Homoleptic carbonyliron complexes

The tricarbonyliron fragment can be attached to a diene system by a variety of transfer reagents. Homoleptic carbonyliron complexes are the most simple ones and have been known for the longest time. The replacement of two carbonyl ligands in pentacarbonyliron by a diene ligand requires quite harsh conditions. A temperature of approximately 140 °C or irradiation is necessary to induce this dissociative process. (Scheme 4-101). ° ... 

Cyclopentadienones are formed in a [2+2+1] cycloaddition reaction of diynes with homoleptic carbonyliron complexes. This method is described in more detail in Section 2.1.2. The majority of (diene)iron complexes are obtained by addition of... 

Various /jara-substituted styrenes have been treated with triethylsilane in the presence of iron carbonyls to give selectively ( )-P-triethylsilyl styrenes and not the hydrosilylation product (silylethyl)benzene (Scheme 4-336). Dodecacarbonyltriion shows the highest activity among the homoleptic carbonyliron complexes, whereas pentacarbonyliron is inactive. ... 

---