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The Diels-Alder reaction of thiophene with maleic anhydride has been investigated under conditions of very high pressure. The Diels-Alder adduct was obtained in dicbloromethane at 100 °C and 15 kbar; above a pressure of 15 kbar the reaction was highly accelerated. From the spectral data and chemical evidence it has been suggested that the adduct has the exo-configuration. The reactions in various solvents and with other dienophiles have also been examined.
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Kotsuki et al. (1979) studied this question.
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