Nucleophilic Addition Reactions of Tricarbonyl [η5-1-(Phenylsulfonyl)cyclohexadienyl]iron(I) Complex

Article abstract of DOI:10.1002/jccs.199700054

Hydride abstraction of tricarbonyl[η⁴-1-(phenylsultonyl)-1,3-cyclohexadiene]iron(0) complex 2 with Ph₃C⁺PF₆^-, regiospecifically provided the title compound 3 in excellent yield. Cationic complex 3 could react with a variety of nucleophiles in good yields. Soft nucleophiles prefer to attack at the C-5 position, whereas hard nucleophiles such as methyllithium and the enolate of ethyl acetate gave the C-5 as well as the C-2 addition products. Some synthetic applications of the addition products were also studied.