Catalysis Today p. 47 - 52 (2019)
Update date:2022-08-28
Topics:
Smuszkiewicz, Agata
López-Sanz, Jesús
Sobczak, Izabela
Martín-Aranda, Rosa M.
Ziolek, Maria
Pérez-Mayoral, Elena
TaMCF silicas modified with alkaline metals can be considered a novel family of highly efficient bifunctional catalysts involved in the synthesis of chromene derivatives, from salicylaldehyde 2 and acetonitrile compounds, under mild conditions, showing enhanced catalytic performance than their NbMCF analogues. The observed reactivity was mainly attributed to the higher basicity of the Me/TaMCF but also the texture of the samples. The Me/TaMCF silicas showed higher Br?nsted basicity than the Nb ones as indicated by the stronger interaction between alkali metals and Ta in the UV–vis and the test reaction experiments. On the other hand, the basicity of Me/TaMCF together the reactivity degree and steric hindrance of the starting acetonitriles are key factors influencing the reaction selectivity. In conclusion, the basicity of the samples plays an important role initiating the reaction by activation of nucleophile but also a compromise between alkaline cation size and basicity is required.
View MoreContact:+86-571-28186845
Address:Room 1224,Eastcom Mansion,398 Wensan Road,Hangzhou,310013 China
website:http://www.shengmaochem.com
Contact:86-27-82853423, 82819281
Address:Rm 202, A Unit Huaqiao Building No. 2, Lihuangpi Road, Wuhan, China
PharmaResources(Kaiyuan)CO,.Ltd
Contact:+86-21-50720028
Address:No.3, Beihuan Road, Economic Development District, Kaiyuan City, Tieling City, Liaoning Province, China 112300
Evergreen Chemical Industry Ltd.
Contact:86-553-4918210
Address:6#2-602 Wanhaobailing
Contact:86-10-62983737; +86-10-51287608
Address:4/F Building C, 2 Shangdi Xinxi Road
Doi:10.1021/jo01276a054
(1968)Doi:10.1002/anie.201709186
(2017)Doi:10.1021/acs.inorgchem.9b03743
(2020)Doi:10.1016/S0957-4166(99)00185-8
(1999)Doi:10.1039/c8nj06235h
(2019)Doi:10.1016/S0022-328X(03)00728-9
(2003)