نتایج جستجو برای: substitution reaction

تعداد نتایج: 464157  

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...

A facile and efficient one-pot three-step process for the synthesis of 5-acetyl-2-imino-4-methylthiazoles via the cyclocondensation of 3-thiocyanatoacetylacetone with various hydrazine or hydrazide derivatives in EtOH has been developed. 3-Thiocyanatoacetylacetone itself has been synthesized as the intermediate from substitution reaction of thiocyanate with 3-chloroacetylacetone. B...

Journal: :Chemical communications 2008
Ryosuke Asami Toshio Fuchigami Mahito Atobe

The anodic substitution reaction proceeded smoothly without affecting the oxidation of the nucleophile in a one-step electrochemical operation using acoustic emulsification.

Journal: :Organic & biomolecular chemistry 2011
Tianmin Niu Lehao Huang Tianxing Wu Yuhong Zhang

An efficient iron-promoted alkylation of indoles with enamides has been accomplished under mild reaction conditions. The reaction proceeded with remarkable regioselectivity leading exclusively to substitution by indoles at α-position of enamides.

Journal: :Physical Chemistry Chemical Physics 2021

High-level composite ab initio computations reveal several abstraction and substitution pathways for the multi-channel Cl + CH3NH2 reaction.

2016
Masahiro Terada

Among the methods for asymmetric synthesis, enantioselective catalysis is one of the representatives to produce enantio-enriched molecules in an efficient and practical manner. Catalytic enantioselective nucleophilic addition to pro-chiral electrophiles such as aldehydes, ketones, imines, and electron deficient double bonds is one of the most extensively investigated reactions, and substantial ...

Journal: :Chemistry, an Asian journal 2008
Heiko Lange Klaus Bergander Roland Fröhlich Seda Kehr Shuichi Nakamura Norio Shibata Takeshi Toru Dieter Hoppe

Substitution reactions that employ primary-carbamoyl-protected arylmethanethiols are described. The enantiodetermining step was found to occur in the post-deprotonation step as a dynamic thermodynamic resolution with a chiral bis(oxazoline) ligand. The configurationally labile lithium complexes were trapped with various electrophiles to yield different substitution products in good to excellent...

Journal: :Dalton transactions 2015
Shaban Y Shaban Abd El-Motaleb M Ramadan Mohamed M Ibrahim Mahmoud A Mohamed Rudi van Eldik

A series of copper(ii) complexes, viz. [Tp(MeMe)Cu(Cl)(H2O)] (), [Tp(MeMe)Cu(OAc)(H2O)] (), [Tp(MeMe)Cu(NO3)] () and [Tp(MeMe)Cu(ClO4)] () containing tris(3,5-dimethylpyrazolyl)borate (KTp(MeMe)), have been synthesized and fully characterized. The substitution reaction of with thiourea was studied under pseudo-first-order conditions as a function of concentration, temperature and pressure in me...

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