1960-59-4Relevant academic research and scientific papers
Pd-Catalyzed Denitrative Intramolecular C-H Arylation
Asahara, Kitty K.,Okita, Toshimasa,Saito, Ami N.,Muto, Kei,Nakao, Yoshiaki,Yamaguchi, Junichiro
supporting information, p. 4721 - 4724 (2019/06/17)
A Pd-catalyzed intramolecular C-H arylation of nitroarenes has been developed. Nitroarenes bearing tethered aryl groups at the ortho-position can be readily prepared in one step from 2-halonitroarenes by a nucleophilic aromatic substitution (SNAr). Under Pd/BrettPhos catalysis, activations of the C-NO2 bond as well as the C-H bond on arenes generated the corresponding biaryl linkage in moderate to excellent yields.
The effects of ring substituents and leaving groups on the kinetics of SNAr reactions of 1-halogeno- and 1-phenoxy-nitrobenzenes with aliphatic amines in acetonitrile
Crampton, Michael R.,Emokpae, Thomas A.,Isanbor, Chukwuemeka
, p. 1378 - 1383 (2008/09/18)
Rate constants are reported for the reactions of a series of 1-chloro-, 1-fluoro- and 1-phenoxy-nitrobenzenes activated by CF3 or CN groups or by ring-nitrogen with n-butylamine, pyrrolidine or piperidine in acetonitrile. The results are compar
Tris(polyoxaalkyl)amines (Trident), a New Class of Solid-Liquid Phase-Transfer Catalysts
Soula, Gerard
, p. 3717 - 3721 (2007/10/02)
A new class of solid-liquid phase-transfer catalysts has been prepared.These tris(polyoxaalkyl)amines (I) are designed to obtain the best balance between straightforward synthesis (cheap starting materials), high activity, easy recovery, and low toxicity.The catalysts are synthesized from ethylene glycols by a simple one-step method in yields in the range of 65-81percent.They show high catalytic effects in aliphatic nucleophic substitutions and aromatic nucleophilic substitutions on activated and unactivated molecules.In the Ullman synthesis (a new PTC reaction) there is a synergic effect of anionic activation by tridents and by copper salts.Reactions have been carried out at temperatures up to 180 deg C without evidence of decomposition of the tris(polyoxaalkyl)amines. The behavior and catalytic activity of these catalysts are discussed.
THE SALT-FREE SYNTHESIS OF ARYL ETHERS USING METHYL TRICHLOROACETATE
Renga, James M.,Wang, Pen-Chung
, p. 69 - 76 (2007/10/02)
Metyl trichloroacetate is an effective reagent for salt-free synthesis of aryl ethers and anisoles from phenols.
