| http://www.w3.org/ns/prov#value | - Such protecting groups are, therefore, preferred.Thus according to a particularly preferred embodiment of the present invention there is provided a process for the 1.alpha.-hydroxylation of vitamin D compounds by SE.sup.IV oxidation which comprises the oxidation of a1-unsubstituted-3-trihydrocarbylsilyloxy-5,6-transvitamin D compound at a pH in the range 3-9 in the presence of selenous acid and a
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