نتایج جستجو برای: aromatic amines

تعداد نتایج: 60265  

Journal: :Organic letters 2016
David J Fisher James B Shaum C Landon Mills Javier Read de Alaniz

The synthesis of sterically hindered amines has been a significant challenge in organic chemistry. Herein, we report a modular, three-component coupling that constructs two carbon-nitrogen bonds including a sterically hindered Csp3-N bond using commercially available materials. This process uses an earth-abundant copper catalyst and mild reaction conditions, allowing access to a variety of comp...

Journal: :Molecules 2013
Norio Sakai Nobuaki Takahashi Daiki Inoda Reiko Ikeda Takeo Konakahara

We have demonstrated that a cooperative catalytic system comprised of CuCl and Cu(OTf)(2) could be used to effectively catalyse the three-, five- and seven-component coupling reactions of aliphatic or aromatic amines, formaldehyde, and trimethylsilyl cyanide (TMSCN), and selectively produce in good yields the corresponding cyanomethylamines, N,N-bis(cyanomethyl)amines and N,N'-bis(cyanomethyl)m...

Journal: :Chemical communications 2013
Giyoung Shin Sam Mathew Minsu Shon Byung-Gee Kim Hyungdon Yun

In this study, we developed a one-pot one-step deracemization method for the production of various enantiomerically pure amines using two opposite enantioselective ω-TAs. Using this method, various aromatic amines were successfully converted to their (R)-forms (>99%) with good conversion.

Journal: :Chemical communications 2015
Zhenzhen Yang Hongye Zhang Bo Yu Yanfei Zhao Zhishuang Ma Guipeng Ji Buxing Han Zhimin Liu

Azo-functionalized MOPs (Azo-MOPs) were synthesized via oxidative polymerization of aromatic amines catalyzed by t-BuOCl/NaI (25 °C, 1 h, yield: >95%), which displayed an excellent coordinating ability with a Ru complex. The resulting Ru-coordinated Azo-MOPs displayed high CO2 capacity and high performances for catalyzing the methylation of amines with CO2 under low pressure (0.5 MPa).

Journal: :Journal of AOAC INTERNATIONAL 1996

2005

THERE HAS LONG been an appealing notion that naturally occurring pressor amines may be involved in some way in the pathogenesis of primary hypertension. While conclusions on this thesis have been drawn pro and con in the past, the fact of the matter is that we are only now beginning to emerge from an era of crude technique and inadequate information that largely precluded the attainment of mean...

2005
ALBERT SJOERDSMA

THERE HAS LONG been an appealing notion that naturally occurring pressor amines may be involved in some way in the pathogenesis of primary hypertension. While conclusions on this thesis have been drawn pro and con in the past, the fact of the matter is that we are only now beginning to emerge from an era of crude technique and inadequate information that largely precluded the attainment of mean...

Journal: :Journal of medical genetics 1983
D A Evans L C Eze E J Whibley

There is an association between exposure to aromatic amines and the development of bladder cancer. Aromatic amines such as are known to occur in tobacco smoke are polymorphically acetylated. One hundred bladder cancer patients have been acetylator phenotyped. Only three of them were non-smokers at the time of diagnosis. This new series, together with four previous series (each with its own cont...

Journal: :Molecules 2018
Anne-Frances Miller Jonathan T Park Kyle L Ferguson Warintra Pitsawong Andreas S Bommarius

Nitroreductases (NRs) hold promise for converting nitroaromatics to aromatic amines. Nitroaromatic reduction rate increases with Hammett substituent constant for NRs from two different subgroups, confirming substrate identity as a key determinant of reactivity. Amine yields were low, but compounds yielding amines tend to have a large π system and electron withdrawing substituents. Therefore, we...

Journal: :The Analyst 2007
Toby L Nelson Ivy Tran Tim G Ingallinera Marc S Maynor John J Lavigne

Multiple layers of statistical analyses were used to decipher the response from a single, cross-reactive conjugated polymer (1) providing enhanced classification accuracies over traditional multivariate statistical approaches. This analysis was demonstrated by classifying a series of seven biologically relevant, nonvolatile amines (i.e. biogenic amines). If only a single layer of analysis was e...

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