Perhydropyrimidinylium and 1,3-diazepinylium salts as potential ionic liquids

Abstract

Saturated or partially saturated heterocyclic compounds were uncovered as interesting and potential ionic liquid media. Zwitterionic compounds with perhydropyrimidinylium, 1,3-diazepinylium and quinazolinylium carbocations were utilized in the preparation of a variety of salts in order to search for new low-melting ionic media. Some of the zwitterionic quinazoline derivatives were also found to be low-melting glasses.

A New Way to Quinazolines, Perimidines and Dibenzo[d,f][1,3]Diazepines

“…All these facts indicate that zwitterionic forms of 4a,b are preferred. The structure of the product 4a (in the form of its hydrochloride) was additionally confirmed by X-ray analysis, 10 which clearly showed the presence of a stabilised cationic centre C6 (Fig. 1).…”

Facile and Highly Efficient N-Formylation of Amines Using a Catalytic Amount of Iodine under Solvent-Free Conditions

“…Previously, the N-formylation of anilines with electron-withdrawing groups was found to be difficult. 22 Secondary aryl amines were also good substrates for the reaction, affording high yields of the corresponding formamides (entries 5-7). The reactions with aliphatic primary and secondary amines resulted in high product yields (entries 8-14).…”