WHEN a solution of 7-hydroxypteridine1 was spotted on a sheet of Whatman No. 1 filter paper, irradiated with ultra-violet light (principally 254 mµ) for 5 min., and developed (by ascending chromatography) in various solvents, two spots appeared. One of these was identical with the starting material (unirradiated material was used as a control on the same piece of paper), and the other proved to be
当 7-羟基蝶啶溶液被点在一张 Whatman No. 1 滤纸上,用紫外光(主要是 254 mµ)照射 5 分钟,并在各种溶剂中展开(通过升序色谱),出现两个点. 其中一个与起始材料相同(未辐照材料用作同一张纸上的对照),另一个证明是 5:6-二氢-7-羟基蝶啶1。该反应不会在
水溶液中发生(尽管 2:6-二羟基蝶啶 2 在
水中会发生光
化学变化),但如果烯丙基
硫脲作为氢供体存在(未辐射对照未还原),则会发生该反应。还发现 2- 和 4- 羟基蝶啶在纸上发生了光变;但产品尚未确定。