The One-electron Reduction of Carbonium Ions. VIII. The Reducibility of Hetero-substituted Tropylium Ions as Measured by the Competitive Reduction Method with Zinc Powder
作者:Kunio Okamoto、Koichi Komatsu、Osamu Sakaguchi
DOI:10.1246/bcsj.47.2431
日期:1974.10
CH3OCO-C7H6+ (35.7), NC-C7H6+ (163). The values of logkrel. for the t-C4H9−, H-, and C6H5-C7H6+ ions exhibit a good linear relationship with those of logk2 in the chromous-ion reduction. A linear correlation is also observed between logkrel. and the transition energy for the charge-transfer band of the respective cations, with pyrene as a donor. A plot of logkrel. against σp (for the ring substituent, X) gives
已经合成了一系列杂取代的托鎓盐(X-C7H6+·Y-),包括三种新化合物。它们在锌粉单电子还原中的相对反应性已通过使用竞争反应法确定,其反应性顺序如下:CH3O-C7H6+ (krel.=0.0295), t-C4H9-C7H6+ (0.146), CH3S-C7H6+ (0.255)、C7H7+ (1.00)、C6H5-C7H6+ (2.50)、(C6H5)3Si-C7H6+ (7.50)、Cl-C7H6+ (16.8)、CH3OCO-C7H6+、(35.16H6+)。logkrel 的值。对于 t-C4H9-、H- 和 C6H5-C7H6+ 离子,在铬离子还原中与 logk2 的那些表现出良好的线性关系。在 logkrel 之间也观察到线性相关性。以及相应阳离子的电荷转移带的跃迁能,芘作为供体。logkrel 的情节。对σp(对于环取代基,