Zinc oxide surface: a versatile nanoplatform for solvent-free synthesis of diverse isatin derivatives

Kothandapani, Jagatheeswaran; Ganesan, Asaithampi; Mani, Ganesh Kumar; Kulandaisamy, Arockia Jayalatha; Rayappan, John Bosco Balaguru; Ganesan, Subramaniapillai Selva

doi:10.1016/j.tetlet.2016.06.094

Cited by 26 publications

(13 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In particular, the shape of the peak Mn2p 3/2 and the absence of satellite zones around 647 eV, indicate that manganese is mostly found as manganese(III) oxide (Mn 2 O 3 ) [88][89][90]. Likewise, the Zn spectrum ( Figure 9f) also has two main peaks, corresponding to Zn2p 1/2 (~1046 eV) and Zn2p 3/2 (~1023 eV) that indicate the presence of zinc oxide (ZnO) [91,92]. Therefore, Cu, Mn, and Zn are forming oxides, which indicates that the main removal mechanism is the chemical interaction between metal ions and oxygen-containing groups, forming ionic bonds.…”

Section: X-ray Photoelectron Spectrometry (Xps) Analysismentioning

confidence: 97%

Enhanced Heavy Metal Removal from Acid Mine Drainage Wastewater Using Double-Oxidized Multiwalled Carbon Nanotubes

Rodríguez

Leiva

2019

Molecules

View full text Add to dashboard Cite

Due to the unique properties of carbon nanotubes (CNTs), they have attracted great research attention as an emergent technology in many applications including water and wastewater treatment. However, raw CNTs have few functional groups, which limits their use in heavy metal removal. Nevertheless, their removal properties can be improved by oxidation processes that modify its surface. In this study, we assessed the capacity of oxidized and double-oxidized multiwalled carbon nanotubes (MWCNTs) to remove heavy metals ions from acidic solutions. The MWCNTs were tested for copper (Cu), manganese (Mn), and zinc (Zn) removal, which showed an increment of 79%, 78%, and 48%, respectively, with double-oxidized MWCNTs compared to oxidized MWCNTs. Moreover, the increase in pH improved the sorption capacity for all the tested metals, which indicates that the sorption potential is strongly dependent on the pH. The kinetic adsorption process for three metals can be described well with a pseudo-second-order kinetic model. Additionally, in multimetallic waters, the sorption capacity decreases due to the competition between metals, and it was more evident in the removal of Zn, while Cu was less affected. Besides, XPS analysis showed an increase in oxygen-containing groups on the MWCNTs surface after oxidation. Finally, these analyses showed that the chemical interactions between heavy metals and oxygen-containing groups are the main removal mechanism. Overall, these results contribute to a better understanding of the potential use of CNTs for water treatment.

show abstract

Section: X-ray Photoelectron Spectrometry (Xps) Analysismentioning

confidence: 97%

Enhanced Heavy Metal Removal from Acid Mine Drainage Wastewater Using Double-Oxidized Multiwalled Carbon Nanotubes

Rodríguez

Leiva

2019

Molecules

View full text Add to dashboard Cite

show abstract

“…However, in both cases, free (NH)‐indole was used as a substrate. Apart from these methods, C3‐quaternary indolinones 3 can also be prepared by the nucleophilic addition of indole on to isatin derivatives …”

Section: Resultsmentioning

confidence: 97%

“…The C2‐peroxygenated indole on elimination of t BuOH followed by the addition of two molecules of (NMe)‐indole led to the formation of 3a which on further oxidation yielded 4b . To address the reviewers comment, C3‐quaternary indolinone 3a was synthesized separately by closely following a previously reported literature procedure . 3a on subject to the TBHP mediated oxidation reaction condition also gave the product 4b in quantitative yields.…”

