Harald Schwager

Umsetzung von trisethennickel(0) mit 7,7-difluorcyclopropabenzol in gegenwart von tetraethylethylendiamin

Summary The reaction of Ni(C 2 H 4 ) 3 with 7,7-difluorocyclopropabenzene in the presence of tetraethylethylenediamine leads to a nine-membered difluoromethano-bridged nickelacycle.

Chromatographische Enantiomerentrennung, chiroptische Eigenschaften und absolute Chiralität von Pentacyclo [7.4.1.12,7 .01,9 .02,7]pentadeca-3,5,10,12-tetraen-8-on, einem pentacyclischen Cyclopentanonderivat mitC2-Symmetrie

The title compound1 was resolved into enantiomers by medium-pressure liquid chromatography on microcrystalline triacetylcellulose in ethanol. After four cycles pure enantiomers were obtained ([α]D20 + and — 330°, resp., in ethanol) and their circular dichroism spectra recorded. From optical comparison with structurally related thujane derivatives and by applying the octant rule, for (—)-1 the chirality (7R, 9R) was deduced.