Heating and stirring: Heating and stirring was carried out on RCT 5 digital hotplates (IKA) coupled with PT-100 temperature probes and equipped with exchangeable solid heating blocks with different inlays suitable for flasks with a volume ranging from 10 mL to 250 mL. For cooling down the reaction flask after the reaction, axial fans (Sunon, 12V DC) were installed next to each hotplate.