B(C<sub>6</sub>F<sub>5</sub>)<sub>3</sub> catalyzed direct nucleophilic substitution of benzylic alcohols: an effective method of constructing C–O, C–S and C–C bonds from benzylic alcohols
作者:Shan-Shui Meng、Qian Wang、Gong-Bin Huang、Li-Rong Lin、Jun-Ling Zhao、Albert S. C. Chan
DOI:10.1039/c8ra05811c
日期:——
An efficient and general method of nucleophilic substitution of benzylicalcohols catalyzed by non-metallic Lewis acid B(C6F5)3 was developed. The reaction could be carried out under mild conditions and more than 35 examples of ethers, thioethers and triarylmethanes were constructed in high yields. Some bioactive organic molecules were synthesized directly using the methods.
开发了一种由非金属路易斯酸B(C 6 F 5 ) 3催化的苯甲醇亲核取代的高效通用方法。该反应可以在温和的条件下进行,并且以高产率构建了超过 35 个醚、硫醚和三芳基甲烷的实例。使用该方法直接合成了一些生物活性有机分子。
B(C<sub>6</sub>F<sub>5</sub>)<sub>3</sub> catalysed reduction of para-quinone methides and fuchsones to access unsymmetrical diaryl- and triarylmethanes: elaboration to beclobrate
作者:Sriram Mahesh、Ramasamy Vijaya Anand
DOI:10.1039/c7ob02007d
日期:——
A mild and efficient method for the synthesis of unsymmetrical diaryl- and triarylmethanes through a B(C6F5)3 catalyzed reduction of para-quinone methides and fuchsones respectively, using the Hantzsch ester as a reducing source has been developed. Detailed mechanistic investigations revealed that the reaction actually proceeds through a Lewis acid–base pair complex derived from B(C6F5)3 and the Hantzsch
已开发出一种温和有效的方法,该方法通过使用Hantzsch酯作为还原源,通过B(C 6 F 5)3分别催化对苯醌甲基化物和丁二酮的还原反应,合成不对称的二芳基甲烷和三芳基甲烷。详细的机械研究表明,该反应实际上是通过衍生自B(C 6 F 5)3和汉茨(Hantzsch)酯的路易斯酸-碱对络合物进行的。
Photoinduced Reactions. XXXIII. Photochemical Reaction of a<i>para</i>-Quinone Methide
作者:Teruo Matsuura、Katsuyuki Ogura
DOI:10.1246/bcsj.42.2970
日期:1969.10
The photochemistry of a quinone methide (Ia) was investigated. Ia was unchanged on photolysis of an alcoholic solution (0.0064 m) with a high-pressure mercury lamp (Pyrex filter). However irradiation of a highly dilute solution of Ia or a sensitized reaction (acetophenone) gave an alcohol adduct (IIe in methanol and IIf in isopropyl alcohol) which might be formed via triplet excited state(s) of Ia. The methanol adduct IIe was also formed by the irradiation of Ia in methanol with a low-pressure mercury lamp through quartz. In this case the formation of He appears to be initiated by photochemical decomposition of methanol.
研究了一种醌甲醚(Ia)的光化学作用。用高压汞灯(Pyrex 过滤器)对酒精溶液(0.0064 m)进行光解时,Ia 保持不变。然而,照射 Ia 的高稀释溶液或敏化反应(苯乙酮)会产生醇加合物(甲醇中的 IIe 和异丙醇中的 IIf),这可能是通过 Ia 的三重激发态形成的。用低压汞灯通过石英照射甲醇中的 Ia,也会产生甲醇加合物 IIe。在这种情况下,He 的形成似乎是由甲醇的光化学分解开始的。