How phenyl makes a difference : mechanistic insights into the ruthenium(ii)-catalysed isomerisation of allylic alcohols

Manzini, Simone and Poater, Albert and Nelson, David and Cavallo, Luigi and Nolan, Steven P. (2014) How phenyl makes a difference : mechanistic insights into the ruthenium(ii)-catalysed isomerisation of allylic alcohols. Chemical Science, 5 (1). pp. 180-188. ISSN 2041-6520

Full text not available in this repository.Request a copy from the Strathclyde author

Abstract

[RuCl(η5-3-phenylindenyl)(PPh3)2] (1) has been shown to be a highly active catalyst for the isomerisation of allylic alcohols to the corresponding ketones. A variety of substrates undergo the transformation, typically with 0.25-0.5 mol% of catalyst at room temperature, outperforming commonly-used complexes such as [RuCl(Cp)(PPh3) 2] and [RuCl(η5-indenyl)(PPh3) 2]. Mechanistic experiments and density functional theory have been employed to investigate the mechanism and understand the effect of catalyst structure on reactivity. These investigations suggest a oxo-π-allyl mechanism is in operation, avoiding intermediate ruthenium hydride complexes and leading to a characteristic 1,3-deuterium shift. Important mechanistic insights from DFT and experiments also allowed for the design of a protocol that expands the scope of the transformation to include primary allylic alcohols.