First multicomponent reaction exploiting glycerol carbonate synthesis. (20th November 2018)

• Record Type: Journal Article
• Authors: Costanzo, Paola; Calandruccio, Carla; Di Gioia, Maria Luisa; Nardi, Monica; Oliverio, Manuela; Procopio, Antonio
• Is Part Of: Journal of cleaner production. Volume 202(2018)
• Page Start: 504
• Page End: 509
• Publication Date: 2018-11-20
• Subjects: Ammonia recicle -- Heterogeneous catalysis -- Multicomponent reactions -- Glycerol carbonate -- 1, 4-Dihydropyridines -- Q-tube reactor -- Hantzsch reaction; GLY glycerol -- GC glycerol carbonate -- 1, 4-DHPs 1, 4-dihydropyridines; Factory and trade waste -- Management -- Periodicals; Manufactures -- Environmental aspects -- Periodicals; Déchets industriels -- Gestion -- Périodiques; Usines -- Aspect de l'environnement -- Périodiques; 628.5
• DOI: 10.1016/j.jclepro.2018.08.120
• Languages: English
• ISSNs: 0959-6526

Abstract

Abstract: The first example of the use of ammonia, the waste material of the bulk glycerol carbonate (GC) production, for the formation of another valuable organic molecule, a 1, 4-dihydropyridine (1, 4-DHP), by an in line two reactor system was presented. Two Q-tube reactors, one for the urea glycerolysis and the other for the Hantzsch reaction, were used, connected through a PTFE tube. Urea glycerolysis using La2 O3 as heterogeneous catalyst, under N2 pressure or in vacuum conditions, was optimized. A catalyst free and organic solvent free condition was selected to realize a Hantzsch reaction in an ecofriendly way. Glycerol carbonate and a 1, 4-dihydropyridine were synthesized in two subsequent reactions, converting wastes into added value products. The best result was that glycerol carbonate was obtained at 36% with 77% of selectivity, and at the same time the Hantzsch product was synthesized with a 75% of yield. Graphical abstract: Image 1 Highlights: Ammonia, a waste from urea glycerolysis, was recycled in a multicomponent reaction. Two Q-tube reactors were connected in line to realize an "in cascade" reaction. The first reliable way to valorize glycerol and urea for the contemporary synthesis of GC and 1, 4-DHP was reported.