Studies on organic fluorine compounds. Part 26. Diels–Alder reaction of hexakis(trifluoromethyl)bicyclo[2.2.0]hexa-2,5-diene
作者:Yoshiro Kobayashi、Takaharu Nakano、Ryoji Takahashi、Itsumaro Kumadaki
DOI:10.1039/p19790002253
日期:——
Hexakis(trifluoromethyl)bicyclo[2.2.0]hexa-2, 5-diene (1). which had been reported to be unreactive with dienes, was heated with dienes at 140° to give Diels–Alder adducts in good yields. The temperature must be strictly maintained, since starting materials were recovered at lower temperature, and isomerization of (1) occurred at higher temperature. Reaction of (1) with cyclohexa-1, 3-diene gave benzene
六(三氟甲基)双环[2.2.0] hexa-2,5-二烯(1)。据报道,二烯与二烯不发生反应,将其与二烯在140°C加热,可得到高产率的Diels-Alder加合物。由于起始原料是在较低的温度下回收的,而(1)的异构化是在较高的温度下进行的,因此必须严格保持温度。(1)与环己-1,3-二烯的反应可能通过烯反应得到苯和(1)的3,4-二氢异构体。