A silica gel supported dual acidic ionic liquid: an efficient and recyclable heterogeneous catalyst for the one-pot synthesis of amidoalkyl naphthols

Labeling of HeLa cells using ZrO 2 : Yb 3 + - Er 3 + nanoparticles with upconversion emission

“…3(b) shows a broadening of the bands centered at 3600 and 564 cm −1 due to the presence of Si─OH and Si─O─Si bonds, respectively. 61,62 Other peaks at ∼2923 and 2351 cm −1 are related to C─H bonds and CO 2 impurities, respectively. The band located in the range of 3000 to 3400 cm −1 is associated with amine groups.…”

Poly(4-vinylpyridine)-supported dual acidic ionic liquid: an environmentally friendly heterogeneous catalyst for the one-pot synthesis of 4,4'-(arylmethylene)bis(3-methyl-1-phenyl-1H-pyrazol-5-ols)

“…9 A new peak also appeared at 1645 cm −1 , which is ascribed to the C-N (pyridine-CH 2 -) bond absorption. This observation confirms the N-alkylation of the pyridine ring.…”

Multicomponent Reactions in Ionic Liquids

“…[29], [30] Supported reagents offer the advantages of simple and safe catalyst recycling. [28] All MCR-IL based approaches to 1-amidoalkylnaphthols where highly substituent tolerant with excellent yields observed ith both electron donating and electron withdrawing aldehydes. Zaho et al has reported the combined Barbier / Friedel-Crafts alkylation of unsusbtituted benzaldehydes with allylbromide and phenols to yield 4-(2-hydroxyphenyl)-4-phenylbut-1-enes promoted by BuPyCl/SnCl•2H 2 O and their subsequent application to the synthesis of 4-(substituted phenyl)chromans (Scheme 3).…”

“…[23] Kotadia et al and Zhang independently reported the synthesis of similar 1-amidoalkylnaphthols using solid supported ionic liquids (SSILs). [28] Kotadia used a benzimidazolium based ionic liquid immobilized on silica based solid support, while Zhang conducted the reaction in the presence of polyethylene glycol (PEG)-based dicationic acidic ionic liquid as a catalyst under solvent-free conditions. [29], [30] Supported reagents offer the advantages of simple and safe catalyst recycling.…”