Structure-activity relationship ofN-heterocyclic carbene-Pd(II)-imidazole complexes in Suzuki-Miyaura coupling between 4-methoxyphenyl chloride and phenylboronic acid

Design of an antenna effect Eu(III)-based metal-organic framework for highly selective sensing of Fe3

Highly selective sensing of Fe³⁺ is very important due to its great effect on biological systems. A novel ligand [1,1':4',1'':4'',1''':4''',1''''-quinquephenyl]-2,2'',2'''',5''-tetracarboxylic acid (H₄qptca) was designed and successfully obtained for the first time via three steps in high total yields according to the absorption spectrum of Fe³⁺. The europium(III)-based metal-organic framework derived from H₄qptca, {[Eu(qptca)_1/2(H₂qptca)_1/2(H₂O)₂]·DMF}_n (referred to as SLX-1), was then synthesized and used as a water-stable and highly selective luminescent sensor for Fe³⁺ in aqueous solution with a comparable detection limit using Ln-MOF probes (6.45 μM) through the antenna effect of SLX-1. Furthermore, the luminescence quenching mechanism was also proposed as a competitive absorption mechanism.

Synthesis, structures, DFT calculations, and catalytic application in the direct arylation of five-membered heteroarenes with aryl bromides of novel palladium-N-heterocyclic carbene PEPPSI-type complexes

A new series of Pd-catalysts was synthesized and fully characterized via spectroscopic methods and the Pd–NHC complexes were evaluated via the direct arylation process.

Vinylimidazole coordination modes to Pt and Au metal centers

Reaction conditions affect the coordination modes of vinylimidazole to platinum and gold.

Crystal structure of trans-dichlorido-(1,3-dimesityl-1H-imidazol-2(3H)-ylidene)-(5-methyl-3,4-dihydro-2H-pyrrole-κN)palladium(II), C25H31Cl2N3OPd

C25H31Cl2N3OPd, orthorhombic, Pbca (no. 61), a = 9.4083(4) Å, b = 17.1334(8) Å, c = 31.9251(14) Å, V = 5146.2(4) Å3, Z = 8, R gt(F) = 0.0600, wR ref(F 2) = 0.1232, T = 293(2) K.

A new bifunctional heterogeneous nanocatalyst for one-pot reduction-Schiff base condensation and reduction–carbonylation of nitroarenes

In this work, synthesis of Pd–NHC-γ-Fe₂O₃-n-butyl-SO₃H and its activity as a bifunctional heterogeneous nanocatalyst containing Pd–NHC and acidic functional groups, are described. This newly synthesized nanomagnetic catalyst is fully characterized by different methods such as FT-IR, XPS, TEM, VSM, ICP and TG analysis. At first, the catalytic activity of Pd–NHC-γ-Fe₂O₃-n-butyl-SO₃H is evaluated for the reduction of nitroarenes in aqueous media using NaBH₄ as a clean source of hydrogen generation at ambient temperature. Using the promising results obtained from the nitroarene reduction, this catalytic system is used for two one-pot protocols including reduction-Schiff base condensation and reduction–carbonylation of various nitroarenes. In these reactions the in situ formed amines are further reacted with aldehydes to yield imines or carbonylated to amides. The desired products are obtained in good to high yields in the presence of Pd–NHC-γ-Fe₂O₃-n-butyl-SO₃H as a bifunctional catalyst. The catalyst is reused with the aid of a magnetic bar for up to six consecutive cycles without any drastic loss of its catalytic activity.

This paper presents synthesis of Pd–NHC-γ-Fe₂O₃-n-butyl-SO₃H and its activity as bifunctional heterogeneous nanocatalyst containing Pd–NHC and acidic functional groups.

Highly active NHC–Pd(ii) complexes for cross coupling of aryl chlorides and arylboronic acids: an investigation of the effect of remote bulky groups

Highly active palladium(ii) complexes bearing remote bulky ligands for Suzuki–Miyaura coupling reactions under mild conditions are reported.

