Title: Untersuchungen zur Synthese von (25R)-22-Oxocholest-5-en-3[beta],26-diol und (25R,22[xi])-Cholest-5-en-3[beta],22,26-triol sowie 5[alpha],6-3H2(25R)-22-Oxocholest-5-en-3[beta],26-diol und 5[alpha],6-3H2(25R,22[xi])-Cholest-5-en-3[beta],22,26-triol