Výsledky vyhledávání - "Ashish Kumar Dhara"

Visible-Light-Mediated Synthesis of Substituted Phenazine and Phenoxazinone Using Eosin Y as a Photoredox Catalyst

Autor: Basab Bijayi Dhar, Ashish Kumar Dhara, Sayantan Maity

Publikováno v: Organic Letters. 23:3269-3273

This paper describes an efficient, sustainable, one-step procedure for synthesizing substituted phenazines and phenoxazinones from commercially available ortho-substituted aromatic amines with very good yield (≥80%) in water. The procedure uses eos

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d0692fa7c1bec996c9844b354c37526b
https://doi.org/10.1021/acs.orglett.1c00725

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Aerobic oxidation of alcohol by model complexes relevant to metal site galactose oxidase: role of copper(I) intermediate, evidence for the generation of end-on copper(II)–OOH species and catalytic promiscuity for oxidation of benzyl alcohol, catechol and o-aminophenol

Autor: Sheela Kumari, U. P. Singh, Ashish Kumar Dhara, Kaushik Ghosh, Kapil Kumar

Publikováno v: Transition Metal Chemistry. 45:159-172

Tridentate ligands having meridional NNO donor centres were designed and synthesized mimicking the copper coordination in the metal site of galactose oxidase enzyme. Mononuclear copper complexes [Cu(L1)Cl] (1) (L1H = (E)-2-((2-phenyl-2-(pyridin-2-yl)

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::2c728a8bfafbc4be1c538f4af409146b
https://doi.org/10.1007/s11243-019-00367-7

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Cu(i) complexes obtained via spontaneous reduction of Cu(ii) complexes supported by designed bidentate ligands: bioinspired Cu(i) based catalysts for aromatic hydroxylation

Autor: U. P. Singh, Ramasamy Mayilmurugan, Ashish Kumar Dhara, Sethuraman Muthuramalingam, Sheela Kumari, Kaushik Ghosh

Publikováno v: Dalton Transactions. 49:13829-13839

Copper(I) complexes [Cu(L1–7)2](ClO4) (1–7) of bidentate ligands (L1–L7) have been synthesized via spontaneous reduction and characterized as catalysts for aromatic C–H activation using H2O2 as the oxidant. The single crystal X-ray structure

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https://doi.org/10.1039/d0dt02413a

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Cu(I) complexes obtained

Autor: Sheela, Kumari, Sethuraman, Muthuramalingam, Ashish Kumar, Dhara, U P, Singh, Ramasamy, Mayilmurugan, Kaushik, Ghosh

Publikováno v: Dalton transactions (Cambridge, England : 2003). 49(39)

Copper(i) complexes [Cu(L1-7)2](ClO4) (1-7) of bidentate ligands (L1-L7) have been synthesized via spontaneous reduction and characterized as catalysts for aromatic C-H activation using H2O2 as the oxidant. The single crystal X-ray structure of 1 exh

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=pmid________::60e84b3c1b27874632c3e449348ffb19
https://pubmed.ncbi.nlm.nih.gov/33001072

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Non-Innocent Property of Tridentate Ligand in Novel Cobalt Complex : Crystal Structure and Evidences for Cobalt(II) Phenoxyl Radical Complex Formation

Autor: Ashish Kumar Dhara, Sheela Kumari, Udai P. Singh, Kaushik Ghosh, Kapil Kumar

Publikováno v: ChemistrySelect. 1:3933-3937

A phenoxyl radical complex [CoII(L)(L+)]NO3 (where LH=(E)-2,4-di-tert-butyl-6-((2-phenyl-2-(pyridin-2-yl)hydrazono)methyl)phenol and H=dissociable proton) was synthesized at room temperature in aerobic condition and was characterized. Crystal structu

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::616f3cd2bd4b9cf01888f38f94916312
https://doi.org/10.1002/slct.201600647

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Radical pathways and O2 participation in benzyl alcohol oxidation, and catechol and o-aminophenol oxidase activity studies with novel zinc complexes: an experimental and theoretical investigation

