Wyniki wyszukiwania - BazTech

1

The synthesis of 2,2-bis(1-indol-3-yl)acenaphthylene-1(2)-ones usingnanocatalysis : fluorescent sensing for Cu2+ ions

Mohammadi Ziarani Ghodsi, Khademi Mahdieh, Mohajer Fatemeh, Badiei Alireza, Varma Rajender S.

Ecological Chemistry and Engineering. S

|

2022

|

Vol. 29, nr 4

463--475

EN

2,2-bis(1H-indol-3-yl)acenaphthylene-1(2H)-ones were synthesised by the reaction of acenaphthenequinone and 2 equivalents of indole using Fe3O4@SiO2@Si-Pr-NH-CH2CH2NH2 as the basic magnetic nanocatalyst, assembled under greener and sustainable conditions in high purity and yields. Furthermore, the photoluminescence properties of 2,2-bis(2-methyl-1H-indol-3-yl)acenaphthylene-1(2H)-one were exploited for the sensing of copper ions in the mixed solvent systems comprising H2O and CH3CN in excitation wavelength at 410 nm with a detection limit of 9.5 ∙ 10–6 M.

2

Kinetics and mechanism of meso-tetraphenylporphyriniron(III) chloride (TPP) catalysed oxidation of indole by sodium perborate

Kungumathilagam D., Karunakaran K.

Polish Journal of Chemical Technology

|

2013

|

Vol. 15, nr 2

107–111

EN

Developing catalyst is very significant for biologically important reactions which yield products, used as drugs. Mechanistic study on meso-tetraphenylporphyriniron(III) chloride (TPP) catalysed oxidation of indole by sodium perborate in aqueous acetic acid medium have been carried out. The reaction follows a fractional order with respect to substrate and catalyst. The order with respect to oxidant was found to be one. Increase in the percentage of acetic acid and increase in the concentration of [H+] decreased the rate. The reaction fails to initiate polymerization, and a radical mechanism is ruled out. Activation and thermodynamic parameters have been computed. A suitable kinetic scheme based on these observations has been proposed. Significant catalytic activity is observed for the reaction system in the presence of TPP.

3

The chemistry and synthesis of 1H-indole-2,3-dione (Isatin) and its derivatives

Sonawane R.P., Tripathi R.R.

International Letters of Chemistry, Physics and Astronomy

|

2013

|

Vol. 7, iss. 1

30--36

EN

Isatins are synthetically versatile substrates, where they can be used for the synthesis of a large variety of heterocyclic compounds. In this, a convenient method has been developed for the conversion of Indoles into Isatins and some heterocyclic derivative were synthesised such as 5- nitro-1H-indole-2,3-dione, 2-methylquinoline-4-carboxylic acid which may be used as raw material for drug synthesis. The general process utilizes the effective method for synthesis of Isatin from Indole is bromination and oxidation with an N-bromosuccinimide-dimethyl sulfoxide reagent. The nitration of Isatin at C-5 takes place by using KNO3, conc. H2SO4, 2-methylquinoline-4-caboxylic acid are usually obtained from pfitzinger reaction.

4

The effect of immobilization in the PVA films on the fluorescence and phosphorescence lifetime of indole and its derivatives

Kowalska-Baron A., Choudhary P., Montes D.

Biotechnology and Food Science

|

2011

|

Vol. 75, nr 2

3-14

EN

This work is devoted to study how immobilization in the PVA films affects the fluorescence and phosphorescence lifetime of indole and its derivatives. The obtained results indicated that immobilization of the studied indoles in the PVA matrix, which leads to the increased microrigidity of the environment around the indole moiety, results in the increase of singlet and triplet excited state lifetime of the studied compounds. Most probably, the enhancement of the rigidity of the environment near the chromophore reduces the rates of the non-radiative deactivation pathways, which leads to the increase of excited state lifetimes of the studied compounds.

5

Magnesium Sulfate as an Efficient and Very Cheap Reagent for the Preparation of Bis(indolyl)methanes

Hasaninejad A., Parhami A., Zare A., Khalafi-Nezhad A., Nasrolahi Shirazi A., Moosavi Zare A. R.

Polish Journal of Chemistry

|

2008

|

Vol. 82, nr 3

565-569

EN

A simple, low cast and efficient solvent-free procedure for the preparation of bis(in -dolyl)methanes via condensation of indoles with aldehydes as well as ketones in the presence of catalytic amount of magnesium sulfate (MgSO4) is described. The reactions proceed rapidly in high yields at 50°C.

