Radiation Chemistry And Photochemistry of Ethyl Bromide in the Gas Phase / By Arthur Jesse Frank
Radiation Chemistry And Photochemistry of Ethyl Bromide in the Gas Phase / By Arthur Jesse Frank
Frank, Arthur Jesse
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•CHBr' + Br 2 — > CHBr 3 R-37 Since about 56% of bromoform is scavenged by oxygen, it must be formed in part by hot processes. The G value of C-C bond breakage may be roughly estimated to be 0.09 from one half of the sum of the 100 e.v. C-i yields in the dose 20 20 range of 1.0 x 10 to 1.5 x 10 e.v. /gram. Since G(-C ? HrBr) is 6.31 in this dose range, about 1,4% of all ethyl bromide molecules consumed undergo C-C bond fission. The G value of 1 ,1 -dibromoethane is about 6 times larger than tha...t of 1 ,2-dibromoethane presumably as a result of the same set of reactions as discussed for the photolysis. CH 3 CHBr + HBr ► CH 3 CH 2 Br + Br 1 R-38-P 'CH 2 CH 2 Br + HBr ► CH 3 CH 2 Br + Br' R-39-P CH 3 CHBr + Br 2 ► CH 3 CHBr 2 + Br' R-40-P CH 2 CH 2 Br + Br 2 — ► CH 2 BrCH 2 Br + Br' R-41-P 173 In the gas phase radiolysis of ethylene and hydrogen bromide, ethyl 5 bromide is formed with an ion-pair yield of 10 , The high ethyl bromide yield is accounted for in part by reaction R-39-P (62), Oxygen inhibits almost completely the 1 ,1 -dibromoethane formation in accordance with the proposed radical mechanism.
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