The Radiation Chemistry of Cyclopentane

Heavy Ion Radiolysis of Cyclopentane

“…Several groups have investigated the y-ray or fast electron radiolysis of cyclopentane,1-9 but there has been only one published report10 on the heavy ion (3 MeV 210Po a-ray) radiolysis of this compound. Irradiation of cyclopentane with heavy particles of high linear energy transfer (LET = -dE/dx, stopping power) is expected to have a significant effect on product yields because of the increased importance of intratrack radical reactions as compared to radical diffusion and reaction in the bulk medium.…”

“…Cyclopentane also has a much higher tendency for ring decomposition than cyclohexane or cyclooctane. [3][4][5][6][7][8][9] The main product of this ring decomposition is 1-pentene, but other C5 ring opening products and lower molecular weight scission products are also formed.…”

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The radiolysis of neat and iodine solutions of cyclopentane has been performed with [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] MeV helium ions, 12-31 MeV carbon ions, and 22-32 MeV oxygen ions. The yields of the major products cyclopentene, bicyclopentyl, 1-pentene, and cyclopentyl iodide as well as the yields of a few select minor products have been determined.

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Radical Reactions in the Radiolysis of Cyclopentane

“…Figures [3][4][5] use the same general scheme to describe the mechanism of hydrogen formation in all three cycloalkanes. Closer inspection of the data, however, reveals large differences between them.…”

Photolysis and radiolysis of cyclopentane in the liquid phase

“…From Figure 4, it can be estimated that a molecule excited by 8.7-eV photons would undergo processes [6][7][8][9] with the following probabilities: process 6, 0.22; process 7, 0.49; process 8,0.22; process 9, 0.05. If it is assumed that in the photolysis with 10.0-and 11.6-eV photons, respectively, 27 and 40% of the molecules dissociate according to this pattern, as derived above, then the approximate quantum yields which could be attributed to the modes of dissociation of a molecule directly excited by 10.0-and 11.6-eV photons are as follows:…”