A comparative homocoupling reaction of aryl halides using monomeric orthopalladated complex of 4‐methoxybenzoylmethylenetri‐ phenylphosphorane under conventional and microwave irradiation conditions

Abstract

• C. In comparison to conventional heating conditions, the reactions under microwave irradiation gave higher yields in shorter reaction times.

Microwave-assisted Stille and Hiyama cross-coupling reactions catalyzed by ortho-palladated complexes of homoveratrylamine

“…The use of homogeneous metal catalysts in conjunction with microwave heating leads to increased lifetimes of the catalyst, saves time, and produces high yields of products with less by-product formation via thermal side-reactions. 22,23 In continuation of our recent investigations on the synthesis and applications of palladacycle catalysts in microwave assisted cross-coupling reactions, [24][25][26][27][28][29][30] we now report the extension of dimeric [Pd{C 6 H 2 (CH 2 CH 2 NH 2 )-(OMe) 2 -3,4}(l-Br)] 2 A suitable chemical production process utilizing palladium catalysis requires high catalyst productivity and activity. Also the availability and cost of catalysts and the price of the organic starting materials are of great importance for industrial processes.…”

Facile construction of symmetric biaryls using (BeDABCO)2Pd2Cl6 as an efficient and highly active catalyst under microwave irradiation

“…The residue was purified by silica gel column chromatography ( n ‐hexane–EtOAc, 90:10) or recrystallization. The products have been reported previously and characterized by comparing their melting points and IR, 1 H NMR and 13 C NMR spectra with those found in the literature …”

“…Transition metal‐catalysed homo‐coupling of aryl halides is a very efficient catalytic process for biaryl synthesis. Palladium, nickel, barium, indium, copper and rhodium have been used in these reactions. The most convenient method for the synthesis of symmetric biaryls is a reductive homo‐coupling of aryl halides by the Ullmann reaction, which requires harsh conditions such as equimolar amounts of copper, high temperature and strong bases.…”

Highly active recyclable heterogeneous nanonickel ferrite catalyst for cyanation of aryl and heteroaryl halides

“…In addition, completion of the reactions under conventional heating conditions required several hours and reactions were performed faster only using microwave irradiation. Herein, in a continuation of our previous work, we report the application of a highly active recyclable heterogeneous nanonickel ferrite catalyst for the cyanation reaction of various aryl halides under conventional heating conditions. Compared to previous palladium‐based unrecyclable catalysts, this catalyst not only is of low cost, but also is readily prepared in a few steps from available starting materials.…”