A Selective Chromium Catalyst System for the Trimerization of Ethene and Its Coordination Chemistry

✍ Scribed by Stephan Peitz; Normen Peulecke; Bhaskar R. Aluri; Sven Hansen; Bernd H. Müller; Anke Spannenberg; Uwe Rosenthal; Mohammed H. Al-Hazmi; Fuad M. Mosa; Anina Wöhl; Wolfgang Müller

• Publisher: John Wiley and Sons
• Year: 2010
• Tongue: English
• Weight: 342 KB
• Volume: 2010
• Category: Article
• ISSN: 1434-1948
• DOI: 10.1002/ejic.201000044

✦ Synopsis

Abstract

In this paper a novel ligand of the type [PNPNH] is presented for the application in a new homogeneous highly selective ethene trimerization system for the formation of 1‐hexene, which consists of the chromium source CrCl~3~(thf)~3~, the ligand Ph~2~PN(__i__Pr)P(Ph)N(__i__Pr)H (1), and Et~3~Al as an activator in toluene. The excellent characteristics of this new system, e.g. very high selectivity to C~6~ with highest purity of the C~6~ fraction (>99 % 1‐hexene), activity on a constant level on a long timescale, use of small amounts of Et~3~Al as a cheap activator, and only very low production of PE, make it to a hot candidate for industrial application. Its organometallic background gives an indication of the nature of the active catalyst species.