Ketalization of Ketones to 1,3-Dioxolanes and Concurring Self-Aldolization Catalyzed by an Amorphous, Hydrophilic SiO2-SO3H Catalyst under Microwave Irradiation
AUTOR(ES)
Barbosa, Sandro L., Ottone, Myrlene, Almeida, Mainara T. de, Lage, Guilherme L. C., Almeida, Melina A. R., Nelson, David Lee, Santos, Wallans T. P. dos, Clososki, Giuliano C., Lopes, Norberto P., Klein, Stanlei I., Zanatta, Lucas D.
FONTE
J. Braz. Chem. Soc.
DATA DE PUBLICAÇÃO
2018-08
RESUMO
The amorphous, mesoporous SiO2-SO3H catalyst with a surface area of 115 m2 g-1 and 1.32 mmol H+ per g was very efficient for the protonation of ketones on a 10% (m/m) basis, and the catalyst-bound intermediates can be trapped by polyalcohols to produce ketals in high yields or suffer aldol condensations within minutes under low-power microwave irradiation. The same catalyst can easily reverse the ketalization reaction.
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