INVESTIGADORES
FERREIRA Maria Lujan
artículos
Título:
Reaction Mechanism Of Zinc Carboxylate Catalysts In The Transesterification Of Triglycerides
Autor/es:
DEBORATH MARIANA REINOSO; MARÍA LUJÁN FERREIRA; GABRIELA MARTA TONETTO
Revista:
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
Editorial:
ELSEVIER SCIENCE BV
Referencias:
Lugar: Amsterdam; Año: 2013 vol. 377 p. 29 - 41
ISSN:
1381-1169
Resumen:
In this theoretical and experimental study, the mechanisms for the transesterification of triglyceridescatalyzed by zinc carboxylates were analyzed and discussed. Different alternatives were examined: (A)the classic Lewis acid mechanism involving the coordination of the triglyceride through the carbonylgroup with the Zn2+ion, (B) the coordination of methanol with the Zn2+followed by carboxylate shift,and (C) the co-coordination of methanol and the triglyceride with the Zn2+ion. The preferred mechanismincluded the initial coordination of methanol, carboxylate shift and the co-coordination of the triglyceridewith an alkoxide-like moiety.The fatty acid esterification reaction catalyzed by zinc carboxylates was also studied. The anionexchange between the carboxylate in the Zn salt and the fatty acid to be esterified was analyzed.
