Alkaline‐earth (Ae=Ca, Sr, Ba) complexes are shown to catalyse the chemoselective cross‐dehydrocoupling (CDC) of amines and hydrosilanes. Key trends were delineated in the benchmark couplings of Ph3SiH with pyrrolidine or tBuNH2. AeE(SiMe3)2}2⋅(THF)x (E=N, CH; x=2–3) are more efficient than N^N}AeE(SiMe3)2}⋅(THF)n (E=N, CH; n=1–2) complexes (where N^N}−=ArN(o‐C6H4)C(H)=NAr}− with Ar=2,6‐iPr2‐C6H3)
碱土(Ae = Ca,Sr,Ba)配合物可催化胺和氢硅烷的化学选择性交叉脱氢偶联(CDC)。在Ph 3 SiH与吡咯烷或t BuNH 2的基准偶联中描述了关键趋势。阂E(森达3)2 } 2 ⋅(THF)X(E = N,CH; X = 2〜3)比更有效N ^ N} 阂E(森达3)2 } ⋅(THF)n(E = N,CH; n = 1–2)个络合物(其中N ^ N} - = ArN(o -C 6 H 4)C(H)= NAr}− Ar = 2,6 - i Pr 2– C 6 H 3)带有亚氨基苯胺配体,烷基预催化剂比酰胺类似物更好。周转频率(TOF)以Ca 30种产品)包括二胺和二(氢硅烷)。对吡咯烷和Ph 3 SiH的Ba促进的CDC的动力学分析表明:1)动力学规律为速率= k [Ba] 1 [胺] 0 [氢硅烷] 1,2)芳基氢硅烷上的吸电子p取代基可提高反应速率,并且3)对于Ph
Selective Electrochemical Hydrolysis of Hydrosilanes to Silanols via Anodically Generated Silyl Cations
The first electrochemical hydrolysis of hydrosilanes to silanols under mild and neutral reaction conditions is reported. The practical protocol employs commercially available and cheap NHPI as a hydrogen‐atom transfer (HAT) mediator and operates at room temperature with high selectivity, leading to various valuable silanols in moderate to good yields. Notably, this electrochemical method exhibits a
Alkaline‐earth (most prominently barium) complexes of the type [AeN(SiMe3)2}2⋅(THF)x] and [N^N}AeN(SiMe3)2}⋅(THF)x] are very active and productive precatalysts (TON=396, TOF up to 3600 h−1; Ca
碱土(最显着的钡)的类型的配合物[阂N(森达3)2 } 2 ⋅(THF)X ]和[N ^ N}阂N(森达3)2 }⋅(THF)X ]是非常活跃和高效的预催化剂(TON = 396,TOF高达3600 h -1; Ca
Cross-Electrophile Silylation of Aryl Carboxylic Esters with Hydrochlorosilanes by SiH-Directed and Cr-Catalyzed Couplings
作者:Chao Li、Shangru Yang、Xiaoming Zeng
DOI:10.1021/acscatal.3c02852
日期:2023.9.15
coupling of two strong electrophilic bonds has been less developed. We report here silylationreactions that proceed by coupling of strong Si–Cl/C–O bonds in a process that is promoted by chromium catalysis via α-agostic SiH → Cr interactions, allowing the formation of Si–C bonds under ambient conditions. The reactions occur by coupling of inexpensive hydrochlorosilanes with unactivated aryl carboxylic
[EN] SILYL-BENZIMIDAZOLO[1,2-A]BENZIMIDAZOLE AS HOST FOR ORGANIC LIGHT EMITTING DIODES<br/>[FR] SILYL-BENZIMIDAZOL[1,2-A]BENZIMIDAZOLE EN TANT QU'HÔTE POUR DIODES ÉLECTROLUMINESCENTES ORGANIQUES