Easily oxidized group of traditional phenolic resin (PF) results in poor oxidation resistance at high temperature, which is unable to satisfy the requirements of advanced aerospace vehicles for high-performance application, especially ablation resistance. In order to improve the oxidation resist...

A novel method based on surface-enhanced Raman scattering (SERS) was developed to estimate the reducing capacity of phenolic acids by using self-assembled three-dimensionally (3D) ordered gold nanoparticles (GNPs) precursor composite (SiO2/GNPs) arrays as nanoprobes. In the present work, the 3D ...

We demonstrate a novel recyclable enzymatic approach of extraction of pectin and punicalagin rich phenolics from the waste pomegranate peels (WPP) using the magnetic nanobiocatalyst technology. First, the cellulase was cross-linked with the iron oxide magnetic nanoparticles using glutaraldehyde ...

The direct hydroxylation of benzene to phenol under H2O2 is one of the most important research topics in catalytic synthesis and green chemistry. As a conventional and widely available catalyst, vanadyl (IV) acetylacetonate [VO(acac)2] shows remarkable catalytic efficiency for the process, howev...

We report the first use of a paper-based device as a simple, low-cost and rapid detection platform for simultaneous determination of antioxidant activity and total phenolic content in food samples. Two antioxidant activity assays including 2,2′-azino-bis(3-ethylbenzthiazoline-6-sulphonate) radi...

In this study, the synthesis of Fe3O4@[email protected]3N4 ternary nanocomposite for enhanced photocatalytic degradation of phenol has been investigated. The surface modification of Fe3O4 was performed through layer-by-layer electrostatic deposition meanwhile the heterojunction structure of tern...

In this work, polymerizable (4-vinylbenzoyl)-l-tryptophan (VBLT) was synthesized and characterized utilizing, elemental analysis, mass spectra, FTIR, 1H and 13C NMR. VBLT was then copolymerized with styrene and divinylbenzene cross-linker using potassium persulfate free radical initiator. The te...

Poly(styrene) is immiscible with poly(ethyl methacrylate). The introduction of a small amount of 4-vinylbenzoic acid units along poly(styrene) chains (PS–VBA) enhanced its miscibility with poly(ethyl methacrylate) (PEMA) or with poly[ethyl methacrylate–co-(2-N,N-dimethylaminoethyl) methacrylat...

In this study, a new stir cake sorptive extraction (SCSE) based on poly(4-vinylbenzoic acid-divinylbenzene) (VBADB) monolith was prepared. The effect of preparation conditions of monolith on extraction efficiencies was investigated in detail. Several characteristic techniques, such as elemental ...

Nine active ester monomers based on 4-vinylbenzoic acid have been synthesized. Under free radical polymerization conditions these monomers could successfully be polymerized yielding reactive polymers with molecular weights of around Mn = 20.000–50.000 g/mol and molecular weight distributions Mw...

The crystal structure of 4-vinylbenzoic acid has been determined at 363 K. By comparison with the molecular structure at low temperature (108 K), this structure has a vinyl group oriented in the opposite direction as a minor part of a disordered structure. Since the disorder disappears at low te...

The deprotection of 1,3-dibenzyl-5-(N,N-dimethylamino)-6-phenyl-ethyluracil I was investigated. A practical, regioselective N3 deprotection of compound I was performed with excellent yield using cyclohexene as a hydrogen donor.

tert-Butylation of toluene with tert-butanol in the liquid phase was studied over large pore mordenite zeolite catalyst (H-MOR CBV 21A with Si/Al = 10.5) and over cerium-modified parent zeolite with 1–6 wt.% of cerium. The catalytic activity and para-selectivity of parent and cerium-modified H-...

An Hβ-supported heteropoly acid (H3PW12O40 (HPW)/Hβ) catalyst was successfully prepared by wetness impregnation, and investigated in the alkylation of toluene with tert-butyl alcohol for the synthesis of 4-tert-butyltoluene (PTBT). X-ray diffraction, scanning electron microscopy, transmission ...

A series of Ti-Al-M48 (M48 stand for MCM-48) samples with different titanium species loadings were prepared by immobilization method. Their physical chemical properties were characterized by XRD, liquid N2 adsorption-desorption, Py-IR, NH3-TPD and UV–vis DRS techniques, and their catalytic perf...

Monometallic cobalt and manganese, and their bimetal-supported hexagonal mesoporous silicas (HMS) prepared by incipient-wetness impregnation using cobalt nitrate and manganese acetate as precursors, and ethanol and ethylene glycol as impregnation solvents, respectively, were examined as catalyst...

An enantiospecific synthesis of both L(−)- and D(+)-6-chloro-5-hydroxytryptophan 1a and important derivatives 1b and 1c was achieved in five steps from 6-chloro-5-methoxy-3-methylindole 2.

A series of fluorinated fullerene-fused 1,3-dioxolanes have been facilely and efficiently synthesized in the presence of easily available LiClO4·3H2O. The influences of the number of fluoro-substituents and their positions linked to the phenyl ring on the isolated yield of fullerene-fused 1,3-d...

A thiocoumarin dye, Probe 1, has been developed for the detection of hypochlorite anion (ClO−) via the desulfurization of thiocoumarin. The heavy atom effect efficiently quenched the fluorescence of Probe 1. Upon the addition of ClO−, Probe 1 was instantaneously oxidized into its oxo form, resul...

The palladium-catalyzed, copper-promoted cross-dehydrogenative-coupling (CDC) of electron-deficient thiazoles with azine N-oxides through dual C–H activations was developed. It was found that copper(II) pivalate was an efficient dual-function reagent for the oxidative cross-coupling reactions, ...