【摘要】 光照（＞４７０ｎｍ）竹红菌乙素和Ｎａ＿２ＳＯ＿３的溶液可生成５或８位磺化和５，８－二位磺化的竹红菌乙素衍生物。竹红菌乙素的光磺化反应对反应条件（如氧的浓度、溶液的ｐＨ值、溶剂的极性）的变化非常敏感。在空气条件下，磺化速度比在无氧条件下大大加快，同时也防止了氧条件下的一些副反应如自敏光氧化等的发生。这一磺化反应发生的最佳ｐＨ值为７．０～７．７。磺化速度随溶剂极性的降低而迅速下降，强极性有机溶剂与缓冲液组成的混合溶剂（１：１／Ｖ：Ｖ）有利于该反应的发生。更多还原

【Abstract】 IIIumination of a solution contahing hypocrellih B（or A）and Na₂SO₃ leads to the formation of 5 or 8-sulfonated and 5,8-disulfonated hypocrellin B （or A）.The photo induced sulfonation of hypocrellins is very susceptible to the changes of reaction conditions such as the concentration of oxygen,pH value of the solution,and polarity of the solvent.In aeratedsolution,the rate of sulfonation is much faster than that in deaerated solution,and some sidereactions（e. g self-sensitized）which are favourable under oxygen can be prevented.The optimum pH value for the sulfonation is pH 7.0～7.7.The rate of the photo-sulfonation declines with the decrease of the polarity of the solvent.strongly polar solventsfacilitate the sulfonation of hypocrellins.更多还原