Synthesis of some ruthenium(II)–Schiff base complexes bearing sulfonamide fragment: New catalysts for transfer hydrogenation of ketones

Synthesis, characterization, CT‐DNA binding and docking studies of novel selenated ligands and their palladium complexes

“…In the 1 H NMR spectra of ligands ( S ) ‐L 1 H and ( S ) ‐L 2 H , a singlet for the phenolic (OH) proton appeared at δ , 13.88 and 10.85 ppm, respectively. This OH proton was highly deshielded in ( S ) ‐L 1 H owing to the presence of strong OH⋯N intramolecular hydrogen bonding as observed generally in the Schiff bases of 2‐hydroxy aldehydes or ketones 39 . The peak for phenolic proton disappeared from the spectra of their respective complexes ( S ) ‐1 and ( S ) ‐2 , which confirmed the coordination of deprotonated ligands [( S ) ‐L 1 and ( S ) ‐L 2 ] through the phenolate (PhO − ) ion to the central Pd (II) ion.…”

The Golden Age of Transfer Hydrogenation

“…Various primary amines were produced with up to >99% ee and excellent yields upon using both aromatic and aliphatic sulfinylimines with 2-PrOH as the hydrogen source (Scheme ) . A new half-sandwich ruthenium compound readily prepared from [RuCl 2 ( p -cymene)] 2 with the Schiff base scaffold 78 was examined as catalyst in the TH of ketones, and up to 1260 h –1 TOF was obtained . Following the development of thio- ligand in ruthenium-catalyzed TH, a new cationic half-sandwich complex of the type [(η 6 -cymene)­Ru­(PPh 3 )­(L)] + was synthesized as an air-stable salt.…”

“…356 A new half-sandwich ruthenium compound readily prepared from [RuCl 2 (p-cymene)] 2 with the Schiff base scaffold 78 was examined as catalyst in the TH of ketones, and up to 1260 h −1 TOF was obtained. 357 Following the development of thio-ligand in rutheniumcatalyzed TH, 358 a new cationic half-sandwich complex of the type [(η 6 -cymene)Ru(PPh 3 )(L)] + was synthesized as an air-stable salt. This complex contains a thioamide ligand 79 that is coordinated to Ru as a bidentate O, S donor with a typical piano-stool geometry.…”

Asymmetric Schiff base ligand enables synthesis of fluorescent and near-IR emitting lanthanide compounds

“…Selected IR data (KBr, cm −1 ); 3425(s),3056(w), 2931(w), 2847(w), 1607(s), 1535(m), 1463(s), 1385(m), 1311(w), 1221(w), 1186(w), 858(w), 742(m). λmax (nm) (ɛ(M − 1 cm −1 )): 245 (73,723), 313 (7204), 349 (4359) and 429 (17,146)…”

“…Lanthanide(III) ions are the best ions with the largest size that are able to form stable complexes with high coordination numbers [11]. In between, lanthanide (III) complexes containing Schiff base provide a highly organized class of compounds with interesting properties such as antifungal [12], antibacterial [13], anticancer [14], catalytic [15], electroluminescence and fluorescence, sensing [16][17][18] biological activities [19], and unique magnetic properties [20].…”