Racemic trans-4,4,7,9-tetramethyl-3 β-hydroxy-decalone-(8) (Xa) has been synthesized. The corresponding optically active levorotatory compound had been previously obtained by R. Rüegg, J. Dreiding, O. Jeger and L. Ruzicka, as a degradation product of α-amyrin. The stereoisomer racemic cis-4,4,7,9-tetramethyl-3 α-hydroxy-decalone-(8) (XIVa) and the two hydroxyketones (±)-trans-4,4,7-trimethyl-3 β-hydroxy-decalone-(8)
已经合成了外消旋的反式-4,4,7,9-四甲基-3β-羟基
癸酮(8)(Xa)。相应的旋光性左旋化合物是先前由R.Rüegg,J.Dreiding,O.Jeger和L.Ruzicka作为α-amyrin的降解产物而获得的。立体异构体外消旋体顺式4,4,7,9-四甲基-3α-羟基十酮-(8)(XIVa)和两个羟基酮(±)-反式-4,4,7-三甲基-3β-羟基-十酮还获得了-(8)(XIIIa)和(±)-顺-4,4,7-三甲基-3β-羟基-
癸酮-(8)(IXa)作为合成的副产物。