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

Journal of the Brazilian Chemical Society

Almeida, Mainara T. de¹  Barbosa, Sandro L.²  Ottone, Myrlene³ 

[1] Universidade Estadual de São Paulo, Araraquara, Brazil;Universidade Federal dos Vales do Jequitinhonha e Mucuri, Diamantina, Brazil;Universidade de São Paulo, Ribeirão Preto, Brazil

关键词: protonated ketones;    self-aldolization;    ketalization;    ketal hydrolysis;    sulfonated silica.;   

DOI  :  10.21577/0103-5053.20180039

学科分类：化学（综合）

来源: SciELO

【 摘 要 】

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.

【 授权许可】

CC BY