The photochemical cyclodimerisation of cycloheptene and cyclooctene has been studied under irradiation at 254 nm, using copper(I) triflate as catalyst. Two cycloheptene dimers cis-anti-cis- and trans-syn-trans-tricyclo [7.5.0.02,8] tetradecane and five cyclooctene dimers (all stereoisomeric tricyclo [8.6.0.02,9] hexadecanes) have been obtained. The 1H and 13C NMR spectra of the cyclooctene dimers show
使用
三氟甲磺酸铜(I)作为
催化剂,在254 nm的辐射下研究了
环庚烯和环
辛烯的光
化学环二聚反应。已获得两个
环庚烯二聚体顺-反-顺-和反-顺-反-
三环[7.5.0.0 2,8 ]
十四烷和五个环
辛烯二聚体(所有立体异构体
三环[8.6.0.0 2,9 ]
十六烷)。环
辛烯二聚体的1 H和13 C NMR光谱显示,由于
环丁烷环的褶皱,
环丁基氢的高场位移(从2.4到1 ppm)和
环丁基碳共振的低场位移。随着环褶皱的增加,它们的GC保留时间减少。