Anodic oxidation of cycloheptatrienes has been found to be one of the most powerful key tools for the preparation of a variety of non-benzenoidaromaticcompounds such as tropylium salts, tropones, tropolones, 2H-cyclohepta[b]furan-2-ones, and azulenes.
The Sensitized Photooxidation of Methoxycycloheptatrienes. The Synthesis of α-, β-, and γ-Tropolones
作者:Morio Yagihara、Yoshio Kitahara、Toyonobu Asao
DOI:10.1246/bcsj.53.236
日期:1980.1
The sensitized photooxidation of 7-methoxycycloheptatriene (7-methoxytropilidene) afforded [4+2] cycloadduct (2), tropone, benzaldehyde and their 2-methoxy derivatives. Thermal isomerization of 2 followed by the treatment with alumina yielded 4-methoxytropone. The photooxidation of 1-methoxytropilidene gave 4-hydroxytropone and o-methoxybenzaldehyde, and the photooxidation of 3-methoxytropilidene followed
compound to a tropylium salt, by the anodic oxidation of CHT in methanol. The further anodic oxidation of 3-MCHT prepared from 7-MCHT has been found to be an effective method of synthesis of tropone and tropolone.
Conductive Salts of Tropylium Ions with Tetracyanoquinodimethan Anion Radical (TCNQ<sup>\ewdot</sup>) and Bisthiadiazolotetracyanoquinodimethan Anion Radical (BTDA–TCNQ<sup>\ewdot</sup>)
Tropylium ions have been found to be good cations for forming highly conductive salts of TCNQ\ewdot. Tropylium ions with different reduction potentials were prepared. The first reduction potentials which are correlated with the substituent constants σp+ control the formation of the salts. The cations with higher reduction potentials underwent a reaction with TCNQ\ewdot to give neutral TCNQ and coupling