Synthesis of poly(L-lactide)-grafted pullulan through coupling reaction between amino group end-capped poly(L-lactide) and carboxymethyl pullulan and its aggregation behavior in water

2004 ◽  
Vol 42 (21) ◽  
pp. 5482-5487 ◽  
Author(s):  
Tatsuro Ouchi ◽  
Tetsuji Minari ◽  
Yuichi Ohya
Keyword(s):  
Coupling Reaction ◽  
Aggregation Behavior ◽  
Amino Group ◽  
Carboxymethyl Pullulan

ChemInform Abstract: Simultaneous Reduction of Nitro- to Amino-Group in the Palladium-Catalyzed Suzuki Cross-Coupling Reaction.

ChemInform ◽  
2008 ◽  
Vol 39 (31) ◽  
Author(s):  
Heng-Shan Wang ◽  
Ying-Chun Wang ◽  
Ying-Ming Pan ◽  
Shu-Lin Zhao ◽  
Zhen-Feng Chen
Keyword(s):  
Coupling Reaction ◽  
Cross Coupling ◽  
Amino Group ◽  
Simultaneous Reduction ◽  
Cross Coupling Reaction ◽  
Palladium Catalyzed

scholarly journals Synthesis and Characterization of Some New Azo Dyes Derivatives Via Chalcone and Study Some of Their Biological Activity

2016 ◽  
Vol 13 (1) ◽  
pp. 122-132
Author(s):  
Baghdad Science Journal
Keyword(s):  
Biological Activity ◽  
Azo Dyes ◽  
Coupling Reaction ◽  
Basic Medium ◽  
Synthesis And Characterization ◽  
Diazonium Salts ◽  
Amino Group ◽  
Ft Ir ◽  
New Compounds

This work includes synthesis of new six membered heterocyclic rings with effective amino group using the reaction of benzylideneacetophenone (chalcone) (1) with thiourea or urea in alcoholic basic medium to form: 1,3-thiazen-2-amine (2), and 1,3-oxazin-2-amine (8) respectively. The diazotization reaction was carried out with sodium nitrite in presence of hydrochloric acid to form diazonium salts which suffered coupling reaction with naphthols and phenols in the presence of sodium hydroxide to form colored azo dyes (4-7, and 10-13). o-methylation reaction of compounds (7) and (10) yielded : 1,3-thiazin -2-yl-diazenyl (14), and 1,3-oxazin-2-yl-diazenyl (15) respectively.The new compounds were characterized using various physical techniques like: UV-Vis., FT-IR, and 1HNMR spectra. Some new compounds were tested against bacteria.

scholarly journals Aggregation behavior in naphthalene-appended diketopyrrolopyrrole derivatives and its gas adsorption impact on surface potential

2019 ◽  
Vol 7 (32) ◽  
pp. 9954-9965 ◽  
Author(s):  
Gitish K. Dutta ◽  
S. Kasthuri ◽  
Gobinath Marappan ◽  
Surya Velappa Jayaraman ◽  
Yuvaraj Sivalingam ◽  
...  
Keyword(s):  
Surface Potential ◽  
Gas Adsorption ◽  
Coupling Reaction ◽  
Cross Coupling ◽  
Aggregation Behavior ◽  
Cross Coupling Reaction

Diketopyrrolopyrrole derivatives containing phenyl and thiophene units adorned with alkoxynaphthalene (Naph-PDPP and Naph-TDPP) were synthesized by a Suzuki cross-coupling reaction. SKP measurements were carried out upon exposure to different VOCs.

Visible light initiated amino group ortho-directed copper(i)-catalysed aerobic oxidative C(sp)–S coupling reaction: synthesis of substituted 2-phenylbenzothiazoles via thia-Wolff rearrangement

2020 ◽  
Vol 56 (26) ◽  
pp. 3781-3784 ◽  
Author(s):  
Mandapati Bhargava Reddy ◽  
Ramasamy Anandhan
Keyword(s):  
Visible Light ◽  
Coupling Reaction ◽  
Reaction Synthesis ◽  
Amino Group ◽  
Terminal Alkynes ◽  
Wolff Rearrangement ◽  
Visible Light Driven

A facile amino group ortho-directed visible-light-driven Cu(i)-catalysed aerobic oxidative C(sp)–S coupling reaction of a dimer of 2-aminothiophenol with terminal alkynes was achieved. The resulting alkynyl sulfides was converted to 2-phenylbenzothiazole via “thia-Wolff rearrangement”.

