Encapsulation ofN-heterocyclic carbene-gold (I) catalysts within magnetic core/shell silica gels: A reusable alkyne hydration catalyst

ÖZTÜRK B. Ö., Cetinel B., KARABULUT ŞEHİTOĞLU S.

APPLIED ORGANOMETALLIC CHEMISTRY, cilt.34, sa.9, 2020 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 34 Sayı: 9
  • Basım Tarihi: 2020
  • Doi Numarası: 10.1002/aoc.5686
  • Dergi Adı: APPLIED ORGANOMETALLIC CHEMISTRY
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, BIOSIS, Chimica, Communication Abstracts, Compendex, Metadex, DIALNET, Civil Engineering Abstracts
  • Anahtar Kelimeler: alkyne hydration, core, shell structure, encapsulation, NHC-gold complexes, silica gel, GOLD(I)-CATALYZED ALKOXYLATION, REACTION-MECHANISM, HIGHLY EFFICIENT, PIVOTAL ROLE, COMPLEXES, LIGAND, OXIDATION, COUNTERION, REACTIVITY, NANOPARTICLES
  • Hacettepe Üniversitesi Adresli: Evet

Özet

In this study,N-heterocyclic carbene-Au(I) complex, chloro[1,3-bis(2,6-diisopropylphenyl)imidazol-2-ylidene]gold (I), was successfully encapsulated within mesopores of a magnetic core/shell (gamma-Fe2O3@SiO2) silica gel through post-pore-size reduction by silylation reactions The post-reduction of the pore size not only minimizes the catalyst leaching during the alkyne hydration reactions but also eliminates any need for covalent modification of the catalyst or support surface. The resulting catalyst exhibits high activity in hydration reactions of various alkynes even under low catalytic loadings. The catalyst can be easily recycled from the reaction mixture using a magnet and can be reused in alkyne hydration reactions up to six times with only 52. wt% Au leaching.