Synthesis and properties of dihydrocyclobuta[e]pyrene and tetrahydrodicyclobuta[e,l]pyrene
摘要:
Dihydrocyclobuta[e]pyrene and tetrahydrodicyclobuta[e,l]pyrene were prepared by the sequence of photo-cycloaddition of stryene derivatives, transannulation, and aromatization through lithiation. They reacted with dienophiles at 180-degrees-C to afford Diels-Alder adducts in excellent yields.
Intramolecular [2+2] Photocycloaddition. 14. Cycloreversion of Cyclophanes Possessing a Cyclobutane Ring at Their Tether
作者:Jun Nishimura、Yasuhiro Wada、Yukari Sano
DOI:10.1246/bcsj.65.618
日期:1992.2
Thermal cycloreversion of ten cyclophanes possessing a cyclobutane ring at their tether was examined. The rates were affected not only by their strain but also by their structural characteristics, such as meta- or para-configuration. The relative rate difference covered a range of the order of 106.