Abstract
It was found that radiation-induced addition of acetaldehyde to ethylene occurs at room temperature with a relatively high G(-C/sub 2/H/sub 4/), e.g., 4000 at the initial pressure of 50 kg/cm/sup 2/ of ethylene, and that the production of 1: 2 telomer is more favorable than that of 1: 1 telomer at higher pressure of ethylene. In order to obtain higher G values of 1: 1 telomer, it is shown to be unnecessary to make the initial pressure of ethylene higher than 10 kg/cm/sup 2/, and also to elevate the irradiation temperature much higher than room temperature. It was confirmed that a major part of the telomerization proceeds by a chain mechanism, which accompanies a chain-transfer process simuitaneously, acetyl radical playing a role of the chain-carrying radical as well as role of initiator. Moreover it is pointed out that the acetyl radical reacts with ethylene more easily than decomposes, though the decomposition is assumed to occur dominantly in the photochemical and thermal decomposition of acetaldehyde alone. (auth)
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