نتایج جستجو برای: amino functionalized chitosanm

تعداد نتایج: 227274  

Journal: :Chemical communications 2011
Ming-Qing Hua Lian Wang Han-Feng Cui Jing Nie Xiao-Ling Zhang Jun-An Ma

An efficient, catalytic, diastereo- and enantioselective conjugate addition of N-(diphenylmethylene)glycine tert-butyl ester to β-aryl substituted enones was realized in the presence of 1 mol% of newly desired dinuclear N-spiro-ammonium salts, affording functionalized α-amino acid derivatives in 57-98% yields with high diastereoselectivity (up to 99:1 dr) and enantioselectivity (up to 96.5:3.5 ...

2012
Piyush Kumar Agarwal Meena Devi Dathi Mohammad Saifuddin Bijoy Kundu

A mild, efficient and versatile method has been developed for the construction of a functionalized natural product, meridianin, and its post conversion to pyrimido-β-carboline by cationic π- cyclization. The strategy involves the introduction of an amino group at the C-5 of the pyrimidine ring and utilizing the nucleophilictiy of the C-2 in the indole ring to facilitate cationic π-cyclization.

Journal: :Chemical communications 2015
Qu Zhang Dawei Zhang Xiaodong Li Xiaohui Liu Wenjun Zhang Lei Han Junfeng Fang

Three amino-functionalized fluorene oligomers with different solubility were developed as cathode interfacial materials for inverted polymer solar cells (I-PSCs). By side chain design, we solved the interface layer erosion problem for I-PSCs, and the devices exhibit a power conversion efficiency as high as 8.94%.

Journal: :Organic & biomolecular chemistry 2015
Pauline Petiot Julien Dansereau Martin Hébert Imene Khene Tabinda Ahmad Samira Samaali Maxime Leroy Francis Pinsonneault Claude Y Legault Alexandre Gagnon

The O-arylation of 1,2-aminoalcohols using functionalized triarylbismuth reagents is reported. The reaction can be performed using substoichiometric amounts of copper acetate and operates under mild conditions. Good functional group tolerance is observed, giving access to a range of β-aryloxyamines. The effect provided by the amino group in the arylation reaction is investigated.

Journal: :Chemical communications 2013
Sébastien Vaesen Vincent Guillerm Qingyuan Yang Andrew D Wiersum Bartosz Marszalek Barbara Gil Alexandre Vimont Marco Daturi Thomas Devic Philip L Llewellyn Christian Serre Guillaume Maurin Guy De Weireld

A combination of adsorption, microcalorimetry, infra-red spectroscopy and modeling has been implemented to reveal the potential of the H2S resistant amino-functionalized Ti MOF MIL-125 porous solid for the concomitant elimination of CO2 and H2S from biogas and natural gas.

Journal: :Chemical communications 2014
Li Xu Zece Zhu Xiang Zhou Jingui Qin Chuluo Yang

We designed and synthesized a new amino-functionalized tetraphenylethene (TPE) derivative as a highly sensitive dye for the detection of dsDNA and oligonucleotide in both solution and a gel matrix. We further revealed that the cis configuration dye showed a much higher sensitivity than its trans isomer for the first time.

2013
Raghunath Toche Ravindra Janrao

Simple and rapid synthesis of various diversely functionalized unprotected 4-amino-2-chloroquinoline-3-aryl derivatives were synthesized in high yields by Suzuki cross-coupling reaction using microwave irradiation in water and in presence of tetrakis(triphenylphosphine)palladium(0). Electronic effects of o-substituted functional groups on the reaction were studied conclusively.

Journal: :Chemical communications 2011
Yousef Pourghaz Prateek Dongare David W Thompson Yuming Zhao

Side-chain functionalized poly(p-phenylene ethynylene)s (PPEs) carrying triazole linkers, amino donors/receptors, and solubilizing groups have been found to yield remarkably high efficiency of fluorescence turn-on sensing for Zn(2+) and Cd(2+) ions in THF, and for H(+) and Cd(2+) ions in water.

2013
Raoni S B Gonçalves Michael Dos Santos Guillaume Bernadat Danièle Bonnet-Delpon Benoit Crousse

Functionalized 3-trifluoromethyl-2-isoxazolines and 3-trifluoromethylisoxazoles were easily prepared from trifluoromethyl aldoxime 2 under mild conditions by using DIB as oxidant. Theoretical studies of the reactivity of trifluoroacetonitrile oxide 4 toward olefins and alkynes were carried out. The 3-trifluoromethyl-2-isoxazolines were ring-opened with NaBH4 and NiCl2 to yield the corresponding...

Journal: :Chemical communications 2013
Robert Westphal Simon Waltzer Ursula Mackfeld Michael Widmann Jürgen Pleiss Maryam Beigi Michael Müller Dörte Rother Martina Pohl

We report the first rationally designed (S)-selective MenD from E. coli for the synthesis of functionalized α-hydroxy ketones. By mutation of two amino acids in the active site stereoselectivity of the (R)-selective EcMenD (ee > 93%) was inverted giving access to (S)-5-hydroxy-4-oxo-5-phenylpentanoate derivatives with stereoselectivities up to 97% ee.

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