Degradation of the Second-Generation Grubbs Metathesis Catalyst with Primary Alcohols and Oxygen − Isomerization and Hydrogenation Activities of Monocarbonyl Complexes

✍ Scribed by Maarten B. Dinger; Johannes C. Mol

• Book ID: 102168944
• Publisher: John Wiley and Sons
• Year: 2003
• Tongue: English
• Weight: 142 KB
• Volume: 2003
• Category: Article
• ISSN: 1434-1948
• DOI: 10.1002/ejic.200200702

✦ Synopsis

Abstract

Reaction of the second‐generation Grubbs metathesis catalyst [RuCl~2~(=CHPh)(H~2~IMes)(PCy~3~)] (2) (H~2~IMes = 1,3‐dimethyl‐4,5‐dihydroimidazol‐2‐ylidene) with primary alcohols in the presence of a base produced the complexes [RuClH(CO)(PCy~3~)~2~] (3) and [RuClH(CO)(H~2~IMes)(PCy~3~)] (5). When benzyl alcohol was used, the ruthenium phenyl complexes [RuClPh(CO)(PCy~3~)~2~] (4) and [RuClPh(CO)(H~2~IMes)(PCy~3~)] (7) were formed in addition to 3 and 5. Complex 7, characterised by an X‐ray structure analysis, was also formed on exposure of 2 to oxygen. The isomerization and hydrogenation activity of 7 was determined and compared with that of 3 and 4. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003)