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Article ; Online: Enhanced photocatalytic performance of the N-rGO/g-C

Gupta, Shalu / Kumar, Rakesh

2024 Volume 16, Issue 12, Page(s) 6109–6131

Abstract: ... of reduced graphene oxide (rGO) and graphitic carbon nitride (g-C ...

Abstract	This paper describes the synthesis and analysis of a photocatalyst made from a combination of reduced graphene oxide (rGO) and graphitic carbon nitride (g-C
Language	English
Publishing date	2024-03-21
Publishing country	England
Document type	Journal Article
ZDB-ID	2515664-0
ISSN	2040-3372 ; 2040-3364
ISSN (online)	2040-3372
ISSN	2040-3364
DOI	10.1039/d3nr06203a
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Article ; Online: Regioselective Addition of Sulfur and Amine Nucleophiles To Assemble S═C-S, S-N, and Umpolung C-N Bonds: Exploration of the -CBr

Gupta, Ankush / Gururaja, Guddeangadi N

Organic letters

2024 Volume 26, Issue 9, Page(s) 1874–1879

Abstract: The regioselective addition of sulfur and amine nucleophiles to a - ... ...

Abstract	The regioselective addition of sulfur and amine nucleophiles to a -CBr
Language	English
Publishing date	2024-02-27
Publishing country	United States
Document type	Journal Article
ISSN	1523-7052
ISSN (online)	1523-7052
DOI	10.1021/acs.orglett.4c00157
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Article ; Online: High rates of nitrogen removal in aerated VFCWs treating sewage through C-N-S cycle.

Soti, Abhishek / Mohan Kulshreshtha, Niha / Singh, Saurabh / Samaria, Akshat / Brighu, Urmila / Dontireddy, Gangadhara / Banda, Sravan / Bhushan Gupta, Akhilendra

Bioresource technology

2024 Volume 399, Page(s) 130620

Abstract: The efficiency of deep aerated vertical flow constructed wetlands (DA-VFCWs) being operated in Hyderabad, India, was evaluated herein using physicochemical analysis and 16S rRNA amplicon sequencing. The results showed 2-4-fold higher removal rate ... ...

Abstract	The efficiency of deep aerated vertical flow constructed wetlands (DA-VFCWs) being operated in Hyderabad, India, was evaluated herein using physicochemical analysis and 16S rRNA amplicon sequencing. The results showed 2-4-fold higher removal rate coefficients for Biochemical oxygen demand (1.32---3.53 m/d) and nitrogen (0.88--1.36 m/d) in DA-VFCWs than those of passive VFCWs. Elevated sulfate concentration in the DA-VFCWs effluent (84-113 mg/L) indicated possibility of sulfur-driven autotrophic denitrification (SDAD) as a major pathway operating in these wetlands besides the classical nitrogen removal pathways. The presence of nitrifiers (3.09-10.02 %), heterotrophic and aerobic denitrifiers (0.79-0.83 %), anammox bacteria (1.31-2.22 %) and SDAD bacteria (0.08-0.73 %) in the biofilm samples collected from the DA-VFCWs exemplify an interplay of Carbon-Nitrogen-Sulfur cycles in these systems. If proven, the presence of an operational SDAD pathway in DA-VFCWs can help reduce surface area requirement in VFCWs substantially besides alleviating biological clogging of the wetland substrate.
MeSH term(s)	Sewage ; Denitrification ; Nitrogen/metabolism ; RNA, Ribosomal, 16S/genetics ; Wetlands ; Sulfur ; Nitrification
Chemical Substances	Sewage ; Nitrogen (N762921K75) ; RNA, Ribosomal, 16S ; Sulfur (70FD1KFU70)
Language	English
Publishing date	2024-03-21
Publishing country	England
Document type	Journal Article
ZDB-ID	1065195-0
ISSN	1873-2976 ; 0960-8524
ISSN (online)	1873-2976
ISSN	0960-8524
DOI	10.1016/j.biortech.2024.130620
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Article ; Online: Transforming Pharmaceutical Synthesis with Sein-E-B Nanocomposite Photocatalyst through 1,4-NAD(P)H Cofactor Regeneration and C-N Bond Activation.

Shukla, Ravindra / Yadav, Rajesh / Gole, Vitthal / Singhal, Rajat / Shahin, Rehana / Mishra, Shaifali / Singh, Satyam / Sharma, Kanchan / Baeg, Jin-Ook / El-Hiti, Gamal / Yadav, Krishna / Gupta, Navneet Kumar

Chemistry & biodiversity

2024 , Page(s) e202400329

Abstract: ... the generated Sein-E-B catalytic activity as a nanocomposite for 1,4-NADH/NADPH re-formation and C-N bond ... and C-N bond creation between pyrrole and aryl halides. ...

