Recent progress on the use of iron and cobalt complex pre-catalysts for ethylene reactivity is reviewed. The review organized in terms denticity chelate ligands employed, with particular reference to influence ligand frameworks their substituents catalytic performance oligomerization/polymerization catalysis. majority systems bear tri-dentate ligation at iron/cobalt centre, though it clear that bi-dentate have also attracted significant attention. Such produce most cases highly linear...

An oxidative homo dimerization of N-protected and free indole derivatives toward bioactive 3,3′-linked biindolyl scaffolds via Pd-catalyzed direct C–H transformations was first successfully demonstrated.

A palladium-catalyzed annulative π-extension reaction of bay-iodinated triphenylenes with aryl iodides/o-chloroaromatic carboxylic acids was developed. This approach enabled the synthesis diverse polycyclic aromatic compounds, including dibenzo[fg,op]tetracenes, azadibenzo[fg,op]tetracenes, and tribenzo[a,g,m]coronenes. Initial studies indicate that resulting product, 2,3,8,9,14,15-hexakis(decyloxy)tribenzo[a,g,m]coronene, exhibits good liquid-crystalline properties.

Abstract A copper‐catalyzed amination of aryl halides with nitriles has been developed. The use as nitrogen nucleophiles can make the synthesis N ‐arylamides more simple than that using amides through in‐situ hydrolysis. variety and benzoxazole derivatives be synthesized according to this approach.

The synthesis of benzimidazoles by intermolecular cyclization reaction 2-iodoanilines with nitriles has been developed. These reactions proceeded without the aid any transition metals or ligands and just using KOBut as base. A variety substituted benzimidazole derivatives can be synthesized approach.

Summary of main observation and conclusion The radical‐initiated carboxylative cyclization allylamines with CO 2 represents an efficient highly promising strategy to afford valuable 2‐oxazolidinones. However, the radical precursors pathways generate radicals in such processes are still limited. Herein, we report first Cu‐catalyzed selective oxy‐cyanoalkylation cycloketone oxime esters via C—C bond cleavage. Many cyanoalkyl‐substituted 2‐oxazolidinones obtained moderate good yields high...

An efficient one-pot synthetic procedure was developed for the direct preparation of polysubstituted triphenylene 2,3-dicarboxylic esters <italic>via</italic> a tandem addition process from diarylacetylene.

Abstract A para ‐selective CH amidation of simple arenes with nitriles has been developed. By increasing the amount arenes, a further meta arylation produced amides occurred. Both steric and electronic effects are utilized to control selectivity, resulting in only products. The readily available as reagents instead makes synthesis N ‐arylamides more accessible. magnified image

Abstract A palladium‐catalyzed two‐fold annulation reaction of 2,6‐dihalogenobiphenyls with o ‐chloroaromatic carboxylic acids has been developed. This method enables the synthesis various dibenzo[ fg,op ]tetracenes and azadibenzo[ ]tetracenes. Preliminary investigations indicate that resulting product, dimethyl 5,6,12,13‐tetrakis(hexyloxy)dibenzo[ ]tetracene‐2,9‐dicarboxylate, demonstrates favorable liquid‐crystalline properties.

Four new mesomorphic triphenylene-fused nitrogen-containing heterocyclic systems, including three benzimidazole and one perimidine derivatives with extended triphenylene core of different sizes are synthesised from the condensation reaction between aromatic diamines our developed dicarboxylic anhydrides. These discotic mesogens self-assemble into supramolecular columnar hexagonal mesophases high clearing transition temperatures, demonstrating a strong tendency for π-stacking aggregation in...

An efficient copper-catalyzed multicomponent reaction of phenols, amides, and 4-bromphenyl iodide was developed that uses commercially available N,N-dimethylglycine as the ligand. This proceeds in moderate to good yields for a range phenols amides. The simple experimental procedure high levels functional group compatibility make this method attractive applications on pesticides.

Two different tetrasubstituted benzenes were selectively constructed from the same starting materials by tuning active sites of Grubbs second generation catalyst (GC-II) with CuI or AgOTf as additive.

A palladium-catalyzed annulation reaction of 2-iodobiphenyls with 2-halogenoanilines has been developed. variety and can undergo this transformation. Diversified tribenzo[b,d,f]azepine derivatives be synthesized in moderate to excellent yields according method.

Herein, we report the synthesis and mesomorphic properties of a new series hexasubstituted triphenylene tetraesters with mix four β-alkoxycarbonyl two adjacent β-alkoxy chains. The key synthetic step involves efficient fourfold oxidation methyl groups (CH3) into carboxylic acid (CO2H) functions in precursor TPCm-(CH3)4 (m = 4, 6, 8, 10) bearing groups. crystal structure short-chain tetraester TPC4-(COOC4H9)4 showed that molecules form parallel slip-stacked dimer an interplanar spacing 3.38...

New monosubstituted ferrocenomesogens of the 1,4-substituted-1,2,3-triazole series 3a-3d and 5-halogen-1,4-substituted-1,2,3-triazole 4a-4d were successfully synthesised through a facile versatile synthetic route using click reactions with moderate yields, in different atmospheres, catalysed by amounts CuX (X = Br, I). Two compounds exhibited typical nematic liquid crystal texture, 4 had wider mesomorphic temperature range than corresponding 3 due to effect halogen atom substituent on...

An efficient protocol to synthesize unsymmetrical triphenylenes from electron-rich biphenyls and diaryliodonium salts via Cu catalysis was developed. A variety of with diversified functional groups were synthesized according this method. This transformation went through multiple direct C–H arylations easily produced starting materials high step-economy. The gram-scale synthesis their facile into diverse organic molecules illustrated.

Bay-region annulative π-extension of o-iodobiphenyls with aliphatic anhydrides was developed. Many and can react well under the optimized conditions. A lot phenanthrol derivatives be efficiently prepared by this approach. The control experiments support that dibenzopalladacyclopentadienes may reaction intermediates.

Copper-catalyzed regioselective C-H sulfonyloxylation of electron-rich arenes with p-toluenesulfonic acid has been developed. Electron-rich benzene derivatives and heteroarenes can undergo this reaction to generate aryl tosylates. Furthermore, aryl(mesityl)iodonium sulfonates also investigated. Both tosylates triflates react smoothly get sulfonates. The formed be converted phenols, as well used good partners cross-coupling reactions.

A comparative study of our established synthetic approaches to hexasubsituted triphenylenes 2,3-dicarboxylic esters containing four identical β-alkoxy and two adjacent β-alkoxycarbonyl side chains shows that the phase behaviours small-sized discotic liquid crystals can be tailored over a wide range by simply varying length peripheral alkyl chains. All prepared in series were observed form single hexagonal columnar phase, except for Tp4-1 having β-butyloxy β-methoxycarbonyl which displays...

Two series of triphenylene-based dimers both having a central fluoromethylene spacer four or six carbon atoms and ester amide linkages were synthesised their phase behaviour investigated. All the are room-temperature discotic liquid crystals exhibit hexagonal columnar mesophases that supercool into stable anisotropic glass. The length has minor effect on transition temperatures these dimers. However, 1a 2a with (CF2)4 approximately 40°C higher clearing points wider mesomorphic ranges...