نتایج جستجو برای: solution phase synthesis

تعداد نتایج: 1406841  

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه رازی - دانشکده علوم 1390

in this thesis, a better reaction conditions for the synthesis of spirobarbiturates catalyzed by task-specific ionic liquid (2-hydroxy-n-(2-hydroxyethyl)-n,n-dimethylethanaminium formate), calcium hypochlorite ca(ocl)2 or n-bromosuccinimide (nbs) in the presence of water at room temperature by ultrasonic technique is provided. the design and synthesis of spirocycles is a challenging task becaus...

Journal: :Dalton transactions 2014
Lin Han Pengfei Hou Yan Feng Hui Liu Jianling Li Zhijian Peng Jun Yang

Phase transfer techniques possess remarkable advantages for the synthesis of inorganic nanomaterials. In contrast to the abundant reports on the preparation of noble metal nanoparticles using phase transfer, the number of semiconductor nanocrystals syntheses based on phase transfer techniques is still limited. Herein, we report a systematic study of the phase transfer-based synthesis of HgS nan...

Journal: :Molecules 2011
Danilo Mirizzi Maurizio Pulici

Since Gomberg's discovery of radicals as chemical entities, the interest around them has increased through the years. Nowadays, radical chemistry is used in the synthesis of 75% of all polymers, inevitably establishing a close relationship with Solid-Phase Organic Synthesis. More recently, the interest of organic chemists has shifted towards the application of usual "in-solution" radical chemis...

Journal: :Small 2007
Aneta J Mieszawska Romaneh Jalilian Gamini U Sumanasekera Francis P Zamborini

There are a variety of methods for synthesizing or fabricating one-dimensional (1D) nanostructures containing heterojunctions between different materials. Here we review recent developments in the synthesis and fabrication of heterojunctions formed between different materials within the same 1D nanostructure or between different 1D nanostructures composed of different materials. Structures cont...

Journal: :Molecules 2016
Alessandro Pellis Georg M Guebitz Thomas J Farmer

Microwave energy (MWe) is, nowadays, widely used as a clean synthesis tool to improve several chemical reactions, such as drug molecule synthesis, carbohydrate conversion and biomass pyrolysis. On the other hand, its exploitation in enzymatic reactions has only been fleetingly investigated and, hence, further study of MWe is required to reach a precise understanding of its potential in this fie...

Journal: :Molecules 2005
Irina O Zhuravel Sergiy M Kovalenko Sergiy V Vlasov Valentin P Chernykh

The parallel solution-phase synthesis of a new combinatorial library of 3-[4-(R1-coumarin-3-yl)-1,3-thiazol-2-ylcarbamoyl]propanoic acid amides 9 has been developed. The synthesis involves two steps: 1) the synthesis of core building blocks - 3- [4-(coumarin-3-yl)-1,3-thiazol-2-ylcarbamoyl]propanoic acids, 6 - by the reaction of 3-(omega-bromacetyl)coumarins 1 with 3-amino(thioxo)methylcarbamoy...

Journal: :Angewandte Chemie 2021

By manipulating the nucleation and growth of solid materials, synthesis various sophisticated nanostructures has been achieved. Similar methodology, if applied to liquids, could enable mass-production control ultra-small droplets at scale nanoparticles (10?18 L or below). It would be highly desirable since play a fundamental role in numerous applications. Here we present general strategy synthe...

Journal: :Journal of combinatorial chemistry 2005
Igor L Dalinger Irina A Vatsadse Svyatoslav A Shevelev Alexandre V Ivachtchenko

The parallel solution-phase synthesis of more than 2200 7-trifluoromethyl-substituted pyrazolo[1,5-a]pyrimidine and 4,5,6,7-tetrahydropyrazolo[1,5-a]pyrimidine carboxamides on a 50-100-mg scale has been accomplished. Key reactions include assembly of the pyrazolo[1,5-a]pyrimidine ring by condensation of 5-aminopyrazole derivatives with the corresponding trifluoromethyl-beta-diketones. The libra...

Journal: :Chemical communications 2014
Jianbin Wu Guanghui An Siqi Lin Jianbo Xie Wei Zhou Hao Sun Yi Pan Guigen Li

The solution phase synthesis of N-protected amino acids and peptides has been achieved through the Group-Assisted Purification (GAP) chemistry by avoiding disadvantages of other methods in regard to the difficult scale-up, expenses of solid and soluble polymers, etc. The GAP synthesis can reduce the use of solvents, silica gels, energy and manpower. In addition, the GAP auxiliary can be conveni...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 1997
G W Shipps K E Pryor J Xian D A Skyler E H Davidson J Rebek

Five synthetic combinatorial libraries of 2,080 components each were screened as mixtures for inhibition of DNA binding to two transcription factors. Rapid, solution-phase synthesis coupled to a gel-shift assay led to the identification of two compounds active at a 5- to 10-microM concentration level. The likely mode of inhibition is intercalation between DNA base pairs. The efficient deconvolu...

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