Abstract	The need for sunlight chemical renewal and contemporary organic transformation has fostered the advancement of environmentally friendly photocatalytic techniques. For the first time, we report on the novel crafting of a bright future with selenium-infused Eosin-B (Sein-E-B) nanocomposite photocatalysts in this work. The Sein-E-B nanocomposite materials were created using a hydrothermal process for solar chemical regeneration and organic transformation under visible light. The synthesized samples were subjected to UV-DRS-visible spectroscopy, FT-IR, SEM, EDX, EIS and XRD analysis. The energy band gap of the Sein-E-B nanocomposite photocatalyst was measured using UV-DRS, and the result was around 2.06 eV. to investigate the generated Sein-E-B catalytic activity as a nanocomposite for 1,4-NADH/NADPH re-formation and C-N bond activation. This novel photocatalyst offers a promising alternative for the regeneration of solar chemicals and C-N bond creation between pyrrole and aryl halides.
Language	English
Publishing date	2024-04-08
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	2139001-0
ISSN	1612-1880 ; 1612-1872
ISSN (online)	1612-1880
ISSN	1612-1872
DOI	10.1002/cbdv.202400329
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Article: Enhancing the efficiency of nitrogen removing bacterial population to a wide range of C:N ratio (1.5:1 to 14:1) for simultaneous C & N removal

Saha, Shaswati / Gupta, Rohan / Sethi, Shradhanjali / Biswas, Rima

Frontiers of environmental science & engineering. 2022 Aug., v. 16, no. 8

2022

Abstract: High C:N ratio in the wastewater limits biological nitrogen removal (BNR), especially in anammox ... as ‘Methammox’, was investigated for simultaneous removal of COD (C) and ammonia (N) at C:N ratio 1.5:1 to 14:1 ... C:N ratio (≼2:1) and high C:N ratio (≽9:1). The population abundance of methanogens was reasonably ...

Abstract	High C:N ratio in the wastewater limits biological nitrogen removal (BNR), especially in anammox based technologies. The present study attempts to improve the COD tolerance of the BNR process by associating methanogens with nitrogen removing bacterial (NRB) populations. The new microbial system coined as ‘Methammox’, was investigated for simultaneous removal of COD (C) and ammonia (N) at C:N ratio 1.5:1 to 14:1. The ammonia removal rate (11.5 mg N/g VSS/d) and the COD removal rates (70.6 mg O/g VSS/d) of Methammox was close to that of the NRB (11.1 mg N/g VSS/d) and the methanogenic populations (77.9 mg O/g VSS/d), respectively. The activities established that these two populations existed simultaneously and independently in ‘Methammox’. Further studies in biofilm reactor fetched a balanced COD and ammonia removal (55%–60%) at a low C:N ratio (≼2:1) and high C:N ratio (≽9:1). The population abundance of methanogens was reasonably constant, but the nitrogen removal shifted from mixotrophy to heterotrophy as the C:N ratio shifted from low (C:N≼2:1) to high (C:N≽9:1). The reduced autotrophic NRB (ammonia- and nitrite-oxidizing bacteria and Anammox) population at a high C:N ratio was compensated by the fermentative group that could carry out denitrification heterotrophically. The functional plasticity of the Methammox system to adjust to a broad C:N ratio opens new frontiers in biological nitrogen removal of high COD containing wastewaters.
Keywords	ammonia ; anaerobic ammonium oxidation ; biofilm ; carbon nitrogen ratio ; chemical oxygen demand ; denitrification ; methanogens ; nitrogen ; plasticity ; species abundance ; wastewater
Language	English
Dates of publication	2022-08
Size	p. 101.
Publishing place	Higher Education Press
Document type	Article
ZDB-ID	2662203-8
ISSN	2095-221X ; 2095-2201
ISSN (online)	2095-221X
ISSN	2095-2201
DOI	10.1007/s11783-022-1522-y
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Article: Metal-free electrochemical regioselective aromatic C–H bromination of N,N-disubstituted anilines using propargyl bromide as the unprecedented bromine source

Chowdhury, Sushobhan / Pandey, Shubham / Gupta, Ashutosh / Kumar, Ajay

Tetrahedron. 2022 June 19,

2022

Abstract: ... method for the highly regioselective monobromination of N,N-disubstituted anilines has been disclosed ...

