Palladium NanoparticlesImmobilized on Nano-silica Triazine Dendritic Polymer (Pdnp-nSTDP): An Efficient and Reusable Catalyst for Suzuki-Miyaura Cross-Coupling and Heck Reactions

A new catalyst based on palladium nanoparticles immobilized on nano-silica triazine dendritic polymer (Pdnp-nSTDP) was synthesized and characterized by FT-IR spectroscopy, thermogravimetric analysis, field emission scanning electron microscopy, energy dispersive X-ray, transmission electron microscopy and elemental analysis. The size of the palladium nanoparticles was determined to be 3.1±0.5 nm. This catalytic system showed high activity in the Suzuki–Miyaura cross-coupling of aryl iodides, bromides and chlorides with arylboronic acids and also in the Heck reaction of these aryl halides with styrenes. These reactions were best performed in a dimethylformamide (DMF)/water mixture (1:3) in the presence of only 0.006 mol% and 0.01 mol% of the catalyst, respectively, under conventional conditions and microwave irradiation to afford the desired coupling products in high yields. The Pdnp-nSTDP was also used as an efficient catalyst for the preparation of a series of star- and banana-shaped compounds with a benzene, pyridine, pyrimidine or 1,3,5-triazine unit as the central core. Moreover, the catalyst could be recovered easily and reused several times without any considerable loss of its catalytic activity

Mn (Br8TPPS) Supported on Amberlite IRA-400 as a Robust and Efficient Catalyst for Alkene Epoxidation and Alkane Hydroxylation

Manganese (III) meso-tetrakis(p-sulfonatophenyl)-β-octabromoporphyrin supported on Amberlite IRA-400 [Mn(Br8TPPS)-Ad-400] is a robust and efficient catalyst for epoxidation of alkenes and hydroxylation of alkanes with sodium periodate at room temperature

Electrochemical synthesis and crystal structure of zinc(II) complexes with N2N′2S2 amide–thioether hexadentate ligands.

Three novel complexes of zinc with hexadentate amide–thioether ligands were synthesized by electrochemical oxidation of zinc in dichloromethane–methanol solution. These compounds were characterized by elemental analyses, 1H NMR, and IR spectroscopy. The molecular structures of two complexes were determined by single crystal X-ray diffraction, indicating that, the metal atom is in a distorted octahedral environment with amide–thioether ligand acting as a hexadentate N2N′2S2 donor

Application of a multi-SO3H Brønsted acidic ionic liquid in water: A highly efficient and reusable catalyst for the regioselective and scaled-up synthesis of pyrazoles under mild conditions.

An elegant and efficient procedure with exceptionally mild conditions for the regioselective synthesis of pyrazoles by the reaction of various 1,3-diketones and hydrazines/hydrazides using a multi-SO3H Brønsted acidic room temperature ionic liquid as a powerful catalyst in aqueous media has been developed. The ionic liquid was easily separated from the reaction mixture and was recycled and used for at least six consecutive runs without any loss of activity

Efficient and environmentally-benign three-component synthesis of quinolines and bis-quinolines catalyzed by recyclable potassium dodecatungstocobaltate trihydrate under microwave irradiation.

Microwave-assisted one-pot three-component reaction between aromatic amines, aromatic aldehydes and phenylacetylene is accomplished efficiently in the presence of catalytic amounts of potassium dodecatungstocobaltate trihydrate (K5CoW12O40·3H2O) to afford the corresponding quinolines and bis-quinolines in excellent yields. Selective conversion of aromatic aldehyde and also arylacetylene to their corresponding quinolines in the presence of aliphatic aldehyde and alkylacetylene, respectively, can be considered as noteworthy advantages of this method and makes it a useful and attractive process for the synthesis of quinoline derivatives. The catalyst could be reused for several cycles without any significant loss of its catalytic activity