Silica-grafted DBU-supported NiCl2: a sustainable heterogeneous catalyst for A3 coupling

Silica-grafted DBU-supported NiCl2: a sustainable heterogeneous catalyst for A3 coupling

Silica-grafted DBU-supported NiCl 2 complex, 1-(3-((3-(silica-trioxysilyl) propyl) amino) propyl) azepan-2-one nickel chloride (SiO 2 @DBU-NiCl 2 ), has been designed and synthesized by multistep approach and characterized by FT-IR, XRD, EDS, FE-SEM, TGA and XPS. Catalytic activity of SiO 2 @DBU-NiC...

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Veröffentlicht in:Research on chemical intermediates 2023-06, Vol.49 (6), p.2359-2382
Hauptverfasser: Pharande, P. S., Rashinkar, G. S., Pore, D. M.
Format: Artikel
Sprache:eng
Schlagworte:
Aldehydes
Alkynes
Amines
Catalysis
Catalysts
Catalytic activity
Chemistry
Chemistry and Materials Science
Coupling
Inorganic Chemistry
Nickel chloride
Physical Chemistry
Recyclability
Silicon dioxide
X ray photoelectron spectroscopy
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Zusammenfassung:Silica-grafted DBU-supported NiCl 2 complex, 1-(3-((3-(silica-trioxysilyl) propyl) amino) propyl) azepan-2-one nickel chloride (SiO 2 @DBU-NiCl 2 ), has been designed and synthesized by multistep approach and characterized by FT-IR, XRD, EDS, FE-SEM, TGA and XPS. Catalytic activity of SiO 2 @DBU-NiCl 2 has been explored for A 3 coupling of terminal alkynes, aldehydes and secondary amines resulting in excellent yields (up to 97%). Special features of present protocol are high TONs (625–1212) and TOFs (52–404), low catalyst loading (0.08 mol %), solvent-free conditions, facile recyclability and reusability of the catalyst (up to 5 times).
ISSN:0922-6168
1568-5675
DOI:10.1007/s11164-023-04980-1