.The primary products (with corrected yields where required) from the OH + TAME that have been observed include (1) t-amyl formate (0.366), methyl acetate (0.349), acetaldehyde (0.43, corrected), acetone (0.036), formaldehyde (0.549), t-amyl alcohol (0.026), 3-methoxy-3-methylbutanal (0.044, corrected), t-amyloxy methyl nitrate (0.029), 3-methoxy-3-methyl-2-butyl nitrate (0.010), and 2-methoxy-2-methyl butyl nitrate (0.004).Mechanisms leading to these products involve OH abstraction from each of the four different hydrogen atoms of TAME.
Reaction of the Nitrate Radical with Some Potential Automotive Fuel Additives. A Kinetic and Mechanistic Study
Langer, Sarka,Ljundstroem, Evert
, p. 5906 - 5912 (2007/10/02)
Rate coefficients for the reaction of NO3 with ethyl tert-butyl ether (ETBE), diisopropyl ether (DIPE), and tert-amyl methyl ether (TAME) have been determined.Absolute rates were measured at temperatures between 257 and 367 K using the fast flow-discharge (FFD) technique.Relative rate experiments were also performed at 295 K in a reactor equipped with White optics and using FTIR spectroscopy to follow the reactions.Rate data from FFD experiments can be presented as follows: kETBE=(2.48 +/-0.78)E-12exp, kDIPE=(2.02 +/-0.35)E-12exp, and kTAME=(1.21 +/-0.22)E-12exp (in units of cm3 molecule-1 s-1).The rate coefficients at room temperature from the FFD experiments are in goog agreement with the corresponding rate coefficients from the relative experiments.Products from simulated atmospheric oxidation of the investigated ethers, initiated by the reaction with nitrate radical, were identified using FTIR spectroscopy.The degradation of ETBE results in tert-butyl formate, tert-butyl acetate, formaldehyde, and methyl nitrate, that of DIPE in acetone, isopropyl nitrate, isopropyl acetate, and formaldehyde, and that of TAME in tert-amyl formate, formaldehyde, and tert-amyl nitrate.
Free-radical transformations of di-tert-alkoxymethanes in the absence of solvent and in chloroform
Rol'nik, L. Z.,Kalashnikov, S. M.,Pastushenko, E. V.,Zlotskii, S. S.,Rakhmankulov, D. L.
, p. 614 - 618 (2007/10/02)
In chloroform in the presence of tert-butyl peroxide di-tert-alkoxymethanes from the corresponding tert-alkyl formates, tert-alkyl chlorides, and alkanes; here the chloroform is converted into methylene chloride and 1,1,2,2-tetrachloroethane.The relationships between the accumulation rate of the reaction products and the concentration of acetal, chloroform, and initiator were determined.An unbranched radical-chain mechanism was established for the fragmentation of the acetals with quadratic termination at the tert-alkyl and dichloromethyl radicals.
