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The volumes of activation and of reaction were measured for the reaction between sulphur dioxide and 2,3‐dimethylbuta‐1,3‐diene to form 3,4‐dimethylsulpholene. Values of Δ V and Δ V * are −33 and −35 cm 3 mol −1 , respectively in accordance with a concerted reaction having a very product‐like transition state.
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Isaacs et al. (1994) studied this question.
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