74683-29-7Relevant articles and documents
Ligand-free Cu(ii)-catalyzed aerobic etherification of aryl halides with silanes: An experimental and theoretical approach
Ahmed, Muhammad Naeem,Ahmad, Khalil,Yasin, Khawaja Ansar,Farooq, Tayyaba,Khan, Bilal Ahmad,Roy, Soumendra K.
, p. 11316 - 11333 (2019/07/31)
Owing to their wide occurrence in nature and immense applications in various fields, the synthesis of aryl alkyl ethers has remained a focus of interest. In contrast to the conventional/traditional methods of etherification, herein, we have reported a more efficient method, which is better yielding and more general in application. The etherification of aryl halides by alkoxy/phenoxy silanes was catalyzed by copper acetate in the presence of cesium carbonate and oxygen in DMF at 145 °C. All the as-synthesized compounds were characterized via the 1H-NMR and 13C-NMR spectroscopic techniques. Density functional theory calculations using the B3LYP functional were performed to elucidate the reaction mechanism. The C-O coupling reaction between 2-nitroiodobenzene and tetramethoxysilane was used as a model reaction. The activation energy barriers for the generation of catalytic species (31.6 kcal mol-1) and the σ-bond metathesis (16.0 kcal mol-1), oxidative addition/reductive elimination (20.3 kcal mol-1), halogen atom transfer (19.2 kcal mol-1) and single electron transfer (SET) (29.5 kcal mol-1) mechanisms for the C-O coupling reaction were calculated. Calculations for the key reaction steps were repeated with the B3PW91, PBEH1PBE, wB97XD, CAM-B3LYP and mPW1LYP functionals. The formation of catalytic species via a single electron transfer reaction between tetramethoxysilane and copper acetate, formation of methoxy radicals and methoxylation of copper showed an overall energy barrier of 31.6 kcal mol-1, and therefore is the rate determining step.
Synthesis of near-infrared fluorescent rhodamines via an SNArH reaction and their biological applications
Wang, Qing,Huang, Kun,Cai, Songtao,Liu, Chang,Jiao, Xiaojie,He, Song,Zhao, Liancheng,Zeng, Xianshun
supporting information, p. 7163 - 7169 (2018/10/24)
Near-infrared (NIR) dyes are of great interest in biomedicine due to diminished interfering absorption and fluorescence from biological samples, reduced scattering, and enhanced tissue penetration depth. In this context, we report the synthesis of rectili
4-Hydroxy-2'-nitrodiphenyl ether analogues as novel tyrosinase inhibitors
Sapkota, Kiran,Lee, Eunyoung,Yang, Jae-Ho,Kwon, Youngjoo,Choi, Jongwon,Na, Younghwa
experimental part, p. 1319 - 1325 (2010/09/18)
Tyrosinase ubiquitously existing from microorganisms to animals and plants is known to be the most critical and rate limiting enzyme during melanin biosynthesis. In order to develop new tyrosinase inhibitor we have synthesized 14 diphenyl ether compounds
