Important information about the geometry of the transition state is contained in the activation volume ΔV≠ obtained from the pressure dependence of the reaction rate, which in the title reactions allows a correlation to be drawn between the size of the activation volume and the number of new interactions in the cyclic transition states. Every additional five‐ or six‐membered ring formed in the transition state contributes about −10 to −12cm3mol−1 to ΔV≠.
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Diedrich et al. (1994) studied this question.
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