Deselenation of diselenacyclophanes —a new synthetic method of [2.2]cyclophanes—
作者:Hiroyuki Higuchi、Soichi Misumi
DOI:10.1016/s0040-4039(00)85897-9
日期:1982.1
diselena[3.3]cyclophanes were prepared by coupling of bisselenocyanates and bis(bromomethyl)benzenes in good yields. The benzyne Stevens rearrangement-Raney Ni hydrogenolysis method gave good yields of double- and triple-layered cyclophanes from the diselenides, though the flash pyrolysis method gave them in low yields.
Several cyclophanes were prepared by photodeselenation of diselena[3.3]cyclophanes with hexamethylphosphorus triamide in excellent yields, compared with the other chalcogen-atom extrusion methods.
与其他硫属元素原子挤出法相比,通过用六甲基三磷化磷对二硒代[3.3]环烷进行光脱硒制备了数个环烷。
Layered Compounds. XXXV. Syntheses of Triple-layered Metaparacyclophanes
Six triple-layered [2.2]metaparacyclophanes have been prepared using general synthetic methods such as the Stevens rearrangement-Raney nickel desulfurization method, pyrolysis of bissulfone, and photo-induced desulfurization. The pyrolysis of bissulfone has turned out to be the most useful and convenient method for preparation of the intermediate double-layered [2.2]metaparacyclophanes because of simple experimental process and excellent yields. The unexpected formation of compound 9 during the photo-induced desulfurization of 7 was explained by a unique skeletal rearrangement of the intermediate 8 on irradiation.
multilayered [2.2]paracyclophanes to [2.2]metaparacyclophanes with several Friedel-Crafts acids have been studied. Two types of rearrangements depending on the catalyst were observed. Treatment of triple-layered paracyclophane(8) with AlCl3–HCl gave mainly triple-layered metaparacyclophane(9), which was derived by migration of one of the ethylene bridges attached to the outer benzene rings. Treatment