Abstract
AbstractThe rate of the thermal cycloaddition of ethylene to cis and trans butene‐2 has been measured at 693°K and at pressures of about 12 atmospheres. The ratio of trans‐ to cis‐1,2‐dimethylcyclobutane from the reaction of trans‐butene‐2 with ethylene was 5.1, obtained from the initial rates of formation of the products. Similarly, the ratio of cis‐ to trans‐1,2‐dimethyl‐cyclobutane from the reaction of cis‐butene‐2 with ethylene was 2.8. The results show that the cycloaddition reactions are the reverse of the decomposition reactions of the dimethyl‐cyclobutanes and may be interpreted in terms of a biradical intermediate. Several ratios of rate constants have been measured as well as the rate constants for the reaction of the olefins to form the intermediate biradical.
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