Highly Efficient and Reusable Polyaniline‐Supported Palladium Catalysts for Open‐Air Oxidative Heck Reactions under Base‐ and Ligand‐Free Conditions

Abstract

Oxidative Heck reactions of arylboronic acids and alkenes are carried out in the presence of polyaniline-supported palladium catalysts using air as a co-oxidant to afford the Heck products with excellent yields and selectivities under base-and ligand-free conditions. The catalyst was recovered by simple filtration and used for several cycles with consistent activity.

Fe3O4@mesoporouspolyaniline: A Highly Efficient and Magnetically Separable Catalyst for Cross‐Coupling of Aryl Chlorides and Phenols

“…In continuation of our studies on the applications of environmentally benign catalysts for the development of useful new synthetic methodologies with PANI, [18] we focused our attention on the preparation of porous Fe 3 O 4 nanoparticles encaged in mesoporouspolyaniline microspheres, Fe 3 O 4 @mPANI, its characterization and its catalytic application in the synthesis of diaryl ethers from aryl chlorides and phenols. The thermal and chemical stability of Fe 3 O 4 @mPANI could enable activation of the C À Cl bond of aryl chlorides in the cross-coupling without deforming or aggregating the Fe 3 O 4 nanoparticles, which was not possible with bare magnetic Fe 3 O 4 nanoparticles.…”

Palladium–Poly(3‐aminoquinoline) Hollow‐Sphere Composite: Application in Sonogashira Coupling Reactions

“…[41,42] We found that not all Pd 2 + was converted to Pd + and unreacted Pd 2 + species could coordinate with chain 'N' of the polymer. [43] XPS analysis indicates that 1.64 wt % of palladium was present on the surface of the polymer matrix. TEM analysis failed to reveal any evidence of the formation of metallic palladium in the sample.…”

Sinteza I Primjena Diiminskih Liganada U Oksidativnoj Heckovoj Reakciji

“…Stabiliziranje katalizatora ligandima je omogućilo smanjenje korištenja katalizatora sve do 1 % u poređenju sa 10 ili 20 % koliko je korišteno u prethodnim slučajevima. Kompleks formiran između Pd(OAc) 2 i 2,9-dimetil-1,10-fenantrolina (DmPhen) je mogao katalizirati reakciju alkena sa različitim supstituiranim arilbornim kiselinama u izvrsnom iskorištenju (9,10). Kakogod, kada su korišteni supstrati kao što je 2-cikloheksenon i sterički nepovoljna borna kiselina, DmPhen-Pd-kompleks formira sporedne produkte kao što su homokuplovani produkti i fenoli, smanjujući prinos produkta.…”