Photocatalytic C–F alkylation; facile access to multifluorinated arenes
作者:A. Singh、J. J. Kubik、J. D. Weaver
DOI:10.1039/c5sc03013g
日期:——
From the top down; access to complex multifluorinated arenes via multiple photocatalytic C–F substitutions.
从上到下;通过多次光催化C-F取代获得复杂的多氟芳烃。
Synthesis of unsymmetrical biaryl ethers through nickel-promoted coupling of polyfluoroarenes with arylboronic acids and oxygen
作者:Jian Zhang、Jingjing Wu、Yang Xiong、Song Cao
DOI:10.1039/c2cc33755j
日期:——
Polyfluoro-substituted unsymmetrical biaryl ethers were synthesized via a novel Ni-catalyzed cross-coupling reaction of polyfluoroarenes with arylboronic acids and oxygen. The polyfluorinated arenes presumably captured the phenoxide intermediate efficiently, which made the oxygen-insertion proceed smoothly via the SNAr protocol. The 18O labeling experiment demonstrated that the oxygen introduced into unsymmetrical diaryl ether originated from very trace amounts of oxygen in the reaction system. A plausible mechanism was also suggested.
Heptafluoro-p-tolyl and tetrafluoro-4-pyridyl as novel and selective protecting groups for phenolic and alcoholic functions: synthesis and cleavage of perfluoroaryl ethers of steroids
作者:Michael Jarman、Raymond McCague
DOI:10.1039/c39840000125
日期:——
The easily prepared heptafluoro-p tolyl and tetrafluoro-4-pyridylethers of a variety of steroids react with sodium methoxide in dimethylformamide to regenerate the parent steroid by a mechanism involving an aryl–oxygen cleavage.
Fluorinated polyamide acid resin composition for optical materials
申请人:NIPPON SHOKUBAI CO., LTD.
公开号:EP1757957A2
公开(公告)日:2007-02-28
A fluorinated polyamide acid resin composition for optical materials containing a fluorinated polyamide acid and a non-polycondensable compound (A) with an aromatic ring having a boiling point of 340°C or lower, the resin composition being used for obtaining a fluorinated polyimide membrane by a baking process. This fluorinated polyamide acid resin composition for optical materials contains a non-polycondensable compound (A) which was found to reduce a light absorption at 1.49 µm and a light absorption at 1.35 µm and extending to visible light, even if the baking temperature is 340°C or lower.