Diels-Alder diene synthesis reactions are effected in the presence of at least one liquid quaternary ammonium or phosphonium salt of formula Q+.A- (I). Q = quaternary ammonium or phosphonium; A = anion. (I) is preferably N-butyl pyridinium hexafluorophosphate, N-ethyl pyridinium tetrafluoroborate, tetrabutyl phosphonium tetrafluoroborate, 3-butyl-1-methyl imidazolium hexafluoroantimonate, hexafluorophosphate or trifluoromethyl sulphonate, pyridinium fluorosulphonate, trimethyl phenyl ammonium hexafluorophosphate, 3-butyl-1-methyl imidazolium dichlorocuprate, pyridinium tetrachloroborate or 3-butyl-1-methyl imidazolium tetrachloroaluminate or trichlorozincate.
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机译：Diels-Alder二烯合成反应在至少一种式Q + .A-（I）的液体季铵盐或phospho盐的存在下进行。 Q =季铵或phospho; A =阴离子。 （I）优选为六氟磷酸N-丁基吡啶鎓，四氟硼酸N-乙基吡啶鎓，四氟硼酸四丁基鎓，六氟锑酸3-丁基-1-甲基咪唑鎓，六氟磷酸酯或三氟甲基磺酸酯，氟磺酸吡啶鎓，三氟苯基苯基六氟磷酸铵，3-丁基-1-甲基咪唑鎓二氯铜酸酯，吡啶鎓四氯硼酸酯或3-丁基-1-甲基咪唑鎓四氯铝酸酯或三氯锌酸酯。
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