Ionic chitosan Schiff bases supported Pd(II) and Ru(II) complexes; production, characterization, and catalytic performance in Suzuki cross-coupling reactions

Chitosan‐Ethylenediaminetetraacetic acid‐palladium composite for the Suzuki–Miyaura reaction

“…Purification of biaryl products was performed by flash chromatography using silica gel. 1 H NMR and 13 C NMR spectra were recorded on a Bruker Biospin AVANCE 300-MHz spectrometer with TMS as an internal reference. Gas chromatography analysis was performed using Shimadzu GC-17 A with dodecane as an internal standard.…”

“…[1][2][3] Among the crosscoupling reactions, the Suzuki-Miyaura reaction is one of the powerful tools to create a carbon-carbon bond from the cross-coupling of aryl boronic acid and aryl halides using a palladium catalyst to synthesize biaryls for industrial uses related to pharmaceuticals, agrochemicals, polymers, and materials. [4,5] Recently, many research groups have demonstrated the use of various kinds of materials as catalyst support for the Suzuki-Miyaura reaction, including organic and inorganic compounds such as metal oxides, [6][7][8][9][10] polymers, [11][12][13][14][15][16][17][18] carbon materials, [19,20] and composite materials. [21,22] Among these support materials, natural polymers have attracted much attention due to their availability, nontoxicity, biodegradability, and low cost.…”

“…Recently, many research groups have demonstrated the use of various kinds of materials as catalyst support for the Suzuki–Miyaura reaction, including organic and inorganic compounds such as metal oxides, [ 6–10 ] polymers, [ 11–18 ] carbon materials, [ 19,20 ] and composite materials. [ 21,22 ] Among these support materials, natural polymers have attracted much attention due to their availability, nontoxicity, biodegradability, and low cost.…”

Sulfamic acid grafted to cross-linked chitosan by dendritic units: a bio-based, highly efficient and heterogeneous organocatalyst for green synthesis of 2,3-dihydroquinazoline derivatives

“…1–14 Hence, the use of renewable biopolymers such as cellulose, chitin, sodium alginate, and especially chitosan for the design and preparation of efficient biodegradable and heterogeneous organocatalytic systems would be very desirable. 11,15–39 Among these scaffolds, chitosan (CS) is one of the most unique and widely used biopolymers, a natural and active cationic amino polysaccharide obtained from the alkaline N -deacetylation of chitin. 8,24,40–47 Indeed, chitosan has numerous applications in various fields such as preparation of new bio-based materials, 48–52 heterogeneous catalytic systems, 38,53–55 water purification, metal extraction, 56–59 electrolyte-based fuel cells, 60–62 sensors, 6,63 corrosion protection, 64 etc.…”

A PPh3 modified-chitosan supported Pd nanocatalyst for heterogeneous Suzuki–Miyaura cross coupling reactions

“…17 Therefore, a variety of modified-chitosan supported Pd catalysts containing different ligand units (e.g. Schiff bases, [35][36][37][38][39] NHCs, 40,41 and pincer ligands 42,43 ) have been developed for Suzuki-Miyaura coupling reactions. Notably, because of easily tunable steric and electronic properties, phosphine-based ligands and Schiff bases were the preferred classes of ligands for Suzuki reactions.…”