A new diphosphine-carbonyl complex of ruthenium: an efficient precursor for C–C and C–N bond coupling catalysis

Reaction of 1,2-bis(diphenylphosphino)benzene (dppbz) with [{Ru(CO)₂Cl₂}_n] affords [Ru(dppbz)(CO)₂Cl₂], which serves as an excellent pre-catalyst for Suzuki-type C–C coupling and Buchwald-type C–N coupling reactions.

The crystal structure of 1,3-bis(2,6-diiso-propylphenyl)imidazol-2-ylidene)-dibromido-(1-methyl-1H-imidazole-κ1N)palladium(II) – ethyl acetate – water (1/1/1), C31H42Br2N4Pd

C31H42Br2N4Pd, monoclinic, P21/c, a = 12.3093(14)Å, b = 15.2805(18) Å, c = 20.3205(17) Å, β = 112.213(5)°, V = 3538.5(7) Å3, Z = 4, R gt(F) = 0.0540, wR ref(F 2) = 0.1528, T = 298(2)K.

Crystal structure of dichlorido(1,3-bis(2,6-dimethyl-phenyl)-1H-3λ4-imidazol-2-yl)(isoquinolinyl)palladium(IV), C28H27Cl2N3Pd

C28H27Cl2N3Pd, monoclinic (no. 15), C2/c, a = 24.7394(17) Å, b = 15.9451(11) Å, c = 27.4301(19) Å, β = 107.8650°, V = 10293.7(12) Å3, Z = 16, R gt(F) = 0.0249, wR ref(F 2) = 0.1168, T = 100(2) K.

Synthesis and characterization of trinuclear N-heterocyclic carbene–palladium(ii) complexes and their applications in the Suzuki–Miyaura cross-coupling reaction

Five novel trinuclear N-heterocyclic carbene–palladium(ii) complexes 5a–e were conveniently synthesized in one step. The obtained palladium(ii) complexes were the effective catalyst precursors for the Suzuki–Miyaura coupling.

N-Heterocyclic carbene-palladium(ii)-1-methylimidazole complex-catalyzed Suzuki-Miyaura coupling of benzyl carbamates with arylboronic acids

The Suzuki-Miyaura coupling of benzyl carbamates with arylboronic acids was achieved in an environmentally benign medium. Using water as the sole solvent, such transformation took place very well to give the desired diarylmethane derivatives in good to almost quantitative yields in the presence of a well-defined NHC-Pd(ii)-Im complex under mild conditions. It is worth noting here that this is the first example of benzyl carbamates used in coupling reaction, thus affording a new method for the formation of diarylmethanes by palladium-catalyzed C-O bond activation.

N-heterocyclic carbene-palladium(II)-1-methylimidazole complex-catalyzed Suzuki-Miyaura coupling of benzyl sulfonates with arylboronic acids

The first example of palladium-catalyzed Suzuki-Miyaura coupling between benzyl sulfonates and arylboronic acids was reported in this paper. In the presence of a well-defined, air-stable and easily available NHC-Pd(II)-Im complex, all reactions worked well to give the desired products in good to almost quantitative yields under the optimal conditions. Electron-rich, -neutral, -poor and sterically-hindered substituents on both substrates are tolerated in such transformation, providing a convenient, efficient and alternative method for the synthesis of diarylmethanes.

Palladium(0)-mediated C–H bond activation of N-(naphthyl)salicylaldimine and related ligands: utilization of the resulting organopalladium complexes in catalytic C–C and C–N coupling reactions

Aldimine ligands undergo palladium(0) mediated C–H bond activation to afford cyclopalladated complexes, which efficiently catalyze C–C and C–N coupling.

N-heterocyclic carbene–palladium(ii)-1-methylimidazole complex catalyzed α-arylation reactions of tetralones with aryl chlorides and further transformation of the products

NHC–Pd(ii)–Im complex-catalyzed α-arylation of tetralones with aryl chlorides and further transformation of the products was reported.