Novel reaction of limonene(tricarbonyl)iron: synthesis and crystal structure of (η4-C10H16){C(OEt)C6H4Me-o}Fe(CO)2 and {(η4-C10H16)C(OEt)Ar}Fe(CO)2

Abstract

Reaction of limonene(tricarbonyl)iron (1) with aryl-lithium reagents gave intermediate acylmetallates, from which, by subsequent alkylation with Et₃OBF₄ in aqueous solution at 0 °C, the novel complexes (η⁴-C₁₀H₁₆){C(OEt)C₆H₄Me-o}Fe(CO)₂(4) and {(η³-C₁₀H₁₆)C(OEt)Ar}Fe(CO)₂(2), Ar = Ph; (3), Ar =p-MeC₆H₄; (5); Ar =p-MeOC₆H₄; and (6), Ar =p-CF₃C₆H₄ were obtained, the structures of (3) and (4) having been determined by X-ray crystallography.