Titania-supported iridium catalysts for dehydrogenative synthesis of benzimidazoles

In this review, development of supported catalysts for the dehydrogenative synthesis of benzimidazoles is briefly summarized. Among them, rutile-supported iridium catalyst showed excellent activity under mild conditions. [Display omitted] In this review, development of supported catalysts for the de...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Veröffentlicht in:Chinese chemical letters 2020-03, Vol.31 (3), p.605-608
Hauptverfasser: Wada, Kenji, Yu, Han, Feng, Qi
Format: Artikel
Sprache:eng
Schlagworte:
Online-Zugang:Volltext
Tags: Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
Beschreibung
Zusammenfassung:In this review, development of supported catalysts for the dehydrogenative synthesis of benzimidazoles is briefly summarized. Among them, rutile-supported iridium catalyst showed excellent activity under mild conditions. [Display omitted] In this review, development of supported catalysts for the dehydrogenative synthesis of benzimidazoles from primary alcohols and 1,2-phenylenediamine derivatives is briefly summarized. Among them, titania-supported iridium catalysts showed excellent activities under mild reaction conditions. Remarkably, the low-temperature activity of iridium catalyst was significantly affected by titania supports, and the reaction of 1,2-phenylenediamine and benzyl alcohol in the presence of rutile-supported catalysts proceeded smoothly at 100 °C to give 2-phenylbenzimidazole in high yields of up to 88%. On the other hand, catalysts supported on anatase generally showed poor activity at 100 °C. A significant relationship between CO uptake and the activity of titania-supported catalysts has been reported, indicating that well-reduced iridium species on rutile would be responsible for the predominant catalytic activity. The present results suggest the importance of the selection of suitable titania supports for the iridium catalysts.
ISSN:1001-8417
1878-5964
DOI:10.1016/j.cclet.2019.05.054