A general and efficient protocol for direct C–H alkylation acylation of N-heterocycles, using readily accessible carboxylic acids as radical precursors under visible-light irradiation without a photocatalyst an additional acid additive, has been developed. This provides expedient access to substituted N-heterocycles mild metal-free conditions. Mechanistic experiments indicate that this reaction proceeds through visible-light-initiated chain propagation mechanism.

The transformations of cyclopropenes have attracted the attention organic chemists for decades. As readily accessible strained carbocycles, show a diverse range reactivities. This feature article focuses on developments from 2016 until end 2019, including reactions through vinylmetal carbenes, metal complex insertion, addition with 1,3-dipole, radical cyclopropenes, and highly reactive in situ generated cyclopropenes. In addition, several new synthetic methods applications are also disclosed...

These current results show that the use of Co( ii )-MOF chemistry, especially in presence various auxiliary linkers, is an efficient method to prepare multifunctional MOFs combining new outstanding structures and excellent properties.

Dye-sensitized solar cells (DSSCs) with cobalt electrolytes have gained increasing attention. In this Research Article, two new pyrido[3,4-b]pyrazine-based sensitizers different cores of bulky donors (indoline for DT-1 and triphenylamine DT-2) were designed synthesized a comparative study their photophysical electrochemical properties device performance also analyzed through density functional theory calculations. The results function calculations reveal the limited electronic communication...

The nature of defects and organic ligands can fine-tune the absorption energy (Eabs) metal-organic frameworks (MOFs), which is crucial for photocatalytic reactions; however, relevant studies are in their infancy. Herein, a series typical MOFs UiO family (UiO-6x-NH2, x = 8, 7, 6) with varied lengths amino-group-modified were synthesized employed to explore performance CO2 reduction. Sample UiO-66-NH2-2ABA (2ABA 3,5-diamino-benzoate) shortest dicarboxylate ligand two exhibits superior activity...

Deoxygenative cross-coupling between unactivated C–O and unsaturated C═O electrophiles remains an unsolved challenge in synthetic chemistry. Here, we report the deoxygenative of C–O/C═O by reaction aryl esters with amides, enabled chromium catalysis. Inexpensive simple CrCl3 salt combined bipyridine ligand, magnesium reductant, chlorosilane, shows high reactivity promoting coupling bonds involving hydrogen transfer. This provides a strategy to form pharmaceutically interesting...

Four new Ni( ii ) coordination polymers (1–4) have been successfully synthesized using 5,5′-(ethene-1,2-diyl)diisophthalic acid (H 4 L) and different N-donor ancillary ligands. Furthermore, the magnetic properties of 1–4 were investigated in detail.

Pd-catalyzed cross-coupling of furfural tosylhydrazones with aryl halides produces 2-furylmethylenepalladium halides, which can undergo intramolecular nucleophilic dearomatization to provide spiroacetal enol ethers. This is the first report on formation from stable hydrazones instead 2-furylmethyl are not readily accessible or unstable.

Geminal cross couplings using multiple components enable the formation of several different bonds at one site in building tertiary and quaternary alkanes. Nevertheless, there are remaining issues concern-cleavage two geminal control selectivity present challenges. We report here three by reactions dihaloalkanes with organomagnesium chlorosilanes or alkyl tosylates Cr catalysis, affording C-C/C-Si C-C/C-C creation The catalyzed low-cost CrCl2 , enabling sluggishness competitive Kumada-type...

Three new Co( ii ) coordination polymers (1–3) have been successfully synthesized. 1 and 3 display a 3D framework with (4,6)-connected CrB-type topology, 2 displays 1D chain. 1–3 all antiferromagnetic interactions in the unit.

Metal-organic frameworks (MOFs), recognized as advanced catalyst carriers due to their adjustable porous, diverse structure and highly exposed active sites, have earned increasing attention for potential address the longevity of catalytic centers. In this manuscript, we devised synthesized a multifunctional amino-pyridine benzoic acid (APBA) ligand replace modulator MOF-808 disperse palladium centers atomically on MOF-APBA. The resulting single-site system, Pd@MOF-APBA, demonstrates...

