Dehydrogenative Coupling of Terminal Alkynes with O/N-Based Monohydrosilanes Catalyzed by Rare-Earth Metal Complexes
作者:Xiancui Zhu、Dianjun Guo、Zeming Huang、Tian Sheng、Shaowu Wang、Mengke Pan、Ling Zha、Shuangliu Zhou
DOI:10.1021/acs.inorgchem.0c01902
日期:2020.10.5
yields via the reactions of RE(CH2SiMe3)3(thf)2 with the proligand H2L in a single step. Mechanistic studies reveal that treatment of 1 with phenylacetylene could generate the active catalytic species: dinuclear rare-earth metal alkynides (L(thf)n[RE(μ-C≡CPh)]2L) (RE = Y(5a), n = 1; Yb(5c), n = 0), which could react with HSi(OEt)3 to produce the coupling product 4aa and the dinuclear rare-earth metal
新合成的带有三吡咯基配体的稀土金属烷基络合物可作为优异的预催化剂,用于各种末端炔烃与HSi(OEt)3 / HSi(NMe 2)3的O / N基单氢硅烷之间的交叉脱氢偶联,从而导致以高收率形成各种烷氧基甲硅烷基炔烃和氨基甲硅烷基炔烃衍生物。预催化剂L RE(CH 2 SiMe 3)(thf)2(RE = Y(1a),Er(1b),Yb(1c),L = 2,5-[(2-C 4 H 3 N)CPh 2 ] 2(C通过RE(CH 2 SiMe 3)3(thf)2与配位体H 2 L的一步反应,可以容易地以高收率制备4 H 2 NMe(thf =四氢呋喃)。机理研究表明,用苯乙炔处理1可以生成活性催化物种:双核稀土金属炔烃(L(thf)n [RE(μ-C≡CPh)] 2 L)(RE = Y(5a),n = 1; Yb(5c),n = 0),可以与HSi(OEt)3反应生成偶联产物4aa和双核稀土金属氢化物(L(thf)[RE(μ-H)]