Substituent effects on the efficiencies and regioselectivities of the di-π-methane rearrangement of vinyl-substituted bicyclic systems
作者:Helfried Hemetsberger、Matthias Nobbe
DOI:10.1016/s0040-4020(01)85094-8
日期:1988.1
- which were mono- or disubstituted at the vinyl moiety were synthesized. The substituent effects on the efficiencies and regioselectivities of the di-π-methane rearrangement were studied with the results: 1) The dihydrobenzobarrelene system rearranges less efficiently than the 7,7-benzonorbornadiene system. 2) The effect of the substituents on the efficiencies is more pronounced in the less efficient
Dihydrobenzobarralenes -和7,7- dimethylbenzonorbornadienes -合成了在乙烯基部分被单或双取代的化合物。研究了取代基对二-π-甲烷重排效率和区域选择性的影响,结果表明:1)二氢苯并三氢戊烯烯系统的重排效率低于7,7-苯并降冰片二烯系统。2)在效率较低的二氢苯并barrelene系统中,取代基对效率的影响更为明显。3)如果取代基的自由基稳定作用较大,则效率较高。但是,取代基提高体系间穿越至起始材料基态的速率的作用降低了效率。4)通过取代基的自由基稳定作用控制区域选择性。5)在双取代系统中,第二个取代基有助于提高效率。