简介:AnovelBrфnstedacidicionicliquid(IL)basedonthecyclicguanidiniumcationhasbeensynthesized.ThisIL,asastrongBrфnstedacidcatalystorsolvent,showshighcatalyticactivityandbiphsaicbehavorintheesterificationsofcarboxylicacidsandalcohols.TheproducedestersasaseparatephasecanbeconvenientlydecantedoutfromtheILandtheILisrecyclablewithoutanylossofcatalyticactivity.