gamma-CD CoBr2 complexes as catalysts in sulfide oxidation and its reused.

ROSSI, LAURA I.; PINILLA PEÑA, DIANA C.; GRANADOS, ALEJANDRO M.

Sustainable Chemistry and Pharmacy

Elsevier

Lugar: Ámsterdam; Año: 2022 vol. 28 p. 100712 - 100725

2352-5541

γCDCoBr2 complexes synthesized in ethyl acetate or dichloromethane solvents or CoBr2 were usedas catalysts in sulfoxidation reactions giving very good yields and high chemoselectivity. Sulfoxidationtakes place in the presence of other functional groups such as ?COOH, ?NO2 or ?CHO.A structure-reactivity analysis was carried out, correlating the Hammet σ parameters and the TOFvalues obtained in the oxidation reaction of the para-substituted arylmethylsulfides in the presenceof each catalyst. Additionally, the effect of groups of different sizes attached to sulfur atomwas analysed. Also, these reactions were evaluated using green chemistry metrics, good resultswere obtained in many cases. The solid complexes can be used several times, after three cycles theyield decreased only 7% (from 95 to 88%). Techniques as FT-IR and TGA were used to characterizeused complexes after 1st and 6th cycles.