1967 Volume 40 Issue 9 Pages 2081-2085
The γ-radiolysis of 1,4-cyclohexadiene vapor has been investigated at room temperature. The gaseous products are hydrogen, acetylene, and 1,3-butadiene. Benzene, cyclohexene, 1,3-cyclohexadiene, and 1,3,5-hexatriene are identified as the low volatile liquid products. The yield of each product is almost independent of the dose (0.87–9.11)×1019 eV, while it is remarkably dependent on the gas pressure (8–56 mmHg). The G values of hydrogen, the C2+C4 gas fraction, benzene, and cyclohexene are 1.95, 1.25, 28.5, and 14.0 respectively at 42 mmHg. The large yields of benzene and cyclohexene may be explained in terms of a chain mechanism. The pressure dependence of these products is very similar in both the Hg-sensitized photolysis and the γ-radiolysis of this diene vapor. The presence of the long-lifetime intermediates is as expected. The experiments with nitric oxide added as a radical scavenger suggest that the main path of hydrogen formation is the radical process.
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