ABSTRACT The hydrolysis of poly(ethylene terephthalate) (PET) obtained from waste bottles was studied. dual functional phase transfer catalyst [(CH 3 ) N(C 16 H 33 )] [PW 12 O 40 ] exhibited outstanding catalytic activity to the PET. Fourier transform infrared spectroscopy and proton nuclear magnetic resonance were used confirm main product terephthalic acid (TPA) hydrolysis. effects temperature, time, particle size PET dosage on reaction examined. Under optimum conditions temperature 145°C,...

ABSTRACT Betel nut possesses a distinctive flavour that appeals to specific consumers, despite the well‐documented risks of oral diseases associated with its use. Understanding characteristic aroma betel is essential for developing appealing substitutes. In this study, supercritical CO 2 fluid extraction was employed obtain extracts from green and black nuts, volatile compounds were analysed using headspace solid‐phase microextraction. A total 30 identified in nuts 37 nuts. Through odour...

A new chemodosimeter for cyanide ions based on dual deprotonation of NH and CH groups was developed the first time, with high selectivity, dramatic red-shifted absorption (≈263 nm) fluorescent “turn-on” detection.

A simple and efficient synthetic approach is reported for the synthesis of highly functionalized 4‐amino‐iminocoumarins 4 4‐aminoquinolines 6 in moderate to excellent yields, through a copper‐catalyzed multicomponent reaction. The reaction carried out one‐pot manner, using readily available terminal alkynes 1 , sulfonyl azides 2 2‐hydroxybenzonitriles 3 or 2‐aminobenzonitrile ( 5 ) as substrates at slightly elevated temperature under N . protocol operationally has good substrate scope....

Abstract A facile, one‐step, direct functionalization of the C1 and N positions tetrahydroisoquinolines was developed. Unprotected tetrahydroisoquinolines, indoles, benzaldehydes could be used as starting materials. The different substituted indoles were investigated in detail scope proved to broad.

Abstract A copper‐catalyzed one‐pot approach to α‐aryl amidines from terminal alkynes, sulfonyl azides, and aryl sulfonamides via a Truce‐Smiles rearrangement under mild condition in good excellent yields was reported for the first time. The formation of such aryl‐ sp 3 C−C bond previously could not be directly achieved by common method. stoichiometry substrates played an important role improving desired products. In addition, two sets signals were observed 1 H NMR spectra their possible...

A terminal alkyne-assisted protocol for the one-pot formation of a diverse range arylamidines from novel cascade reaction in situ generated nitrile oxides, sulfonyl azides, alkynes, and water by [3 + 2] cycloaddition ring opening sequence was developed. The use aryl oxime chlorides as carbon source amidine group addition proved to be critical reaction. Moreover, which can lead high yields products employing less amount, may play catalytic role broader substrates investigated.

Abstract We developed a new chromogenic and fluorescent ‘turn‐on’ chemodosimeter 1 based on F – ‐triggered cascade reaction. This system displayed significant changes in UV/vis absorption fluorescence emission intensities selectively for over other anions mixture of CH 3 CN/H 2 O (95 : 5, v/v) acetonitrile. Copyright © 2014 John Wiley & Sons, Ltd.

The synthetic methods of alkaline ionic liquid hydroxide 1-butyl-4-dimethy1 aminopyridine were optimized by using orthogonal experimental.By triethylene diamine (DABCO) as catalyst and solvent, aromatic aldehydes with methyl acrylate's Baylis-Hillman reaction was studied.Experimental results showed that fast rate high yield obtained in the presence liquid.On this basis, under influence water-ionic composite system further studied, better result.

The efficient and recyclable system, DMAP-based ionic liquid/water, has been developed used in the Morita– Baylis–Hillman reaction of aromatic aldehydes with acrylates. coupling reactions under described basic conditions proceed quickly good to excellent yields. liquid could be reused at least five times without significant loss activity.

A new, step-economical and operationally simple access to unsubstituted 1,2-dihydroisoquinolin-3(4<italic>H</italic>)-imines by Cu-catalyzed MCRs under mild conditions is described.

A facile method for the regioselective Friedel–Crafts acylation of indoles with acyl chlorides catalysed by zinc oxide in an ionic liquid medium has been developed. The corresponding 3-acylindoles were obtained good to high yields under mild reaction conditions. Zinc oxide, which is easily available and requires no special handling procedures, efficient catalyst indoles.

Essential oils from flesh fingered citrons were obtained by mechanical pressing extraction under optimal conditions. Thirty-three components, representing 78.25% of the total oil, identified gas chromatography-mass spectrometry (GC-MS). In this study, we explored toxicity essential oil and associated regulatory mechanism using Caenorhabditis elegans as a model organism. The mortality experiment showed that LD 50 value is 1.48 mg/ml. Oxidative stress experiments can reduce antioxidation...

Abstract A facile approach to a rare class of 3,3‐disubstituted 2‐iminoimidazo[1,2‐ ]‐pyridines bearing hydroxyl group at the 3 position in good excellent yields from N ‐(2‐pyridyl)amidines substrates presence CuI/I 2 /KI/KO t Bu is described. According investigation, use Cu catalyst and sulfonyl groups has remarkable influence on success oxidative cyclization reaction. Moreover, oxygen source may be incorporation water reaction system or KO Bu. The successful implementation further...

Flesh fingered citron (FFC) essential oil (EO) is susceptible to volatilisation at room temperature. Therefore, its use as a nematicide requires controlled release. In the present study, we encapsulated FFC EO in β -cyclodextrin by embedding and investigated release from capsules compared unembedded EO. We evaluated structural thermal properties of SEM TGA. The loading capacity was 32.67%, yield 96.24%, assuming that core-to-wall quality ratio 1 : 6 optimal for carrier. Using Caenorhabditis...

Development of colorimetric and fluorescent probes capable selectively detecting H 2 S has emerged as attractive tools to understand the roles in various physiological processes food safety. Here, we show a facile efficient strategy that involves introducing quinolinium-phenol vinylic conjugate QLS probe, based on principle S-triggered release protected group ( PG ). The synthesized probe can efficiently monitor identify trace amounts with highly selectivity, sensitivity Naked-eyed detection...

Abstract Heterocycles with tetrahydroisoquinolines moiety are important biologically, and α‐aminophosphonates derivatives have unusual features in agrochemicals medicines. In this paper, we combined these two parts to afford tetrahydroisoquinolines. A highly facile, one step direct carbon‐phosphor bond formation N‐alkylation of was developed. It is a three‐component reaction Nitrogen‐unprotected tetrahydroisoquinolines, aldehydes trialkyl phosphites, which provides C1‐phosphonylated N...

A facile, efficient and environment-friendly protocol for the regioselective synthesis of 3-acyl indoles has been developed by one-pot catalytic Friedel-Crafts acylation indole in presence iron powder as catalyst under solvent-free conditions at room temperature.

Abstract Novel heterocyclic enamine derivatives based on skeleton of neonicotinoids were designed and prepared by the substitution reaction between enamines with intermediates neonicotinoids, which provides readily accessible neonicotinoid analogs for potential bioactivity assay.

from 1,2-diketones and ethylenediamine

Abstract Unsubstituted tetrahydroisoquinoline (I) is treated with various benzaldehydes or cyclohexanealdehyde and indoles under conditions A) which include an optimized catalytic system consisting of 3 components.