Autor: Udai P. Singh, Ashish Kumar Dhara, Kaushik Ghosh

Publikováno v: Inorganic Chemistry Frontiers. 3:1543-1558

Diphenoxo bridged dinuclear zinc complexes [Zn2(OMe-Phimp)2(Cl)2] (1) (OMe-PhimpH = (E)-4-methoxy-2-((2-phenyl-2-(pyridin-2-yl)hydrazono)methyl)phenol), [Zn2(Me-Phimp)2(Cl)2] (2) (Me-PhimpH = (E)-4-methyl-2-((2-phenyl-2-(pyridin-2-yl)hydrazono)methyl

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::df6fbced11535f6e4bdf2a48a29c3310
https://doi.org/10.1039/c6qi00356g

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Role of substituents present in bidentate ligand frame of Cu(I) catalysts on Sonogashira cross coupling reactions

Autor: Kaushik Ghosh, Kiran Mawai, Anand Ratnam, Aurobinda Mohanty, Virendra Kumar Chaudhary, Sheela Kumari, Ashish Kumar Dhara

Publikováno v: Journal of Organometallic Chemistry. 928:121367

Cu(I) catalysts {[Cu(L1−4)Cl(PPh3)] where L1−4 = condensed product of 2-(1-phenylhydrazinyl)-pyridine with different benzaldehydes} were synthesized and characterized by 1H NMR, 31P NMR, UV–Vis and IR techniques. Complex 2 structure was authent

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::f8243a08ff059e256d8c32d8de51d59d
https://doi.org/10.1016/j.jorganchem.2020.121367

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Aminoalcohols and benzoates-friends or foes? Tuning nuclearity of Cu(ii) complexes, studies of their structures, magnetism, and catecholase-like activities as well as performing DFT and TDDFT studies

Autor: Ming-Liang Tong, Farasha Sama, Mukul Raizada, Istikhar A. Ansari, Musheer Ahmad, Muhammad Nadeem Akhtar, M. Shahid, Zafar A. Siddiqi, Yan-Cong Chen, Ashish Kumar Dhara

Publikováno v: Dalton transactions (Cambridge, England : 2003). 46(30)

Herein, the coordination chemistry of a series of Cu(II) complexes of various aminoalcohol and benzoate ligands was explored. The pH-dependent reactions of copper(II) salts with propanolamine (Hpa), N-methyl diethanolamine (H2mdea), triethanolamine (

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::fc09940b92a32113376c6723c4c20d35
https://pubmed.ncbi.nlm.nih.gov/28678284

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Spontaneous Reduction of Mononuclear High-Spin Iron(III) Complexes to Mononuclear Low-Spin Iron(II) Complexes in Aqueous Media and Nuclease Activity via Self-Activation

Autor: Nidhi Tyagi, Udai P. Singh, Ashish Kumar Dhara, Kaushik Ghosh

Publikováno v: Chemistry - An Asian Journal. 10:350-361

Mononuclear high-spin [Fe(III) (Pyimpy)Cl3 ]⋅2 CH2 Cl2 (1⋅2 CH2 Cl2 ) and [Fe(III) (Me-Pyimpy)Cl3 ] (2), as well as low-spin Fe(II) (Pyimpy)2 ](ClO4 )2 (3) and [Fe(II) (Me-Pyimpy)2 ](ClO4 )2 (4) complexes of tridentate ligands Pyimpy and Me-Pyimp

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::62c47b756c0152c47ce1acd17db946bd
https://doi.org/10.1002/asia.201402954

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The influence of the tertiary butyl group in the ligand frame on the catalytic activities, DNA cleavage ability and cytotoxicity of dinuclear nickel(II) complexes

Autor: Kapil Kumar, Pankaj Verma, Kaushik Ghosh, Virendra Kumar Chaudhary, Partha Pratim Roy, Nathani Sandip, Ashish Kumar Dhara

Publikováno v: Inorganica Chimica Acta. 495:118993

Dinuclear phenoxo-bridged nickel complexes [Ni2(L1)H2O(CH3COO)](1) and [Ni2(L2)H2O(CH3COO)](2) (where L1H3° = 2-(2′-hydroxyphenyl)-1,3-bis[4-(2-hydroxyphenyl)-3-azabutenyl]-3-enyl]-1,3-imidazolidine and L2H3° = 2-(3,5-di-tert-butyl-2-hydroxypheny

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::f8537e393e05eb3cbcdfee2c38681222
https://doi.org/10.1016/j.ica.2019.118993

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