Metal-metalloid bond containing complexes of the bulky organotellurium ligand: applications in catalysis of C–O coupling and aldehyde to amide transformation reactions. (3rd February 2023)

• Record Type: Journal Article
• Authors: Oswal, Preeti; Arora, Aayushi; Purohit, Suraj; Bahuguna, Anurag; Sharma, Pankaj; Roy, Jiben; Kumar, Arun
• Is Part Of: New journal of chemistry. Volume 47:Number 9(2023)
• Page Start: 4346
• Page End: 4354
• Publication Date: 2023-02-03
• Subjects: Chemistry -- Periodicals; Chimie -- Périodiques; 540
• DOI: 10.1039/d2nj04408k
• Languages: English
• ISSNs: 1144-0546

Abstract

Abstract : Air and moisture insensitive palladium and ruthenium complexes of the organotellurium ligand and their application in C–O coupling and aldehyde to amide transformation. Abstract : Anthracene-based ligand L1 comprising an imine functionality and a tellurium (Te) donor moiety has been prepared. This ligand L1 has been characterized using 1 H, 13 C and 125 Te NMR spectroscopic techniques. The novel palladium(ii ) complex 1 and ruthenium(ii ) complex 2 have been synthesized by reacting organotellurium ligand L1 and Na2 PdCl4 /[Ru p(cymene)Cl2 ]2, respectively. The Pd(ii ) complex 1 and Ru(ii ) complex 2 were characterized with high resolution mass spectrometry (HR-MS) and 125 Te NMR spectra. The molecular structures of complexes 1 and 2 were authenticated with single crystal X-ray diffraction. Both the complexes are thermally stable, robust, and air and moisture insensitive. Palladium complex 1 exhibits nearly square planar geometry. The molecular structure of complex 2 has a pseudo-octahedral half sandwich piano-stool geometry around ruthenium. The catalytic activity of complex 1 has been explored for O -arylation of phenol, whereas the catalytic activity of complex 2 was explored for aldehyde to amide conversion. A variety of structurally different chloroarenes have been coupled with phenol employing 1 as a catalyst. A wide range of aldehydes containing different functional groups ( viz. H, –Me, –NO2, F, OMe, Cl and Br at the para position) were readily converted into their corresponding amide by employing Ru(ii ) complex 2 as a catalyst in a reaction time of 12 hours.