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Ketalization of Ketones to 1,3-Dioxolanes and Concurring Self-Aldolization Catalyzed by an Amorphous, Hydrophilic SiO2-SO3H Catalyst under Microwave Irradiation

2018; Brazilian Chemical Society; Linguagem: Inglês

10.21577/0103-5053.20180039

1678-4790

Sandro Barbosa, Myrlene Ottone, Mainara de Almeida, Guilherme L. C. Lage, Melina Alves Rodrigues Almeida, David Lee Nelson, Wallans Torres Pio dos Santos, Giuliano C. Clososki, Norberto Peporine Lopes, Stanlei I. Klein, Lucas D. Zanatta,

Asymmetric Synthesis and Catalysis

The amorphous, mesoporous SiO 2 -SO 3 H catalyst with a surface area of 115 m 2 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.