Photoadducts obtained by cycloaddition of isoprene with methyl 2,4-dioxopentanoate were converted to cyclopentene derivatives. The stereochemistry of the intermediate glycols was estabilished by chemical correlations to each other; only the cis-glycols were convertible to the cyclopentenes under the conditions employed, suggesting a fore-going acetylation of the hindered glycol functions.
通过
异戊二烯与 2,4-二氧
戊酸甲酯的环加成反应获得的光加合物转化为
环戊烯衍
生物。中间体二醇的立体
化学是通过相互之间的
化学相关性建立的;在所采用的条件下,只有顺式二醇可转化为
环戊烯,这表明受阻的二醇功能发生了乙酰化。