A Dimeric NHC–Silicon Monotelluride: Synthesis, Isomerization, and Reactivity. Issue 38 (7th August 2017)

• Record Type: Journal Article
• Authors: Chan, Yuk‐Chi; Leong, Bi‐Xiang; Li, Yongxin; Yang, Ming‐Chung; Li, Yan; Su, Ming‐Der; So, Cheuk‐Wai
• Is Part Of: Angewandte Chemie international edition. Volume 56:Issue 38(2017)
• Page Start: 11565
• Page End: 11569
• Publication Date: 2017-08-07
• Subjects: carbenes -- low-valent homologues -- silicon -- sulfur -- tellurium; Chemistry -- Periodicals; 540
• DOI: 10.1002/anie.201705168
• Languages: English
• ISSNs: 1433-7851

Abstract

Abstract: The reaction of the NHC–disilicon(0) complex [(IAr )Si=Si(IAr )] (1, IAr =:C{N(Ar)C(H)}2, Ar=2, 6‐ i Pr2 C6 H3 ) with two equiv of elemental Te in toluene at room temperature for three days afforded a mixture of the first dimeric NHC–silicon monotelluride [(IAr )Si=Te]2 (2 ) and its isomeric complex [(IAr )Si(μ‐Te)Si(IAr )=Te] (3 ). When the same reaction was performed for ten days, only3 was isolated from the reaction mixture. Compound1 reacted with four equiv of elemental Te in toluene for four weeks, which proceeded through the formation of2, 3 and the NHC–disilicon tritelluride complex [{(IAr )Si(=Te)}2 Te] (5‐Te ), to form the dimeric NHC–silicon ditelluride [(IAr )Si(=Te)(μ‐Te)]2 (4 ). The reactions are in line with theoretical mechanistic studies for the formation of4 . Compound3 reacted with one equiv of elemental sulfur in toluene to form the first NHC–disilicon sulfur ditelluride complex [{(IAr )Si(=Te)}2 S] (5‐S ). Abstract : The NHC–disilicon(0) complex1 underwent an oxidation with elemental tellurium to form the dimeric NHC–silicon monotelluride2 . It isomerized to form the more stable species3 . It was further oxidized with elemental sulfur to form the first NHC–disilicon sulfide ditelluride5‐S .