Section: Resultsmentioning

confidence: 99%

TBHP Mediated Substrate Controlled Oxidative Dearomatization of Indoles to C2/C3‐Quaternary Indolinones

et al. 2018

Self Cite

View full text Add to dashboard Cite

Oxidative dearomatization of indoles with 70 % aqueous tert‐butylhydroperoxide (TBHP) in the absence of any metal salts/organic solvents gave the corresponding C2/C3‐quaternary indolinones under open‐air reaction conditions. The nature of substituent on the indole nitrogen dictates the type of product formed in these reactions. Free (NH)‐indoles gave C2‐quaternary indolinone derivatives whilst (NR)‐indoles yielded C3‐quaternary indolinones as the major product. Moreover, the addition of an excess amount of TBHP also facilitated the one‐pot transformation of (NR)‐indoles to the corresponding isatin derivatives.

show abstract

“…White powder; m.p. : 294–295 °C (310 °C) [ 16 ]; IR (KBr) cm −1 : 3314, 2959, 1745, 1670, 1618, 1349, 1315, 1168. 1 H-NMR (CDCl 3 ): δ H (ppm) 1.04 (6H, s, 2CH 3 ), 1.12 (6H, s, 2CH 3 ), 2.13 and 2.24 (4H, AB system, J = 16.4 Hz, 2CH 2 ), 2.21 (3H, s, CH 3 ), 2.45 and 2.55 (4H, AB system, J = 17.6 Hz, 2CH 2 ), 6.66 (1H, s, H-Ar), 6.73 (1H, d, J = 8.0 Hz, H-Ar), 6.95 (1H, d, J = 7.6 Hz, H-Ar), 7.46 (1H, s, NH).…”

Section: Methodsmentioning

confidence: 99%

“…For example, MI-219, a spiroindoline-3,3′-pyrrolidine, was described by Wang et al as a potent MDM2 inhibitor [ 7 ]. Xanthenes have been reported to possess pharmacological activities such as antiviral, antibacterial, and anti-inflammatory properties, and are also known as sensitizers in photodynamic therapy (PDT) for abolishing tumor cells [ 8 , 9 , 10 , 11 ].Spiro[indoline-3,9′-xanthene]trione, as a member of spiro compounds, has attracted researchers’ attentions for its unique structure and biological effects since the first report by Lorenc in 1959 [ 12 ], and various catalysts for its synthesis have been developed such as p - tert -Butylcalix[8]arene [ 13 ], p -TSA [ 14 , 15 ], ZnO [ 16 ], ZnFe 2 O 4 [ 17 ], B(HSO 4 ) 3 [ 18 ], HBF 4 supported on silica nanoparticles [ 19 ], and SnCl 4 [ 20 ]. Although these reported protocols have their eligibilities, they also suffer from one or more drawbacks.…”

Section: Introductionmentioning

confidence: 99%

An Efficient Synthesis of Spiro[indoline-3,9′-xanthene]trione Derivatives Catalyzed by Magnesium Perchlorate

Chen

Liang

et al. 2017

Molecules

View full text Add to dashboard Cite

A simple and efficient method for the synthesis of spiro[indoline-3,9′-xanthene]trione derivatives by means of condensation between isatins and 1,3-cyclohexanedione in the presence of a catalytic amount of magnesium perchlorate at 80 °C in 50% aqueous ethanol medium has been described. Notably, the present method offers desirable advantages of good yields, simplicity of workup procedure, easy purification, and reduced reaction times.

show abstract

Zinc oxide surface: a versatile nanoplatform for solvent-free synthesis of diverse isatin derivatives

Cited by 26 publications

References 40 publications

Enhanced Heavy Metal Removal from Acid Mine Drainage Wastewater Using Double-Oxidized Multiwalled Carbon Nanotubes

Enhanced Heavy Metal Removal from Acid Mine Drainage Wastewater Using Double-Oxidized Multiwalled Carbon Nanotubes

TBHP Mediated Substrate Controlled Oxidative Dearomatization of Indoles to C2/C3‐Quaternary Indolinones

An Efficient Synthesis of Spiro[indoline-3,9′-xanthene]trione Derivatives Catalyzed by Magnesium Perchlorate

Contact Info

Product

Resources

About