Boehmite-derived Aluminum Oxide Catalyst for a Continuous Intramolecular Aldol Condensation of 2,5-Hexanedione to 3-Methyl-2-cyclopentenone in a Liquid-flow Reactor System

Boehmite-derived Aluminum Oxide Catalyst for a Continuous Intramolecular Aldol Condensation of 2,5-Hexanedione to 3-Methyl-2-cyclopentenone in a Liquid-flow Reactor System

After thermal treatment of boehmite at higher than 600 °C and 1100 °C, the crystal phase transformation from AlOOH to γ-Al2O3 and/or δ-Al2O3 and the further transformations to the mixed phases of θ-Al2O3 and α-Al2O3, are respectively observed. Genesis of γ-Al2O3 (and/or δ-Al2O3) emphasizes the react...

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Veröffentlicht in:Chemistry letters 2022-02, Vol.51 (2), p.131-134
Hauptverfasser: Nishimura, Shun, Le, Son Dinh, Asai, Yusaku, Takahashi, Natsuki, Endo, Maho, Ohmatsu, Shintaro
Format: Artikel
Sprache:eng
Schlagworte:
Aldehydes
Aluminum oxide
Boehmite
Heat treatment
Liquid flow
Phase transitions
Recyclability
Selectivity
Transitional aluminas
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Zusammenfassung:After thermal treatment of boehmite at higher than 600 °C and 1100 °C, the crystal phase transformation from AlOOH to γ-Al2O3 and/or δ-Al2O3 and the further transformations to the mixed phases of θ-Al2O3 and α-Al2O3, are respectively observed. Genesis of γ-Al2O3 (and/or δ-Al2O3) emphasizes the reactivity on an intramolecular aldol condensation of 2,5-hexanedione to 3-methyl-2-cyclopentenone (MCP) and its recyclability: approx. 70% yield with more than 80% selectivity for MCP generation are achieved in a liquid-flow reactor system for 9 h.
ISSN:0366-7022
1348-0715
DOI:10.1246/cl.210616