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|Section2= |Section3= }} Cyclobutadieneiron tricarbonyl or (C4H4)Fe(CO)3 is an organoiron compound with the formula Fe(C4H4)(CO)3. It is a yellow solid that is soluble in organic solvents. It has been used in organic chemistry as a precursor for cyclobutadiene, which is an elusive species in the free state.〔D. Seyferth "(Cyclobutadiene)iron Tricarbonyl - A Case of Theory before Experiment" Organometallics 2003, volume 22, 2-20.〕 ==Preparation and structure== It was first prepared in 1965 by Rowland Pettit starting from cyclooctatetraene:〔''Cyclobutadiene- and Benzocyclobutadiene-Iron Tricarbonyl Complexes'' G. F. Emerson, L. Watts, R. Pettit; J. Am. Chem. Soc.; 1965; 87(1); 131-133. (First Page )〕〔''Cis-dichlorocyclobutene'' , Organic Syntheses, Coll. Vol. 6, p.422 (1988); Vol. 50, p.36 (1970) (Article ).〕〔''Iron, tricarbonyl (η4-1,3-cyclobutadiene)-'' R. Pettit and J. Henery Organic Syntheses, Coll. Vol. 6, p.310 (1988); Vol. 50, p.21 (1970) (Link )〕 : Cyclooctatetraene is chlorinated to the ()-bicyclic compound which reacts further with the alkyne dimethyl acetylenedicarboxylate in a Diels-Alder reaction followed by a reverse-DA reaction by pyrolysis at 200 °C releasing cis-dichlorocyclobutene. This compound reacts with ''di-iron nonacarbonyl'' (obtained from photolysis of iron pentacarbonyl) to give cyclobutadieneiron tricarbonyl. The compound is a half sandwich complex. The C-C distances are 1.426 Â. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Cyclobutadieneiron tricarbonyl」の詳細全文を読む スポンサード リンク
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