Simultaneous reduction of nitro- to amino-group in the palladium-catalyzed Suzuki cross-coupling reaction

2008 ◽  
Vol 49 (16) ◽  
pp. 2634-2637 ◽  
Author(s):  
Heng-Shan Wang ◽  
Ying-Chun Wang ◽  
Ying-Ming Pan ◽  
Shu-Lin Zhao ◽  
Zhen-Feng Chen
Keyword(s):  
Coupling Reaction ◽  
Cross Coupling ◽  
Amino Group ◽  
Simultaneous Reduction ◽  
Cross Coupling Reaction ◽  
Palladium Catalyzed

Synthesis and properties of some gelatin derivatives with substituents at the amino group

1965 ◽  
Vol 15 (10) ◽  
pp. 479-488
Author(s):  
R. C. Clark ◽  
W. G. Cobbett ◽  
J. A. Gibbs ◽  
R. T. Jones ◽  
A. A. Leach ◽  
...  
Keyword(s):  
Amino Group

Simultaneous Spectrophotometric Determination of Salbutamol by Coupling with Diazotized 4-Aminobenzoic acid

2017 ◽  
Vol 8 (1) ◽  
Author(s):  
Hind Hadi ◽  
Gufran Salim
Keyword(s):  
Pharmaceutical Preparations ◽  
Coupling Reaction ◽  
Dosage Forms ◽  
Water Soluble ◽  
Trace Determination ◽  
Aminobenzoic Acid ◽  
Optimum Conditions ◽  
Colored Product ◽  
Versus Concentration

A simple, rapid and sensitive spectrophotmetric method for trace determination of salbutamol (SAL) in aqueous solution and in pharmaceutical preparations is described. The method is based on the diazotization coupling reaction of the intended compound with 4-amino benzoic acid (ABA) in alkaline medium to form an intense orange, water soluble dye that is stable and shows maximum absorption at 410 nm. A graph of absorbance versus concentration indicates that Beer’s law is obeyed over the concentration range of 0.5-30 ppm, with a molar absorbtivity 3.76×104 L.mol-1 .cm-1 depending on the concentration of SAL. The optimum conditions and stability of the colored product have been investigated and the method was applied successfully to the determination of SAL in dosage forms.

Ferromagnetic Chain Based on Verdazyl-Nitroxide Diradical

2020 ◽  
Author(s):  
Evgeny Tretyakov ◽  
Svetlana Zhivetyeva ◽  
Pavel Petunin ◽  
Dmitry Gorbunov ◽  
Nina Gritsan ◽  
...  
Keyword(s):  
Coupling Reaction ◽  
Cross Coupling ◽  
Ferromagnetic Coupling ◽  
Nitronyl Nitroxide ◽  
Triplet Ground State ◽  
One Dimensional ◽  
Cross Coupling Reaction ◽  
Palladium Catalyzed ◽  
Ferromagnetic Chain ◽  
High Yields

<p>Verdazyl-nitroxide diradicals were synthesized using the palladium-catalyzed cross-coupling reaction of the corresponding iodoverdazyls with a nitronyl nitroxide-2-ide gold(I) complex with high yields (up to 82%). The synthesized diradicals were found to be highly thermally stable and have a singlet (D<i>E</i><sub>ST</sub> » -64 cm<sup>–1</sup>) or triplet ground state (D<i>E</i><sub>ST</sub> ³ 25 and 100 cm<sup>–1</sup>), depending on which canonical hydrocarbon diradical type they belong to. Upon crystallization, triplet diradicals form unique one-dimensional (1D) spin <i>S</i> = 1 chains of organic diradicals with intrachain ferromagnetic coupling of <i>J</i>′/<i>k</i><sub>B</sub> from 3 to 6 K.</p>

An Iron-Based Catalyst Enables The Enantioconvergent Synthesis of Chiral 1,1-Diarylalkanes Through a Suzuki-Miyaura Cross-Coupling Reaction

2020 ◽  
Author(s):  
Chet Tyrol ◽  
Nang Yone ◽  
Connor Gallin ◽  
Jeffery Byers
Keyword(s):  
Coupling Reaction ◽  
Cross Coupling ◽  
Coupling Reactions ◽  
Radical Intermediates ◽  
Cross Coupling Reactions ◽  
Cross Coupling Reaction ◽  
Boronic Esters ◽  
Carbon Centered Radical ◽  
Iron Based ◽  
High Yields

By using an iron-based catalyst, access to enantioenriched 1,1-diarylakanes was enabled through an enantioselective Suzuki-Miyaura crosscoupling reaction. The combination of a chiral cyanobis(oxazoline) ligand framework and 1,3,5-trimethoxybenzene additive were essential to afford high yields and enantioselectivities in cross-coupling reactions between unactivated aryl boronic esters and a variety of benzylic chlorides, including challenging ortho-substituted benzylic chloride substrates. Mechanistic investigations implicate a stereoconvergent pathway involving carbon-centered radical intermediates.

Ni(0)-Catalyzed α-Allylic Alkylation of Regular Ketones with 1,3-Dienes under pH and Redox-neutral Conditions

2019 ◽  
Author(s):  
Tiantian Chen ◽  
Yang Yang ◽  
Liyu Xie ◽  
Haijian Yang ◽  
Guangbin Dong ◽  
...  
Keyword(s):  
Oxidative Addition ◽  
Coupling Reaction ◽  
Cross Coupling ◽  
Dual Role ◽  
Allylic Alkylation ◽  
Cross Coupling Reaction ◽  
Neutral Conditions

<p>We report a Ni(0)-catalyzed cross coupling reaction between simple ketones and 1,3-dienes. A variety of a-allylic alkylation products were formed in an 1,2-addition manner with excellent regioselectivity. Water was found to significantly accelerate this transformation. A HO-Ni-H species generated from oxidative addition of Ni(0) to H<sub>2</sub>O is proposed to play a “dual role” in activating both the ketone and the diene substrate.</p>

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