.- A study of the temperature effect on Hantzsch reaction selectivity using Mn and Ce oxides under solvent-free conditions

ORIANA D?ALESSANDRO, ; ÁNGEL G. SATHICQ,; JORGE E. SAMBETH, ; HORACIO J. THOMAS,

CATALYSIS COMMUNICATIONS

ELSEVIER SCIENCE BV

Lugar: Amsterdam; Año: 2015 vol. 60 p. 65 - 69

1566-7367

In this communication, four materials (CeO2, CeO2(Cu), MnOx, and MnOx(Cu))were prepared, characterized andtested as catalysts, in solvent-free conditions, for the multicomponent Hantzsch reactions to obtain alternativelythe 1,4-dihydropyridine or 2-phenylpyridine depending on the reaction conditions. 1,4-Dihydropyridine 4 wasthe main product formed at 80 °C (76%), and 2-phenylpyridine 7 was the main product at 40 °C (91%), inoxidant-free conditions, using CeO2 catalyst. It is the first report that shows that, not only the temperature butalso the nature of the catalyst may change the product selectivity in Hantzsch reactions.