Hydrocarbon Complexes of Iron, Ruthenium, and Osmium. Part 15. Stereochemical Non-rigidity of Hexacarbonyldiruthenium Complexes of Monosubstituted Cyclo-octatetraenes

DOI: 10.1039/DT9800000552

Source and publish data:

Journal of the Chemical Society, Dalton Transactions p. 552 - 558 (1980)

Update date:2022-07-31

Topics:

Authors:

Edwards, Julie D.

Knox, Selby A. R.

Riera, Victor

Stone, F. Gordon A.

Read Full Text PDF DownLoad Join now for total 90,000,000 free articles

Article abstract of DOI:10.1039/DT9800000552

Complexes are obtained in good yield upon heating with the cyclo-octratetraenes C8H7R (R=Me, Ph, SiMe3, SiMePh2, SiPh3 or GeMe3), and are readily carbonylated to give hexacarbonyls .Variable-temperature 1H and 13C n.m.r. spectra reveal that in the latter the substituent R is attached to an unco-ordinated olefinic bond; however, its presence does not repress stereochemical non-rigidity of the kind established for the parent .Each of the complexes exists at low temperatures as a single isomer, but or warming a 'twitch' of the Ru2(CO)6 unit relative to the hydrocarbon occurs to generate another isomer in equilibrium.At ambient temperatures rapid interconvernsion of the isomers provides time-averaged chemical shifts for the cyclo-octatetraene ring protons.