A metal-free system for regioselective dehydrogenative cross-couplings between indolizines and oxoaldehydes catalyzed by visible light under mild conditions has been described. As an atom economical eco-friendly protocol, the reaction proceeds in good yields using inexpensive, readily available visible-light sources environmentally friendly oxidant oxygen. Various valuable 1,2-dicarbonyl derivatives attached to indolizine core were easily accessed direct dicarbonylation of sp2 C–H bond.

By utilizing the dual reactivity function of N -aminopyridinium ylides, we developed a direct [3 + 2]-cycloaddition ylides and ynals to build pyrazolo[1,5- ]pyridine core while introducing cyano group.

Pyridinium 1,4-zwitterionic thiolates were regarded as powerful and versatile building blocks to prepare nitrogen- sulfur-containing heterocycles. Herein, we reported a copper-catalyzed formal [4 + 1] annulation of pyridinium diazo compounds without any additives access library trifunctionalized indolizines in good yields. Besides, isoquinolinium imidazolium also applied this reaction. Of particular note is that various functional groups such -CO2R, -CO2NR2, -CF3, -CN, -(O)P(OR)2 could be...

A maximum fluorescence enhancement of 11 times was achieved by surface plasmon polaritons (SPPs) on a silver nanohole array region in reflection mode, compared to that the nonarray area. 30 nm dielectric SiO2 film sputtered as spacer separate fluorophore from for attenuation quenching. An period 550 and radius 100 were optimized match most efficient excitation emission boron-dipyrromethene (BODIPY 630/650) region.

This work reports effective activated multiple layers Ag-TiO2 films and Ag-TiO2/Ag via a solgel direct coating approach. Scanning electron microscopy transmission electronic microscope are performed to characterize the morphology. The roles of metallic Ag on TiO2 for photodegradation stearic acid explained by UV–vis spectroscopy photoluminescence spectroscopy. photocatalytic activity decomposition is 5 times higher than that pure films. Different have almost same acid. strong surface plasmon...

The enhanced optical transmission (EOT) and the fluorescence emission (EFE) of metallic nanohole arrays have been widely studied. Here, dielectric thickness detection sensor based on these two aspects has investigated by changing SiO2 layer deposited metal surface. We demonstrated that Wood anomaly dip in EOT is better for than SPP peak. Moreover, EFE, measuring change intensity with layer, we obtained higher thickness-detection sensitivity. These results indicate potential application biosensors.

A novel and straightforward strategy for the synthesis of functionalized thiazoles from thioamides, ynals, alcohols via a copper(I)-catalyzed three-component reaction has been described. Through formation new C–S, C–N, C–O bonds in one pot, it is easy to produce various valuable fixed with aryl or heteroaryl groups. In addition, also exhibits other unique advantages, such as high step economics, good functional group tolerance, regioselectivity.

A novel one pot, metal-free, three-component domino reaction for the formation of furan derivatives has been developed from 3-phenylpropiolaldehyde, 1,3-dicarbonyl compounds and aromatic amine or aliphatic acid.

Our recently developed multiple transmission−reflection infrared (MTR-IR) spectroscopy method was applied to measure arachidic acid Langmuir−Blodgett films on hydrophilic and hydrophobic silicon substrates. High-quality MTR-IR spectra at both s p polarizations were obtained. The absorption intensity different incident angles found be linearly correlated with the transmission times (N) for monolayers a substrate. Significant differences in polarization-dependent intensities observed some...

Abstract We constructed multiple generation nitriloacetates from poly(poly(ethylene glycol)monomethacrylate) brushes on a planar silicon surface (Si‐ g ‐P(PEGMA)) to improve the capacity of binding proteins and biofouling repellence. Firstly freshly etched Si(111)H reacted with 10‐undecen‐1‐ol under an optimized microwave irradiation condition produce hydroxyl‐terminated substrates. Secondly initiators for atom transfer radical polymerization were introduced by means esterification between...

A convenient and new copper nanoparticles-catalyzed cross-coupling reaction of imidazo[1,2-a]pyridines with methyl ketones has been developed to synthesize 1,2-diketones that have an imidazo[1,2-a]pyridine core. Highly active magnetic nanoparticles [i.e., Cu4O3@Fe3O4_C(II)] were prepared characterized by standard materials characterization techniques, which included transmission electron microscopy, scanning X-ray photoelectron spectroscopy (XPS) diffraction. These methods also used acquire...

Abstract A novel approach for the synthesis of C1 and C3‐dialkoxy indoles has been developed using 2‐(phenylethynyl)aniline with formaldehyde alcohols under catalysis acid palladium acetate. This multicomponent reaction that provides a straightforward alkoxymethylation process to construct substituted is expected be an important method indole derivatives.

An efficient copper-catalyzed strategy for the synthesis of α-ketoamides via cross-coupling methyl ketones and pyridin-2-amines is described. This transformation has provided a simple process formation C−N C=O bonds to prepare α-ketoamides, which are important substrates intermediates preparation fine chemicals. The reaction mechanism investigated, suggests that proceeds radical pathway.

We have proposed a new theoretical method for measuring the Brillouin gain of liquids by analyzing pulse compression ratio that pump duration to output Stokes duration. The model is presented based on coupled wave equations. coefficient can be determined ratio, intensity and characteristic length. application measurement SBS in some Newtonian will subject further studies.

Abstract The products are not obtained when aniline or piperidine is used as starting material.