Abstract	Source of a functional group is always an important factor in the chemical synthesis. Herein a new method for the highly regioselective monobromination of N,N-disubstituted anilines has been disclosed using propargyl bromide as the unconventional bromine source under electrochemical condition. Unlike other bromine sources, neither it requires any polarization nor any activator. The reaction smoothly proceeds at room temperature without using any metal catalyst or bromide salt. For unsubstituted anilines regioselective para-bromination was observed whereas both meta- and para-substituted anilines undergo predominant ortho-bromination leading to the corresponding bromoanilines in good yields. Plausible mechanism has been depicted with supporting B3LYP/6-31G DFT calculations to explain the relative energy driven process.
Keywords	ambient temperature ; bromination ; bromine ; catalysts ; electrochemistry ; energy ; regioselectivity ; synthesis
Language	English
Dates of publication	2022-0619
Publishing place	Elsevier Ltd
Document type	Article
Note	Pre-press version
ZDB-ID	204285-x
ISSN	1464-5416 ; 0040-4020 ; 0563-2064
ISSN (online)	1464-5416
ISSN	0040-4020 ; 0563-2064
DOI	10.1016/j.tet.2022.132902
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Article ; Online: Oxidative C-C bond formation and C-N bond cleavage catalyzed by complexes of copper(i) with acridine based (E N E) pincers (E = S/Se), recyclable as a catalyst.

Gupta, Sonu / Dubey, Pooja / Singh, Ajai K / Jain, Nidhi

Dalton transactions (Cambridge, England : 2003)

2019 Volume 48, Issue 27, Page(s) 10129–10137

Abstract: ... with unactivated terminal alkynes, and cleavage of the benzylic (C-N) bond of N,N dimethylbenzylamines under ... pincer type (E N E) ligand), were synthesized and found to be thermally stable, and moisture and air ...

Abstract	Copper(i) complexes of 4,5-bis((phenylthio/seleno)methyl)acridine, [CuLBr] (C1 and C2) (L = L1/L2; pincer type (E N E) ligand), were synthesized and found to be thermally stable, and moisture and air insensitive. The complexes and ligands were characterized by multinuclei NMR and single crystal X-ray diffraction. In both complexes C1 and C2, ligands L1 and L2 coordinate with Cu in a pincer mode furnishing two six-membered chelate rings, with the distorted tetrahedral geometry of donor atoms around Cu. The Cu-S and Cu-Se bond lengths (Å) are 2.2482(17)-2.2979(16) and 2.3603(14)-2.4177(13) respectively. These complexes served as efficient catalysts for cross dehydrogenative coupling of unactivated tertiary amines with unactivated terminal alkynes, and cleavage of the benzylic (C-N) bond of N,N dimethylbenzylamines under oxidative solvent-free conditions. The reactions were found to be highly selective, and no over-oxidation to acid was observed. A low catalytic loading of 1.0 mol% was good enough to bring about both these transformations with recyclability up to five times.
Language	English
Publishing date	2019-06-10
Publishing country	England
Document type	Journal Article
ZDB-ID	1472887-4
ISSN	1477-9234 ; 1364-5447 ; 0300-9246 ; 1477-9226
ISSN (online)	1477-9234 ; 1364-5447
ISSN	0300-9246 ; 1477-9226
DOI	10.1039/c9dt01766f
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Article: 3d-transition metal catalyzed C–H to C–N bond formation: An update

Singh, Ritesh / Sathish, Elagandhula / Gupta, Ashis K. / Goyal, Sophiya

Tetrahedron. 2021 Nov. 05, v. 100

2021

Abstract: ... to C–N bond formation through different mechanistic manifolds in order to make the transformation more ... Direct C–H bond amination is an emerging area of research among synthetic community owing ... to prevalence of N-bearing scaffolds in various fields of importance to humankind. In this direction, use of 3d ...

