Layered Compounds. LIX. Facile Syntheses and Spectral Properties of [3.3]Cyclophanes and Related Cyclophanes
作者:Tetsuo Otsubo、Masashi Kitasawa、Soichi Misumi
DOI:10.1246/bcsj.52.1515
日期:1979.5
of [3.3]cyclophanes via dithia[4.4]cyclophanes is presented. The spectra of a variety of cyclophanes were examined and compared to those of [2.2]analogues. It was concluded from the absorption spectra that the transannular π-π interactions of the cyclophanes were strongly dependent on both ring-to-ring distance and overlapping mode. From the emission spectra, it was described that cyclophanes of parallel
more layered. In the charge-transfer (CT) bands of the multilayered [3.3]MCPs with tetracyanoethylene (TCNE), the λmax gradually shifts to the longer wavelength region, but the extent of the shift is much smaller as the number of layers increases. In the multilayered [3.3]MCP-di- and tetraones, the anti-[3.3]MCP-dione moiety works as an insulator. Therefore, the CT interaction of the four- and five-layered
Cooperation of aryliminodimagnesium molecules: Deoxygenation of azoxyarenes by mono- and bifunctional reagents in comparison with that by phosphorus(III) reagents
proposed. This unfamiliar concept for reactions of magnesium reagents was studied further. Supporting evidence was obtained from the retarding effect of trimethylene chains of nitro [3.3] metacyclophanes and the derived azoxy [3.3] metacyclophanes and also from the effect of the length of bis-IDMg's central α,ω-polymethylenedioxy chain appropriate for azoxy deoxygenation. By comparison with deoxygenation
[3.3]Metacyclophane was synthesized by hydrolysis of tetraethyl [3.3]metacyclophane-2,2,11,11-tetracarboxylate (III), followed by decarboxylative chlorination and reduction. Compound III was obtained by the coupling reaction of m-bis(bromomethyl)benzene (I) and tetraethyl m-diethylbenzene-ω,ω,ω′,ω′ -tetracarboxylate (II) in the presence of sodium hydride as a base under high dilution conditions.
Two synthetic methods of [3.3]cyclophanes via dithia[4.4]cyclophanes are presented. Direct photodesulfurization method is generally successful except in the cases of metapara- and meta-cyclophanes which are prepared by pyrolytic method of bissulfone.