Über die Temperaturabhängigkeit der 13C-NMR.-Spektren von Tetracarbonyl (η-(Z)-cycloocten)eisen und (Z)-cycloocten

✍ Scribed by Martin Von Büren; Marcel Cosandey; Hans-Jürgen Hansen

• Publisher: John Wiley and Sons
• Year: 1980
• Tongue: German
• Weight: 375 KB
• Volume: 63
• Category: Article
• ISSN: 0018-019X
• DOI: 10.1002/hlca.19800630417

✦ Synopsis

On the Temperature Dependence of the ^13^C‐NMR.‐Spectra of Tetracarbonyl (η‐(Z)‐cyclooctene)iron and of (Z)‐Cyclooctene

Reaction of (Z)‐cyclooctene (1) with Fe~2~(CO)~9~ in pentane at 0° yielded tetracarbonyl(η‐(Z)‐cyclooctene)iron (2) as a yellow oil which can be stored over a longer period only at −78°.

It is shown that the title compounds (1 and 2, respectively) are fluxional.

The activation parameters for the conformational C‐atom site exchange of (Z)‐cyclooctene (1) and tetracarbonyl (η‐(Z)‐cyclooctene)iron (2) (in CCl~2~F~2~) have been determined between 113 K and 151 K for 1 and between 151 K and 205 K for 2, respectively, by a complete line shape analysis of the temperature dependent proton noise‐decoupled ^13^C‐NMR. signals of the olefinic C‐atom. The kinetic data and activation parameters are given in Tables 1 and 2.