The irradiation of 5,5-dimethyl-3-(4-methyl-3-pentenyloxy)-2-cyclohexenone gave regioselectively, 6,6,10,10-tetramethyl-2-oxatricyclo[5.4.0.01,5]undecan-8-one, while, that of 5,5-dimethyl-3-[(3-methylcyclohexenyl)methoxy]-2-cyclohexenone afforded, regio- and stereoselectively, 1,5,5-trimethyl-8-oxatetracyclo[8.3.1.02,7.01,5]tetradecan-3-one.
辐照 5,5-二甲基-3-(4-甲基-3-
戊烯氧基)-2-
环己烯酮,可选择性地得到 6,6,10,10-四甲基-2-氧杂
三环[5.4.0.01,5]
十一烷-8-酮,而 5,5-二甲基-3-[(3-甲基
环己烯基)甲氧基]-2-
环己烯酮则可获得 1,5,5-三甲基-8-氧杂四环[8.3.1.02,7.01,5]
十四烷-3-酮。