Abstract	Direct C–H bond amination is an emerging area of research among synthetic community owing to prevalence of N-bearing scaffolds in various fields of importance to humankind. In this direction, use of 3d transition metals (Cu, Co, Ni and Fe) have recently emerged as promising class of catalytic promoters for C–H to C–N bond formation through different mechanistic manifolds in order to make the transformation more sustainable and industrially oriented. Herein, we provide an update on 3d-transition metal mediated C–H bond amination reactions showcasing the recent developments in this area, thus clearly outlining the scope and limitations of the developed methods and illustrating the focus area to be addressed in the near future.
Keywords	amination ; catalytic activity ; transition elements
Language	English
Dates of publication	2021-1105
Publishing place	Elsevier Ltd
Document type	Article
ZDB-ID	204285-x
ISSN	1464-5416 ; 0040-4020 ; 0563-2064
ISSN (online)	1464-5416
ISSN	0040-4020 ; 0563-2064
DOI	10.1016/j.tet.2021.132474
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Article ; Online: Novel C-3-(N-alkyl-aryl)-aminomethyl rifamycin SV derivatives exhibit activity against rifampicin-resistant Mycobacterium tuberculosis RpoB

Zloh, Mire / Gupta, Megha / Parish, Tanya / Brucoli, Federico

European journal of medicinal chemistry

2021 Volume 225, Page(s) 113734

Abstract: ... linkage to connect the aromatic ring tails with the rifamycin naphthoquinone core. Eight novel C3-(N-alkyl ...

Abstract	Antimicrobial resistance is a main concern in tuberculosis treatment and is often associated with the emergence of Mycobacterium tuberculosis strains resistant to rifampicin (RIF), which is one of the cornerstones of tuberculosis chemotherapy. In this study, aminoalkyl-aromatic ring tails were appended to the C3 position of rifamycin core to assess the role of C3 substitutions to the anti-mycobacterial activity of the rifamycin antibiotics. The typical hydrazone unit of RIF was replaced by an amino-alkyl linkage to connect the aromatic ring tails with the rifamycin naphthoquinone core. Eight novel C3-(N-alkyl-aryl)-aminoalkyl analogues of rifamycin SV were synthesised and screened in vitro against wild-type HR37Rv and "hypervirulent" HN-878 strains, and a panel of rifampicin-resistant M. tuberculosis clinical isolates carrying mutations at the 522, 531 and 455 positions of the rpoB gene (RpoB
MeSH term(s)	Antitubercular Agents/chemical synthesis ; Antitubercular Agents/chemistry ; Antitubercular Agents/pharmacology ; Binding Sites/drug effects ; Dose-Response Relationship, Drug ; Microbial Sensitivity Tests ; Molecular Structure ; Mycobacterium tuberculosis/drug effects ; Rifamycins/chemical synthesis ; Rifamycins/chemistry ; Rifamycins/pharmacology ; Structure-Activity Relationship ; Tuberculosis, Multidrug-Resistant/drug therapy
Chemical Substances	Antitubercular Agents ; Rifamycins ; rifamycin SV (DU69T8ZZPA)
Language	English
Publishing date	2021-08-08
Publishing country	France
Document type	Journal Article
ZDB-ID	188597-2
ISSN	1768-3254 ; 0009-4374 ; 0223-5234
ISSN (online)	1768-3254
ISSN	0009-4374 ; 0223-5234
DOI	10.1016/j.ejmech.2021.113734
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Article: Rh(III)-Catalyzed C(8)–H Activation of Quinoline N-Oxides: Regioselective C–Br and C–N Bond Formation

Dhiman, Ankit Kumar / Gupta, Shiv Shankar / Sharma, Ritika / Kumar, Rakesh / Sharma, Upendra

Journal of organic chemistry. 2019 July 01, v. 84, no. 20

2019

Abstract: ... of quinoline N-oxide was developed. The transformation was found to be successful up to gram scale ... rhodacycle with quinoline N-oxide as a key intermediate for regioselective C8-functionalization. In addition ... NFSI (N-fluorobis(phenylsulfonyl)-imide) was explored as an amidating reagent for C8-amidation ...

Abstract	A highly efficient and regioselective Rh(III)-catalyzed protocol for C8-bromination and amidation of quinoline N-oxide was developed. The transformation was found to be successful up to gram scale with excellent functional group tolerance and wide substrate scope. The mechanistic study revealed five-membered rhodacycle with quinoline N-oxide as a key intermediate for regioselective C8-functionalization. In addition, NFSI (N-fluorobis(phenylsulfonyl)-imide) was explored as an amidating reagent for C8-amidation of quinoline N-oxide for the first time.
Keywords	catalytic activity ; chemical bonding ; chemical reactions ; moieties ; nitrogen oxides ; quinoline ; regioselectivity ; rhodium
Language	English
Dates of publication	2019-0701
Size	p. 12871-12880.
Publishing place	American Chemical Society
Document type	Article
ZDB-ID	123490-0
ISSN	1520-6904 ; 0022-3263
ISSN (online)	1520-6904
ISSN	0022-3263
DOI	10.1021/acs.joc.9b01538
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