Steroid alcohols are converted to their chloroformate esters by reaction with phosgene in the presence of a base. Replacement of chlorine by fluorine takes place smoothly by treatment with anhydrous thallous fluoride in ethylene glycol dimethyl ether. Significant shifts in the positions of both infrared spectra-carbonyl and carbon-oxygen single bond absorption frequency due to the fluorine are discussed.
类
固醇醇通过与
氯化亚
磷的反应,在碱的存在下转换为其
氯仿酸酯。用无
水氟化
铊在二甲基
乙二醇醚中处理后,
氯被
氟顺利替换。讨论了由于
氟的存在,红外光谱中羰基和碳-氧单键吸收频率位置的显著变化。