Collect. Czech. Chem. Commun. 1987, 52, 501-507

Ethylene dithioketals in ring a of 19β,28-epoxy-18α-oleanane; Mass spectra and reduction with deuterated Raney-nickel

Jiří Protiva, Rudolf Očadlík, Eva Klinotová, Jiří Klinot and Alois Vystrčil

Department of Organic Chemistry, Charles University, 128 40 Prague 2


Ethylene dithioketals in positions 1, 2 and 3 of 19β,28-epoxy-18α-oleanane were prepared and reduced with deuterated Raney-nickel. The mass spectra of dithioketals and corresponding 1,1-, 2,2- and 3,3-dideuterio derivatives were studied and discussed with the possibility of localizing the functional group in the A ring.