6

Samorzutne roztwarzanie miedzi w kwaśnych roztworach chlorków z udziałem beznzotriazolu lub indolu

Scendo M.

Ochrona przed Korozją

|

2005

|

nr 12

382-387

PL

Badano wpływ stężenia benzotriazolu (BTA) lub indolu (IN) oraz pH na samorzutne roztwarzanie miedzi w kwaśnych roztworach chlorków, które zawierały tlen. Stwierdzono, że mechanizm inhibicji polega na utworzeniu polimerycznej, trudno rozpuszczalnej warstwy ochronnej. BTA i IN adsorbują się na powierzchni miedzi wg izotermy Langmuira. Wydajność (skuteczność) inhibitowania (IE) wzrasta w miarę wzrostu stężenia obu inhibitorów. BTA i IN najbardziej skutecznie inhibitują korozję miedzi w roztworach, których pH wynosi odpowiednio 3,0 i 1,0.

EN

The influence of pH and concentration of benzotriazole (BTA) or indole (IN) on the spontaneous dissolution of copper in acidic chloride solutions containing oxygen has been studied. The mechanism of inhibition consists in forming a polymeric highly dissoluble protective layer. The adsorption of BTA and IN has been found to occur on the surface of copper according to the Langmuir isotherm. The effi ciency of the inhibition (IE) of the spontaneous copper dissolution regularly increases with the rise in the concentration of both inhibitors. BTA and IN inhibit the corrosion of copper most effi ciently in solutions whose pH are 3.0 and 1.0 respectively.

7

ESI-ion trap multistage and MALDI-TOF mass spectrometry study of protonated per-O-acetyl indole glucosides

Bekesova S., Cmelik R., Humenik M., Kutschy P., Kovacik V.

Chemia Analityczna

|

2005

|

Vol. 50, No. 1

223-233

EN

Structure of the title compounds -synthetic precursors of phytoalexin analogs- includes per-O-acetylated D-glucose and N-pheny! substituted indole carboxamide or carbothioamide moieties. Fragmentation mechanisms of these compounds have been studied by electrospray (ESI) ion trap (IT) multistage (MSn=1-5) mass spectrometry and matrix assisted laser desorption/ionization time-of-flight (M ALDT-TOF) techniques. In the primary ionization process, per-O-acetylated indole glucoside cationized (H. Na and K) adducts have been observed. Three fragmentation pathways of the protonated molecules are described. Two of the routes are dominated by the cleavage of the saccharidic part, while in the third one the cleavage of aglycons is a predominant process. Fragmentation of the carbonyl group differs from that of the thiocarbonyl analog. The influence of electron-donating or electron-accepting groups of the aromatic ring on the fragmentation pathways is also discussed. The presented theoretical data on the ESI and MALDI behavior of the saccharidic as well as of the indole and phenyl aglycon parts can facilitate structure elucidation of the analogous compounds.

PL

Elementami struktury tytułowych glukozydów - syntetycznych prekursorów analogów • fitoaleksyny - są N-fenylo podstawione karhoksoamidy lub karbotioamidy indolu i per-O-acelylowana D-glukoza. Fragmentację tych związków badano stosując wielostopniowa (MSn, n= 1-5) spektrometrię mas z jonizacją przez elektro rozpylanie oraz spektrometrię mas czasu przelotu z jonizacją przez desorpcję laserową z udziałem matrycy. W pierwszym procesie jonizacji obserwowano kationowane (H, Na, K) addukty glukozydu per-O-acetyl indolu. Opisano trzy drogi frakcjonowania protonowanych cząsteczek. Dwie z nich są zdominowane przez rozszczepienie części sacharydowej. w trzeciej dominuje rozszczepienie części aglikonowej. Fragmentacja grup karbony Iowy cli różni się od fragmenlac j i analogów tiokarbonylowych. Przedyskutowano wpływ grup elektrono-donorowych i elek-trono-akceptorowych w pierścieniu aromatycznym na drogi fragmentacji. Przedstawione teoretyczne dane, dotyczące zachowania się w ESI i MALDI części sacharydowej i części aglikonu indolowego i fenylowego, ułatwiają wyjaśnienie struktury analogicznych związków.