Über Pterinchemie. 71. Mitteilung. Trennung der Diastereomeren (6R)‐ und (6S)‐5,6,7,8‐Tetrahydro‐L‐neopterin

Separation of the Diastereomers (6R)- and (6S)-5,6,7,8-Tetrahydro-L-biopterin The mixture of the diastereomers of the tetraacetylderivative IV of (6RS)-5,6,7,8-tetrahydro-L-biopterin could be separated by fractional crystallisation in methanol into the diastereomers IV A and IV B. Hydrolysis with hydrochloric acid gives the pure, diastereomeric, (6R)- and (6S)-5,6,7,8-tetrahydro-L-biopterins.