Photochemical C–C coupling reaction of an iron acetylide complex [Fe(η5-C5Me5)(CO)2(C [triple bond, length as m-dash]CPh)] with alk-1-ynes (RC[triple bond, length as m-dash]CH) leading to cyclic compounds including paramagnetic iron(i) cyclopentadienone complexes [Fe(η5-C5Me5)(η4-2-Ph -5-R-C5H2O)]

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Munetaka Akita, Masako Terada and Yoshihiko Moro-oka


Abstract

Photolysis of [Fe(η5-C5Me5)(CO)2(C [triple bond, length as m-dash]CPh)] with methyl propynoate which bears a coordinating substituent (CO2Me) affords a metallabicyclic compound incorporating two molecules of the alkyne, whereas the reaction with alk-1-ynes (RC[triple bond, length as m-dash]CH) bearing a non-coordinating substituent (R = alkyl, Ph, SiMe3) produces paramagnetic 17e iron(I)-cyclopentadienone complexes [Fe(η5-C5Me5)(η4-2-Ph -5-R-C5H2O)].


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