[3.2]paracyclophane (10), [4.2]paracyclophane (14), [4.3]paracyclophane (19) as well as several derivatives of these compounds – among others the bromides 25, the ester 31, the diesters 40–43 – are described using well-established methods of cyclophane chemistry (ring-closure reactions leading to thiacyclophanes, ring contraction by sulfone pyrolysis). The parent systems and their derivatives are now
Layered Compounds. LXII. Triple-layered [<i>m</i>.<i>m</i>][<i>n</i>.<i>n</i>]Paracyclophanes: Syntheses and Spectra
作者:Tetsuo Otsubo、Takashi Kohda、Soichi Misumi
DOI:10.1246/bcsj.53.512
日期:1980.2
A series of the title cyclophanes (m, n=2–4) were synthesized by the thermal- and photo-desulfurization methods from dithia intermediates. Their absorption and emission spectra were measured to examine the transannular electronic interaction. The absorption spectra of the title compounds and their TCNE complexes gave the same order of the interaction as seen in the case of double-layered system: [2.2]>[3.3]>[4.4] in neutral state and [3.3]>[2.2]>[4.4] in CT state. The emission spectra are discussed in terms of the existence of excited trimer.
[3.3]Orthoparacyclophane (1), [4.4]orthoparacyclophane (2), and [3.3]orthometacyclophane (3) were synthesized via the corresponding dithiacyclophanes 4, 5, and 6, resp., by sulfone pyrolysis. The conformations of 1-3 are discussed on the basis of H-1-NMR and the X-ray analysis of dithia[4.4]orthometa = cyclphane 4 for which a perpendicular arrangement of the two aromatic rings was found.
OTSUBO T.; KITASAWA M.; MISUMI S., BULL. CHEM. SOC. JAP., 1979, 52, NO 5, 1515-1520