Simple Schiff‐Base Cu(II) Complexes as Efficient Catalysts for Benzyl Alcohol Oxidation. Issue 32 (30th August 2018)

• Record Type: Journal Article
• Authors: Czepa, Włodzimierz; Fik, Marta A.; Witomska, Samanta; Kubicki, Maciej; Consiglio, Giuseppe; Pawluć, Piotr; Patroniak, Violetta
• Is Part Of: ChemistrySelect. Volume 3:Issue 32(2018)
• Page Start: 9504
• Page End: 9509
• Publication Date: 2018-08-30
• Subjects: catalysis -- complex -- copper (II) -- oxidation -- Schiff base; Chemistry -- Periodicals; 540.5
• DOI: 10.1002/slct.201801550
• Languages: English
• ISSNs: 2365-6549

Abstract

Abstract: Herein, we present synthesis and characterization of new ligand with N2 O‐donor moiety based on benzothiazole unit and its two complexes with Cu(II) cations. X‐ray diffraction measurements revealed solid state structures of presented compounds as mono‐ and dinuclear entities. Both complexes appeared to be highly effective catalysts in oxidation process of benzyl alcohol and its derivatives in aqueous media. Copper(II)‐(2, 2, 6, 6‐tetramethylpiperidine‐1‐oxyl) system provides selective conversion in the presence of 0.25 mol% and 1 mol% for complex1 and2, respectively. Obtained results revealed that both copper complexes are highly selective towards benzyl alcohols oxidation to its carbonyl analogues. It was tested in the presence of several electron donating and accepting substituents. Consequently, presented systems can provide effective catalytic oxidation of aforementioned groups in the presence of aliphatic alcohols. Abstract : The reaction of Schiff‐base ligand with N2 O‐donor pocket with copper salts resulted in two novel complexes with significant potential in benzyl alcohols oxidation. Both compounds were chemically and structurally characterized and investigated towards selective oxidation of aforementioned alcohols in basic, aqueous solutions in the presence of TEMPO [(2, 2, 6, 6‐tetramethylpiperidin‐1‐yl)oxyl] radical. Complexes exhibited high catalytic activity providing selective conversions to aldehydes in the presence relative low catalysts amounts (0.25‐1 mol%).