The IL/catalyst systems mentioned in the title have been applied to the lactamisation of ω-aminocarboxylic acids and other condensation reactions.

Hexaalkylguanidinium Salts as Ionic Liquids -Applications in Titanium andAluminium Alcoholate Assisted Synthesis. -Guanidinium-based ionic liquids containing titanium or aluminum alcoholate are successfully applied as Lewis-acidic catalytic media for some dehydrating cyclocondensation reactions: i. e., lactamization of -aminocarboxylic acids, direct amidation of carboxylic acids, synthesis of oxazolines from carboxylic acids and 2-aminoethanol, lactonization of 6-hydroxyhexanoic acid, and Paal-Knorr synthesis of pyrroles. -(ARKHIPOVA, M.; EICHEL, S.; MAAS*, G.; RSC Adv. 4 (2014) 99, 56506-56517, http://dx.