Nb 2 O 5 ·nH 2 O as a Heterogeneous Catalyst with Water-Tolerant Lewis Acid Sites
2011; American Chemical Society; Volume: 133; Issue: 12 Linguagem: Inglês
10.1021/ja110482r
ISSN1943-2984
AutoresKiyotaka Nakajima, Yusuke Baba, Ryouhei Noma, Masaaki Kitano, Junko N. Kondo, Shigenobu Hayashi, Masahiko Hara,
Tópico(s)Polyoxometalates: Synthesis and Applications
ResumoNiobic acid, Nb2O5·nH2O, has been studied as a heterogeneous Lewis acid catalyst. NbO4 tetrahedra, Lewis acid sites, on Nb2O5·nH2O surface immediately form NbO4−H2O adducts in the presence of water. However, a part of the adducts can still function as effective Lewis acid sites, catalyzing the allylation of benzaldehyde with tetraallyl tin and the conversion of glucose into 5-(hydroxymethyl)furfural in water.
Referência(s)