A Highly Active Catalyst 2, 4, 6‐Tris (di‐4‐chlorobenzamido)‐1, 3, 5‐triazine Palladium (II) Chloride for the Green Synthesis of Substituted Dihydrobenzo[b]thiophene in Ionic Liquid. Issue 46 (8th December 2020)

• Record Type: Journal Article
• Authors: Sayedul Islam, Md.; Abu Sayid Mia, Md.
• Is Part Of: ChemistrySelect. Volume 5:Issue 46(2020)
• Page Start: 14632
• Page End: 14642
• Publication Date: 2020-12-08
• Subjects: Palladium metallodendrimer -- Tetra-n-butylammonium bromide (TBAB) -- Dihydrobenzo[b]thiophene -- Ionic liquid -- Homogeneous catalysis; Chemistry -- Periodicals; 540.5
• DOI: 10.1002/slct.202003674
• Languages: English
• ISSNs: 2365-6549

Abstract

Abstract: The palladium‐metallodendrimer (Pd‐MD) 2, 4, 6‐tris (di‐4‐chlorobenzamido)‐1, 3, 5‐triazine palladium (II) chloride was synthesized by the reaction of substituted triazine, substituted benzoyl chloride, and (Ph3 P)2 PdCl2 in DMF at 100 °C. This Pd‐MD was characterized by FTIR, 1 H NMR, 13 C NMR, Scanning Electron Microscopy (SEM), Energy Dispersive X‐ray (EDX), mass spectrometry, X‐ray photoelectron spectroscopy (XPS), elemental analysis, Thermogravimetric analysis (TGA), and Differential scanning calorimetry (DSC) methods. This catalyst was successfully applied for the green synthesis of different substituted alkyl 2, 3‐dihydrobenzo[ b ]thiophene‐2‐carboxylates in ionic liquid tetra‐n‐butylammonium bromide (TBAB) solution at 120 °C for 2.5 hours with a good to an excellent percentage of yields (75 % to 96 %). Importantly, this homogeneous catalytic system was easily recoverable and reusable at least five times without a significant loss of activity. Abstract : The palladium‐metallodendrimer (Pd‐MD) 2, 4, 6‐tris (di‐4‐chlorobenzamido)‐1, 3, 5‐triazine palladium (II) chloride was synthesized and characterized by FTIR, 1 H NMR, 13 C NMR, Scanning Electron Microscopy (SEM), Energy Dispersive X‐ray (EDX), mass spectrometry, X‐ray photoelectron spectroscopy (XPS), elemental analysis, Thermogravimetric analysis (TGA), and Differential scanning calorimetry (DSC) methods. This catalyst was effectively applied for the green synthesis of different substituted alkyl 2, 3‐dihydrobenzo[ b ]thiophene‐2‐carboxylates in ionic liquid tetra‐n‐butylammonium bromide (TBAB) solution at 120 °C for 2.5 hours with a good to an excellent percentage of yields (75 % to 96 %) with reusability.