The substitution products 3 (L=CO) and 4 (L= PMe3) react with an equimolar amount of sulfur or selenium by addition of the chalcogen to the Rh=CPh2 bond to generate the complexes [(eta5-C5H5)Rh(kappa2-ECPh2)(L)] (21-24) with thio- or selenobenzophenone as ligand. Similarly, treatment of 3 with CuCl affords the unusual 1:2 adduct [(eta5-C5H5)(CO)Rh(mu-CPh2)(CuCl)2] (25), which reacts with NaC5H5 to form
Palladium(II)-Catalyzed Cross-Coupling of Diazo Compounds and Isocyanides to Access Ketenimines
作者:Zhaohong Liu、Shanshan Cao、Jiayi Wu、Giuseppe Zanoni、Paramasivam Sivaguru、Xihe Bi
DOI:10.1021/acscatal.0c02867
日期:2020.11.6
functionalities and valuable building blocks commonly utilized in organic synthesis. Their cross-coupling for the synthesis of useful isolable ketenimines remains an unsolved challenge in synthetic chemistry. Herein, we report a general method for the preparation of ketenimines via a palladium-catalyzed cross-coupling of easily accessible diazo compounds with isocyanides. The reaction benefits from the
The SRN1 free radical chain reaction of Me3CHgCl with nitronate (−O2NC(R1)(R2)) and phenoneenolate (PHC(0−)C(R1)(R2)) anions yields the C-alkylation products (Me3CC(R1)(R2)N02, PhCOC(R1)(R2)CMe3). Competitive reactions between pairs of anions demonstrate that as the basicity of the anion increases the reactivity toward Me3C at first increases and then decreases. An inverted reactivity order is also
provides an efficient method for the synthesis of organometallic complexes with the 1-azaallyl ligands. It is found that an excess of ketenimine does not affect the nature of the final complexes, with only a monoinsertion product being observed. All these complexes are characterized by elemental analysis and spectroscopic properties. The structures of these complexes have also been determined through
的治疗的[Cp 2 LN(μ-Me)中] 2 1和Cp 2 LnPh与PhRC═C═N吨卜给出了插入产品的Cp 2 LN [吨BuNC(R')CRPh](R =苯基,R'=我,Ln = Y(1-Y),Er(1-Er),Yb(1-Yb); R = Ph,R'= Ph,Ln = Y(2-Y),Er(2-Er),Yb (2-Yb); R = H,R'= Me,Ln = Y(3-Y),Er(3-Er),Yb(3-Yb); R = H,R'= Ph,Ln = Y (4-Y),Er(4-Er),Yb(4-Yb)),这是酮亚胺插入镧系元素碳键的第一个例子,它提供了一种合成具有1-氮杂烯丙基配体的有机金属配合物的有效方法。发现过量的酮亚胺不影响最终复合物的性质,仅观察到单插入产物。所有这些配合物的特征在于元素分析和光谱性质。这些配合物的结构也已通过X射线单晶衍射分析确定,揭示了芳基取代的氮杂烯丙基与金属的新型键合方式。
New synthesis of diphenyl-N-(substituted)ketenimines from diaminophosphonium diazaylides
Diaminophosphonium diazaylides 2 react under mild conditions with diphenylacetyl chloride, to afford diphenyl-N-(substituted)ketenimines 4 or, depending on the case, their transformation products: either the tautomer 8, or the dimer 9. The general reaction seems to proceed firstly via an elimination step on the acid chloride followed then by an aza-Wittig reaction between the resulting ketene 7 and