Abstract Based on our previous studies, the scope of transformation 2‐furylcarbinols into spirofurooxindoles, and also skeletal rearrangements spiro[furo‐oxindoles] spiro[thieno‐oxindoles] were studied. The thermally rearranged spiro[pentenone‐oxindoles] by a mechanism involving conrotatory electrocyclization 4π‐electron system. free energy step was calculated to interpret stereochemical outcomes. In contrast, under acidic conditions thieno[2,3‐ c ]quinolin‐4‐ones, an interesting...

Abstract Four novel metal–organic frameworks constructed from benzimidazole flexible tetracarboxylic acid ligand, 1‐(3,5‐dicarboxylbenzyl)‐1H‐benzimidazole‐5,6‐dicarboxylic (H 4 L), have been prepared by a solvothermal method in the presence of N‐donor ancillary ligands (1,10‐phen = 1,10‐phenanthroline monohydrate, 4,4′‐bibp 1,4‐di[pyridine‐4‐yl]benzene), namely, [Co 2 (L)(H O) 3 ] n (1) , {[Cd (L)(1,10‐phen)(H O)]·2H O} (2) {[Co (L) (4,4′‐bibp) 7 ]·4H (3) and {[Ni (4) . Complexes 1 show 3D...

A ring-opening/cyclization cascade reaction of α-brominated amide-tethered alkylidenecyclopropanes in the presence photocatalyst 4CzIPN under visible-light irradiation was developed to afford polycyclic benzazepine derivatives good yields with broad substrate scope and functional tolerance. plausible mechanism involving a halogen atom transfer (XAT) process radical chain is proposed for this reaction. This study provides concise practical strategy synthesis derivatives.

Under the promotion of Cu(II) salts, α-thienylcarbinols with an N-phenyl carbonyl group at other α-position are converted into three different ranges spirothienooxindoles involving dearomatizing Friedel–Crafts reaction. In addition, unprecedented regioselective CuX2-mediated C–H functionalization/halogenation dienyl sulfether containing electron-rich aryl rings is presented.

A visible-light-mediated decarboxylative tandem carbocyclization of acrylamide-tethered alkylidenecyclopropanes with phenyliodine(III) diacetate and various aliphatic acids has been reported in this paper. An alkyl radical situ generated from dicarboxylates upon visible-light irradiation catalyzed by fac-Ir(ppy)3 adds to the less hindered central carbon alkylidenecyclopropane initiate annulation, generating tetracyclic benzazepine derivatives moderate good yields broad substrate scope under...

Seven new metal–organic frameworks (MOFs), namely, [Zn 2 ( L 1 )(H O) 3 ] n ), )(dib)(H {[Zn )(4,4′-bipy)(H ]·H O} [Cd )(1,10-phen)] 4 [Ni (H )(4,4′-bipy)(μ -OH)(μ -H O)] 5 {[Co )(4,4′-bibp) ]·(4,4′-bibp) } 6 and [Co 7 where H are semi-rigid 3-(3,5-dicarboxylphenoxy)phthalic acid 4-(3,5-dicarboxylphenoxy)phthalic acid, respectively, 4,4′-bipy is 4,4′-bipyridine, dib 1,4-bis(1 -imidazol-1-yl)benzene, 1,10-phen 1,10-phenanthroline 4,4′-bipb 1,4-bis(pyridin-4-yl)benzene, have been prepared...

A Cu(I)-catalyzed coupling and cycloisomerization of diazo compounds with terminal yne-alkylidenecyclopropanes (ACPs) has been presented. This reaction starts from the formation an allenic intermediate in cross-coupling a compound alkyne yne-tethered ACP then undergoes domino 6π-electrocyclization cyclopropane ring-opening rearrangement to give functionalized cyclopenta[b]naphthalene derivatives moderate excellent yields under mild conditions.