A Simple Route to Ruthenacycloalkanes

✍ Scribed by Prof. Dr. Ekkehard Lindner; Rolf-Michael Jansen; Dr. Hermann August Mayer

• Publisher: John Wiley and Sons
• Year: 1986
• Tongue: English
• Weight: 235 KB
• Volume: 25
• Category: Article
• ISSN: 0044-8249
• DOI: 10.1002/anie.198610081

✦ Synopsis

The intensity of the two lines at 25 MHz remained constant over the concentration range investigated, and, since the maximum line separation is ca. 0.4 MHz, that is the magnetic environment of the two protons is very similar, significantly different relaxation effects are highly improbable. For these reasons, differences in the solvation of the phenoxyl radicals can be ruled out as an explanation for the doublet at ca. 25 MHz. We therefore attribute the two signals to diastereomeric solvates.

The coupling of the proton at the asymmetric C-atom can be attributed to a hyperconjugation rnechanisml8] corresponding to = ( B , + B(cos2 O)pCn). Whether B or the torsion angle 0 is responsible for the splitting will be explained by further systematic investigations of analogous systems. Since the couplings of the two ring protons a3.s remain constant no significant change in the spin density distribution can be expected during the formation of the diastereomers.