Nucleophile-Catalyzed, Facile, and Highly Selective C–H Activation of Fluoroform with Pd(II)
摘要:
Exceedingly facile (23 degrees C) and chemoselective H-CF3 activation with [(dppp)Pd(Ph)(OH)] in the presence of a Lewis base promoter such as n-Bu3P leads to Pd-CF3 bond formation in nearly quantitative yield. A combined experimental and computational study points to a new mechanism that involves H-bonding Pd-O(H)center dot center dot center dot H-CF3 and nucleophilic attack of the promoter on the metal, followed by a push-pull-type collapse of the resultant five-coordinate Pd(II) intermediate via a polar transition state.
New Vistas in Transmetalation with Discrete “AgCF
<sub>3</sub>
” Species: Implications in Pd‐Mediated Trifluoromethylation Reactions
作者:Sara Martínez de Salinas、Ángel L. Mudarra、Jordi Benet‐Buchholz、Teodor Parella、Feliu Maseras、Mónica H. Pérez‐Temprano
DOI:10.1002/chem.201802586
日期:2018.8.14
This work describes the employment of discrete “AgCF3” complexes as efficient transmetalating agents to PdII to surmount overlooked challenges related to the transmetalation step in Pd‐catalyzed trifluoromethylation processes. We report the participation of a unique silver ate (Cs)[Ag(CF3)2] complex, under stoichiometric and catalytic conditions, in the unprecedented one‐pot formation of PhCF3 using