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^*

来源：Chinese Chemical Letters, 2022, 33(08): 3899-3902.

Two novel uranium-containing selenotungstates Na3[H19(UO2)2(μ2-O)(Se2 W14O52)2]·41 H2 O(U2) and(NH4)10[H4(SeO)2(UO2)2(H2 O)2(H2 Se2 W14O52)(Se2 W14O52)]·66 H2 O(Se2 U2) based on the {Se2 W14O52} unit were successfully prepared and fully characterized.To our knowledge,the uranium is firstly introduced into the selenotungstates.Moreover,it is notable that U2 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%).

• 单位
  河南大学; 东华理工大学