Download PDF Opens in a new window. Article suggestions will be shown in a dialog on return to ScienceDirect. ... Please enable JavaScript to use all the features on this page. ... Knoevenagel condensation proceeds efficiently in recyclable [bmim]PF 6 and [bmim]BF 4 without any catalyst, and hydrotalcites in ionic liquid serve as a safe and recyclable reaction system for both Knoevenagel as well as nitroaldol condensations. ... Knoevenagel condensation ...