A metal-free organic dye-sensitized solar cell attains 13% power conversion efficiency under AM1.5G full sunlight.

A metal-free perylene dye achieves a PCE of 10.4% at the AM1.5G conditions as well-known zinc porphyrin <bold>YD2-o-C8</bold>.

The NaOAc-assisted aerobic oxidation reaction of pentacoordinate hydrospirophosphoranes and dichalcogenyl compounds with open air as a green oxidant has been developed under mild conditions. A series novel spirophosphoranes P–Se/P–S bonds were synthesized in excellent yields. mechanism was determined by 31P nuclear magnetic resonance tracing experiments, high-resolution mass spectrometry X-ray diffraction analysis. method features broad substrate scope, good functional group tolerance, high...

We scrutinize the effects of ancillary electron-donors on light absorption and charge recombination in phenanthrocarbazole dye-sensitized solar cells.

The Atherton-Todd-type reaction of pentacoordinate hydrospirophosphoranes with amines was investigated, and a novel CO2 insertion into the P-N bond under mild conditions developed. mechanism stereochemistry between secondary were proposed via carbon-13 labeling experiment, (31)P NMR tracing X-ray diffraction analysis. chlorinated spirophosphorane intermediate first generated stereoretention configuration at phosphorus subsequently attacked by carbamate anion formed from amine. It found that...

A catalyst free Friedel–Crafts (F–C) hydroxyalkylation of imidazo[1,2-α]pyridines with ethyl trifluoropyruvate is herein described using isopropyl ether as a solvent.

Abstract The fragmentation pathways of deprotonated cyclic dipeptides have been studied by electrospray ionization multi‐stage mass spectrometry (ESI‐MS n ) in negative mode. results showed that the depended significantly on different substituents, side chains amino acid residues at diketopiperazine ring. In spectra dipeptides, ion [MHsubstituent radical] − was firstly observed ESI characteristic fragment ions and [MH(substituentH)] could be used as symbols particular dipeptides....

Cyclic dipeptides are relatively simple compounds that can exhibit a great variety of important biological activities. The fragmentation pathways protonated cyclic have been studied by electrospray ionization multistage mass spectrometry (ESI-MS n ). spectra studies the showed with similar substituents, side chains amino acid residues at diketopiperazine ring, followed same pathway. In dipeptides, some characteristic fragment ions were observed and could be used to distinguish dipeptides....

An efficient I 2 (10 mmol%)/H O mediated oxidative formal [4+1] cyclization of 2-pyridinemethylamine or o-phenylenediamine (2-aminobenzenethiol) with benzaldehyde via C-N bond formation has been developed. This strategy offers a straightforward approach to imidazo[1,5-a]pyridine and benzimidazole (benzothiazole) derivatives in 65% 98% yields. Several heterocyclic products exhibit promising blue luminous performance satisfactory fluorescence quantum yields up 64%, large Stokes shifts, longer...

An investigation of the impact N-position, H-bond and π-stacking for fluorescence in imidazopyridine benzimidazole derivatives.

Sartans and related analogues with 5‐oxo‐l, 2, 4‐oxadiazole ring tetrazole are investigated in detail using collision‐induced dissociation (CID) method positive ion mode by electrospray ionization tandem mass spectrometry (ESI‐MS n ). It is found that the protonated sartans tend to form N‐substituted‐3‐substituted phenanthridin‐6‐amine which has a large conjugative structure. The possible fragmentation pathways were proposed for first time, key structure of product ions was confirmed high...

The stereochemical mechanism of the nucleophilic substitution reaction at pentacoordinate phosphorus (P–V) atom is rarely studied. Here, we report Atherton-Todd-type hydrospirophosphorane with phenolic compounds in detail. P–V was proposed by 31P NMR tracing experiment, X-ray diffraction analysis, and density functional theory calculations. first step formation halogenated spirophosphorane intermediate retention configuration definitely. second a spirophosphorane. When using CCl4 as...

ABSTRACT The Atherton–Todd‐type reaction of hydrospirophosphoranes (HSPs) and sodium alcoholates was investigated. Direct alkoxylation HSPs accomplished with in acetonitrile under nitrogen atmosphere. stereochemistry mechanism the alkoxidation proposed by 31 P NMR tracing experiment. proceeded via chlorinated spirophosphorane intermediate stereoretention configuration at phosphorus, followed rear front attack alkoxide anions to produce alkoxy spirophosphoranes. well explained results alcoholates.

Abstract Fragmentation pathways of a series pentacoordinated bisaminoacylspirophosphoranes were elucidated by electrospray ionization multistage mass spectrometry (ESI‐MS n ) in negative mode. The deprotonated ions tend to eliminate corresponding amino acid form base peak. hydrogen/deuterium exchange experiment, the high‐resolution spectrometry, 13 C stable isotope labeling experiment and theoretical calculations used rationalize proposed fragmentation verify differences between pathways....

The phosphorus-carbon coupling constant 3JCCNP was found to be sensitive the relative configuration of pentacoordinate spirophosphorane diastereoisomers, while 2JCNP value remained almost unchanged. with ΛP at phosphorus obviously larger than that ΔP configuration. rule, (ΛP) > (ΔP), for diastereoisomers used assign configurations new alkoxy derivatives, and satisfactory results were achieved. showed might as a reliable probe derivatives.

The classical Atherton–Todd reaction has been successfully applied to the synthesis of pentacoordinate pyrospirophosphoranes containing a P-O-P bond under mild conditions. absolute configurations products were confirmed by X-ray diffraction analysis and spectroscopic identification. And 31P NMR chemical shifts correlated with stereochemistry. A possible mechanism for explaining stereochemistry was proposed, it could well explain results reactions different hydrospirophosphoranes.

Abstract Hydrogen peroxide, a cheap and easily available green oxidant, can not only produce oxygen, but also hydroxyl radical by homogenization under the catalysis of metal. Toluene benzyl halide be oxidized to benzaldehyde hydrogen peroxide participate in reaction with 2‐aminobenzylamine. Through construction C−N bond, series quinazoline derivatives were synthesized. This allows broad range substrates as well good functional group compatibility.

Comprehensive Summary A CuX‐mediated regioselective halogenation reaction of 2‐phenylimidazo[1,2‐ a ]pyridine in the presence oxygen is introduced this paper. This provides an effective method for production C‐3 halogenated ]pyridines with yield up to 96%. plausible mechanism formation title compounds via ]pyridine–CuX complex intermediate proposed. The structure representative established by single crystal XRD method. electronic structure, corroborated Hirshfeld surface analysis and DFT...

Pentacoordinated bisaminoacyl hydrospirophosphoranes were first found to induce the asymmetric addition reactions as a novel chiral organic framework. Asymmetric of with aromatic aldehyde and in situ generated imine investigated, corresponding α-hydroxyspirophosphonates α-amino spirophosphonates obtained. The reaction ΔP configuration showed better stereoselectivity than that ΛP configuration, not only for but also imine. Furthermore, stereochemical mechanisms induced by pentacoordinated...