Selective Synthesis and Reactivity of η5-Arylcyclohexadienyliron Complexes

✍ Scribed by David A. Owen; Andrei V. Malkov; Ian M. Palotai; Caroline Roe; Elizabeth J. Sandoe; G. Richard Stephenson

• Book ID: 101837247
• Publisher: John Wiley and Sons
• Year: 2007
• Tongue: English
• Weight: 378 KB
• Volume: 13
• Category: Article
• ISSN: 0947-6539
• DOI: 10.1002/chem.200601513

✦ Synopsis

Abstract

A series of aryl‐substituted cyclohexadienyliron complexes have been prepared by a general procedure that determines regioselectivity by correctly positioning leaving groups in the precursor complexes. The aryl groups at 1‐C or 2‐C have been shown to be ω directing by the study of reactions with a representative range of nucleophiles, and these regioselectivity properties have been related to the spectroscopic properties of the cationic cyclohexadienyliron complexes. A high level of electron‐donating substituents on the arene, or switching between the [Fe(CO)~3~] and [Fe(CO)~2~PPh~3~] series, reduces the minor ipso pathway, improving regiocontrol. Placing opposed directing groups in the arylcyclohexadienyliron complexes reverts reactivity to the ipso pathway with stabilised enolate nucleophiles, and when the additional directing group reinforces the effect of the aryl group, the ipso pathway is stopped.