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The isotope effect in the hydrogen abstraction from formaldehyde by hydrogen atoms has been measured. The activation energy difference derived from relative rate measurements of the pair of reactionsH+H2CO→H2+HCOH+D2CO→HD+DCOis E5 — E2 = 1.0 kcal. The value for the corresponding pair D+H2CO→HD+HCOD+D2CO→D2+DCOE7 — E6 = 0.9 kcal, is calculated from (5), (2), and the variation of the hydrogen-deuterium equilibrium constant with temperature. Application of the Bigeleisen theory of the isotope effect to these reactions suggests a loosely bound activated complex.
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McNesby et al. (1960) studied this question.
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