Reactions of recoil 80Br activated by the (n, .GAMMA.) process with some gaseous cyclanes (C4-C6).

概要

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The reactions of 80Br from the (n,γ) process with cyclanes (C4–C6) have been systematically investigated. The primary products formed by the 80Br-for-H reaction were excited and underwent at least two modes of unimolecular decomposition. One was the elimination of the H80Br molecule, and the other was the cleavage of the ring, giving the corresponding bromo-olefin and olefin. The former process was important particularly in the lower-pressure end. Thus, the reaction was easily suppressed by increasing the pressure. However, the latter process showed a different feature; that is, the yields of the decomposition products stayed at an almost constant level over the whole pressure range studied. This indicates that a highly excited product decomposes preferentially through a ring-cleavage reaction. When the total organic yield from each reaction system was plotted against the carbon number of the reactant molecules, a linear correlation was obtained. After some possible consideration, it was concluded that the life of the intermediate complex might play a more important role in the reaction of 80Br with cyclanes than the other factors. Some considerations about the radiolysis of the reactant molecule are also mentioned.
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