Two Dawson-type U(Ⅵ)-containing selenotungstates with sandwich structure and its high-efficiency catalysis for pyrazoles  

作　　者：Mengyuan Cheng Yufeng Liu Weixin Du Jingwen Shi Junhua Li Haiying Wang Ke Li Guoping Yang Dongdi Zhang 

机构地区：[1]Henan Key Laboratory of Polyoxometalate Chemistry,College of Chemistry and Chemical Engineering,Henan University,Kaifeng 475004,China [2]Jiangxi Province Key Laboratory of Synthetic Chemistry,Jiangxi Key Laboratory for Mass Spectrometry and Instrumentation,East China University of Technology,Nanchang 330013,China

出　　处：《Chinese Chemical Letters》2022年第8期3899-3902,共4页中国化学快报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.22071045,22001034);Excellent Youth Science Fund Project of Henan Province(No.202300410042);the Open Fund of the Jiangxi Province Key Laboratory of Synthetic Chemistry(No.JXSC202008);the start-up fund of Henan University。

摘　　要：Two novel uranium-containing selenotungstates Na_(3)[H_(19)(UO_(2))_(2)(μ_(2)-O)(Se_(2)W_(14)O_(52))_(2)]·41 H_(2)O(U_(2))and(NH_(4))_(10)[H_(4)(SeO)_(2)(UO_(2))_(2)(H_(2)O)_(2)(H_(2)Se_(2)W_(14)O_(52))(Se_(2)W_(14)O_(52))]·66 H_(2)O(Se_(2)U_(2))based on the{Se_(2)W_(14)O_(52)}unit were successfully prepared and fully characterized.To our knowledge,the uranium is firstly introduced into the selenotungstates.Moreover,it is notable that U_(2)exhibits excellent Lewis acid-base catalytic activities in the condensation cyclization of sulfonyl hydrazides with diketones to synthesize polysubstituted pyrazoles.All the desired products were obtained in moderate to good yields(up to 99%).

关 键 词：Selenotungstates URANIUM Dawson-type Condensation reaction PYRAZOLES 

分 类 号：TQ460.1[化学工程—制药化工] TQ426