The chemistry of co-ordinated ligands. Part II. Iron tricarbonyl complexes of some cyclohexadienes

Abstract

Some cyclohexa-1,4-dienes substituted by methyl and/or methoxyl groups react with iron carbonyls to give mixtures of tricarbonylcyclohexa-1,3-dieneiron complexes, whose compositions have been investigated. These complexes react with triphenylmethyl fluoroborate to give tricarbonyl-π-cyclohexadienyliron fluoroborates, whose reactions with nucleophiles are described. Certain of these salts, derived from methoxy-substituted cyclohexadiene complexes, are readily hydrolysed to tricarbonylcyclohexa-2,4-dienoneiron and substituted derivatives of this compound. Spectra are discussed in relation to structural assignments.