Ethyl bromide decomposition

Under appropriate conditions the decomposition of ethyl bromide may be explained by the following mechanism. 

Lin et al. (162, 193) also obtained a similar spectrum by decomposition of ethyl bromide on Cu(100), but with poorer resolution in the 900-cur1 region. This spectrum does, however, show a much lower wavenumber vCCu mode at 370 cm-1 than that for vCPt at 484 cm 1. This difference between the two metals is similar to that found from the spectra of the adsorbed methyl species. 

The two parallel thermal decompositions of bromopropane-1,1,2,2-d4, together with the decomposition of ethyl bromide, have been investigated by using the very low-pressure pyrolysis (VLPP) method107 (equations 20 and 21). 

Fig. 17.—Pressure-time curves for the decomposition of ethyl bromide.

Different Methods of Calculating k for the Decomposition of Ethyl Bromide ifeXlO4 sec-1 at 305°... 

Fig. 19.—Effect of decreased pressure on the specific decomposition rate of ethyl bromide.

Again the decomposition of the ethyl bromide might take place by the rupture into free radicals and the recombination to give the final products ethylene and hydrobromic acid... 

This extended discussion of the decomposition of ethyl bromide has shown the difficulty of definitely assigning a single mechanism to a reaction. Perhaps still further experiments will enable... 

In studying the connections between chemical kinetics and infrared vibration frequencies the ethyl halides were chosen because the kinetics of the decomposition of ethyl bromide had been the object of such an extended investigation.7 In attempting to... 

Apart from the molecular and the radical-chain mechanisms for the decomposition of halogenated hydrocarbons, the study of allyl bromide pyrolysis " revealed a third possibility, namely a radical non-chain mechanism, a type originally proposed by Daniels and Veltman for ethyl bromide pyrolysis. Its application to allyl bromide pyrolysis is shown in the following scheme as proposed by Maccoll ... 

This should be a reasonably facile step, and the replacement of an j-radical by a bromine atom in this way may account in part for the catalytic action of HBr in these systems. Incorporating these steps, Maccoll has proposed the following as a possible chain mechanism of the thermal decomposition of ethyl bromide... 

The overall reaction is close to first-order for ethyl bromide (see however ref. 66), but in the case of n-propyl bromide decomposition Agius and MaccolP have reported an overall order of 1.5. Recently Cross and Stimson have accounted for the latter behaviour in terms of a decomposition which is second-order in... 

The decomposition of acetaldehyde, sensitized by biacetyl, was studied at 499 °C by Rice and Walters , and between 410 and 490 °C by Boyer et al. They found the initial rate to be proportional to the square root of the biacetyl concentration and to the first power of the aldehyde concentration. The chains are initiated by the radicals originating from the decomposition of the biacetyl molecule. The decomposition of acetaldehyde can be induced also by di-r-butyl peroxide (at 150-210 °C, about 10-50 molecules decompose per peroxide molecule added), as well as by ethylene oxide (around 450 °C each added ethylene oxide molecule brings about the decomposition of up to 300 acetaldehyde molecules). For the influence of added diethylether, vinyl ethyl ether, ethyl bromide, and ethyl iodide etc., see Steacie °. 

This product is formed by the action of tin dimethyl dibromide on a solution of disodium dimethyl stannane. The compound is readily soluble, and chemically very active. With ethyl bromide the two sodium atoms are replaced by ethyl groups, forming EtSnMeg.SnMeg. SnMeaEt. This substance is not stable in air, oxidation slowly taking place. It may be distilled under reduced pressures at a temperature of from 80° to 100° C., but some decomposition occurs. 

Ethylphenyl Carbinol. Employ the same procedure as in section (A). Use ethyl bromide 4.4 g magnesium 1.0 g ether 10 ml and benzaldehyde 4.25 ml. The ether extract, after the decomposition of the addition compound, is shaken with 5 ml of saturated sodium bisulfite solution to remove the unreacted benzaldehyde, with which it forms a crystalline compound. The upper layer is... 

The decomposition of ethyl bromide in the gas phase is a first-order reaction. The data are ... 

The sequence of steps of the catalyzed decomposition of ethyl bromide is written as... 

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