Title :

Gem-diols-type intermediate of ketone activation on sn-? zeolite as studied by solid-state nmr spectroscopy

Author(s) :

Qi, Guodong [Auteur]
Chu, Yueying [Auteur]
Wang, Qiang [Auteur]
Wang, Xingxing [Auteur]
Li, Yi [Auteur]
Trebosc, Julien [Auteur]
Lafon, Olivier [Auteur]
Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181
Xu, Jun [Auteur]
Deng, Feng [Auteur]

Journal title :

Angewandte Chemie (International ed. in English)

Abbreviated title :

Angew. Chem. Int. Ed. Engl.

Publication date :

2020-05-25

ISSN :

1521-3773

Keyword(s) :

biomass conversion
zeolites
ketones
carbonyl groups
solid-state NMR spectroscopy

HAL domain(s) :

Chimie/Catalyse

English abstract : [en]

Lewis acid zeolites have found increasing application in the field of biomass conversion, in which the selective transformation of carbonyl-containing molecules is of particular importance due to their relevance in organic ...
Show more >Lewis acid zeolites have found increasing application in the field of biomass conversion, in which the selective transformation of carbonyl-containing molecules is of particular importance due to their relevance in organic synthesis. Mechanistic insight into the activation of carbonyl groups on Lewis acid sites is challenging and critical for the understanding of the catalytic process, which requires the identification of reaction intermediates. Here we report the observation of a stable surface gem-diol-type species in the activation of acetone on Sn-β zeolite. 13 C, 119 Sn, and 13 C-119 Sn double-resonance NMR spectroscopic studies demonstrate that only the open Sn site ((SiO)3 Sn-OH) on Sn-β is responsible for the formation of the surface species. 13 C MAS NMR experiments together with density functional theory calculations suggest that the gem-diol-type species exhibits high reactivity and can serve as an active intermediate in the Meerwein-Ponndorf-Verley-Oppenauer (MPVO) reaction of acetone with cyclohexanol. The gem-diol-type species offers an energy-preferable pathway for the direct carbon-to-carbon hydrogen transfer between ketone and alcohol. The results provide new insights into the transformation of carbonyl-containing molecules catalyzed by Lewis acid zeolites.Show less >

Language :

Anglais

Audience :

Internationale

Popular science :

Non

Administrative institution(s) :

CNRS
Centrale Lille
ENSCL
Univ. Artois
Université de Lille

Collections :

• Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181

Research team(s) :

RMN et matériaux inorganiques (RM2I)

Submission date :

2022-03-02T07:14:46Z