The phototransformation of the 3‐cyclohexenyloxychromenones by irradiation with a pyrex‐filtered light from a 125 W Hg vapor lamp under an inert atmosphere into the spirocyclic fused xanthenones was described. The efficacy of the protocol depended upon the position (o‐, m‐, or p‐) of the cyclohexenyloxy group appended to the 2‐aryl moiety on the chromenone nucleus, which was further invoked by steric
描述了通过在惰性气氛下用125 W Hg蒸气灯的耐热
玻璃过滤光辐照3-
环己烯基氧
色酮到螺环稠合的
蒽酮的光转化。该协议的有效性取决于
环己烯氧基在
色酮核上2-芳基部分附加的位置(o-,m-或p-),这在空间,电子和邻近方面都需要进一步考虑。使用光谱数据(IR和NMR)确定基材和光产物的结构。