Abstract
Tetracarbonyliron Complexes of trans‐Cycloalkenes and trans‐CycloalkadienesRelatively stable olefin tetracarbonyliron complexes were obtained by reaction of Fe2(CO)9 with trans‐cyclooctene (t‐1), trans‐cyclononene (t‐2) and trans‐cyclodecene (t‐3) (Scheme 2) in pentane solution at room temperature. Furthermore, trans,cis‐cycloocta‐1,5‐ and ‐1,3‐diene (t,c‐7 and t,c‐8) as well as trans,trans,cis‐2,8,12‐trans‐bicyclo[8.4.0]tetradecatriene (t,t,c‐9) gave stable complexes only with the trans‐configurated double bond (Scheme 3).An olefin tetracarbonyliron complex was also obtained with bicyclo[4.3.1]deca‐7,9‐diene (10) which reacted only at the strained bridge‐head double bond. The IR. spectra of the new complexes are in agreement with an equatorial position of the olefinic ligands in the trigonal bipyramide of the iron.
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