INTRAMOLECULAR PHOTOCYCLIZATION OF OMEGA,OMEGA-DIPHENYL-(OMEGA-1)-ALKEN-1-OLS BY AN EXCIPLEX QUENCHING MECHANISM
INTRAMOLECULAR PHOTOCYCLIZATION OF OMEGA,OMEGA-DIPHENYL-(OMEGA-1)-ALKEN-1-OLS BY AN EXCIPLEX QUENCHING MECHANISM
复制标题
DOI：
10.1002/anie.199421131
复制
发表时间：
1994-11-02
期刊：
影响因子：
--
通讯作者：
OTSUJI, Y
中科院分区：
文献类型：
--
作者：
MIZUNO, K;TAMAI, T;OTSUJI, Y
4a：22%。 4b：痕量，4c：1%立体选择性，分别得到顺式和正式4-取代的2-(二苯基甲基)四氢吡喃6ac和7ac。比例约为 4:1。[“顺式异构体比例受反应温度、溶剂和取代基影响很小。”]苯中形成环化产物 2、6 和 7 的量子产率比乙腈中高 5 至 10 倍。
4a: 22%. 4b: trace, 4c: 1% stereoselective and gave the cis and truiis 4-substituted 2-(diphenylmethy1) tetrahydropyrans 6 ac and 7 ac, respectively. in about a 4: 1 ratio.[" The cislrrrins isomer ratios were little affected by the reaction temperature, solvent, and sub-stituents."'] The quantum yields for the formation of the cyclized products 2, 6, and 7 in benzene were five to ten times higher than those in acetonitrile.