Method for preparing 1.alpha.-hydroxyvitamin D compounds
 The invention relates to a process for separating 1.alpha.-hydroxyvitamin D compounds from their corresponding 1.alpha.-hydroxy-5,6-trans isomers in a mixture thereof by treating the mixture with a dienophile and then separating the resulting dienophil-adduct of the 1.alpha.-hydroxy-5,6-trans vitamin D isomer from the unreacted 1.alpha.-hydroxyvitamin D compound. 
Wisconsin Alumni Research Foundation
A A C
A61P A61P C07C
inventional inventional inventional
Mary E. Seok H. Heinrich K. Hector F.
Phelps Lee Schnoes DeLuca