Highly Active and Reusable Kenaf Cellulose Supported Bio-Poly(hydroxamic acid) Functionalized Copper Catalysts for C–N Bond Formation Reactions

Abstract

*Distinctly active poly(hydroxamic acid) anchored copper (Cu) catalysts were synthesized from chemically modified kenaf cellulose. They were characterized by Fourier transform infrared spectroscopy (FT-IR), field emission scanning microscopy (FESEM), high resolution transmission electron microscopy (HRTEM), inductively coupled plasma atomic emission spectrometry (ICP-AES), UV-vis spectroscopy (UV), and X-ray photoelectron spectroscopy (XPS). The Cucatalysts were successfully applied to the Michael addition reaction of amines with α,β-unsaturated carbonyl/cyano compounds and to the Click reactions of organoazides with alkynes under mild reaction conditions. The catalysts enabled excellent yields (88% to 95%) in both of the C-N bond formation reactions and showed easy recycling with outstanding reusability for seven cycles without any distinguished decrease in their catalytic activity.

Material De Carbono Condutor a Partir Da Pirólise Do Bambu Para Aplicações Elétricas, Eletrotérmicas E Eletroquímicas

“…33 Essas propriedades instigaram o desenvolvimento de diferentes materiais com aplicações tecnológicas nas áreas estrutural, ambiental e de energia, bem como o desenvolvimento de dispositivos elétricos 34 , sensores eletroquímicos 35,36 e novos suportes catalíticos. 37 As diversas pesquisas reportadas sobre a potencialidade de aplicações da madeira em diferentes áreas, as semelhanças com a madeira e as vantagens ecológicas de produção, motivaram o interesse de novos grupos de pesquisa em explorar as propriedades da matriz vegetal do bambu para diferentes aplicações.…”