aprotic solvent gave rise to 4,4-dimethyl-1-methylene-5α-cholestan-3-one oxime in 69–75% yield; mechanism for this photo-isomerization which involves an intramolecular stereospecific transfer of a hydroxyimino hydrogen is proposed on the basis of deuterium labelling studies.
(照射ë)-1,4,4三甲基-5- α -cholest -1-烯-3-酮
肟在质子或质子惰性溶剂就产生了4,4-二甲基-1-亚甲基- 5 α -
胆甾醇-3-一
肟,产率69-75%;在
氘标记研究的基础上,提出了涉及羟基亚
氨基氢的分子内立体定向转移的这种光异构化的机理。