Synthesis and Properties of Medium-Sized cis,trans-Cycloocta-1,3-diene-Pt(II) Complexes
Hayate Kinouchi1, Tomohiro Ito1, Aki Kohyama1
1Graduate School of Pharmaceutical Sciences, Kyoto University, Yoshida, Sakyo-ku, Kyoto 606-8501, Japan.
Abstract:
cis,trans-Cycloocta-1,3-dienes (TCODs) are highly strained and elusive due to rapid 4π-electrocyclization. Here, we report the first stable isolation of cis,trans-cycloocta-1,3-dienes as Pt(II) complexes. X-ray crystallography revealed marked elongation of the trans C═C bond and dihedral distortion relative to trans-cyclooctenes (TCOs). The Pt-TCOD complexes underwent ligand exchange, desilylation to π-allyl species, and enantioselective decomplexation. These findings establish TCOD-metal complexes as isolable surrogates for elusive strained alkenes, providing a foundation for new developments in organometallic and strained-ring chemistry.
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