نتایج جستجو برای: one pot procedure

تعداد نتایج: 2471761  

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه سیستان و بلوچستان 1390

روش های موثر برای سنتز ترکیبات مختلف با استفاده از واکنش چند جزئی و تک ظرفی (one-pot) در حضور کاتالیست هتروژن و قابل بازیافت p2o5 / sio2 تحت شرایط بدون حلال و در مدت زمان کوتاه و با بازده ی بالا ارائه شده است. تعدادی از این سنتزها در زیر آورده شده است: - سنتز مشتقات کوئینوکسالین: -سنتز مشتقات بنزیمیدازول: -سنتز مشتقات اریل تری متیل سایلیل اتر ها: -سنتز مشتقات پنتاا...

Journal: :The Journal of organic chemistry 2014
Pengfei Li Guolin Cheng Hong Zhang Xianxiang Xu Jingyuan Gao Xiuling Cui

An efficient "one-pot" approach to multiple substituted ureas from N-arylcyanamide and diaryliodonium salts has been presented. The two-step procedure involved the weak base-promoted chemoselective arylation of secondary amines with diaryliodonium and Cu-catalyzed nucleophilic addition of N-arylcyanamide with second diaryliodonium. The diverse unsymmetrical arylureas were obtained in up to 91% ...

Journal: :Organic letters 2012
Liangguang Wang Xiaoqiang Yu Xiujuan Feng Ming Bao

An efficient method for the synthesis of 3,5-disubstituted pyrazoles is described. The reactions of 1,3-dialkynes with hydrazine proceeded smoothly in dimethyl sulfoxide under mild reaction conditions to produce 3,5-disubstituted pyrazoles in satisfactory to excellent yields. A one-pot procedure of the transformation has been developed.

Journal: :Chemical communications 2013
Macharla Arun Kumar Peraka Swamy Mameda Naresh Marri Mahender Reddy Chozhiyath Nappunni Rohitha Sripadi Prabhakar Akella Venkata Subrahmanya Sarma Joseph Richard Prem Kumar Nama Narender

A new metal-free protocol is described for the synthesis of terminal acetals by tandem oxidative rearrangement of olefins using oxone as an oxidant in the presence of iodine. Moreover, a one-pot procedure for the preparation of glycol mono esters from olefins is also presented for the first time using the same reagent system.

Journal: :Chemical communications 2013
Wei Zeng Wanqing Wu Huanfeng Jiang Liangbin Huang Yadong Sun Zhengwang Chen Xianwei Li

Regioselective synthesis of polysubstituted benzofurans using a copper catalyst and molecular oxygen from phenols and alkynes in a one-pot procedure has been reported. The transformation consists of a sequential nucleophilic addition of phenols to alkynes and oxidative cyclization. A wide variety of phenols and alkynes can be used in the same manner.

Journal: :Chemical communications 2011
Chien-Cheng Li Yan-Wun Chen Ran-Jin Lin Ching-Chun Chang Kuei-Hsien Chen Hong-Ping Lin Li-Chyong Chen

A simple and convenient one-pot synthetic route to directly prepare a self-reductive mesoporous copper-iron-silicate (CuO(x)-Fe-silicate)-based catalyst has been developed. The resultant catalyst is highly active and stable in methanol reforming without needing a pre-reduction procedure.

Journal: :Chemical communications 2011
Sergio H Domingues Rodrigo V Salvatierra Marcela M Oliveira Aldo J G Zarbin

This communication reports a simple, one-pot procedure for the synthesis and processing of transparent and conductive thin films of graphene/polyaniline nanocomposites based on an interfacial polymerization. Thin films presenting transmittance of 89% and sheet resistance of 60.6 Ω sq(-1) are spontaneously obtained and can be easily transferred to suitable substrates.

Journal: :Chemical communications 2013
Basit Yameen Cesar Rodriguez-Emmenegger Ishtiaq Ahmed Corinna M Preuss Christoph J Dürr Nicolas Zydziak Vanessa Trouillet Ljiljana Fruk Christopher Barner-Kowollik

An unprecedented one-pot procedure employing a cyclopentadienyl functionalized RAFT agent allowed the grafting of poly(carboxybetaine acrylamide) - a highly functional and biocompatible polymer - from the surface of pristine SWCNTs. The pendant carboxylic acid groups of the surface grafted polymer were further conjugated with single-stranded (ss)-DNA, which was successfully hybridized with a Cy...

Journal: :Chemical communications 2014
Stefanie Klotzbach Thorsten Scherpf Florian Beuerle

Molecular cubes constructed from catechol-functionalized tribenzotriquinacenes and 1,4-phenylene diboronic acids were synthesized in a one-pot procedure by crosslinking 20 individual components through a dynamic covalent approach. Structural identity of the nanocubes was confirmed by mass spectrometry and (1)H-NMR spectroscopy.

2008
Hisashi YAMAMOTO

This review focuses on the development of acid catalysis for selective organic transformations conducted in our laboratories for the past 30 years. Several important concepts in designing of catalysts are described with some examples. Further, recent developments in super Brønsted acid and their applications in a one-pot procedure to construct complex molecules with high diastereoselectivities ...

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