Photoreaction of benzocyclobutadienetricarbonyliron with pentacarbonyliron

Abstract
Irradiation of 1—2a(6a)-η-benzocyclobutadienetricarbonyliron (5) in the presence of Fe(CO)5 gives a mixture of 1—2a(6a)-η : 3-6-η-benzocyclobutadienebistricarbonyliron (6), 1—3a(7a)-η-ferraindenebistricarbonyiiron (3) 1—3a(7a)-η : 4–7-η-ferraindenebistricarbonyliron (4). 1–3a(7a)-η-ferra-2H-indenetricarbonyliron (7), and 1–3a(7a)-η-ferra-2H-indenetricarbonyliron (8); complex (6) is formed via diene-type co-ordination of the four ring π-electrons in (5), while complexes (3), (4) and (7), (8) result from cyclobutadiene ring opening and insertion of an Fe(CO)3 unit.

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