Electrophilic Aromatic Substitutions of Aryltrifluoroborates with Retention of the BF<sub>3</sub><sup>–</sup> Group: Quantification of the Activating and Directing Effects of the Trifluoroborate Group
contrast to common belief, substitutions at CH positions are often faster than ipso-substitutions of the BF3K group, because BF3K activates the position attached to boron by a factor of 10(3)-10(4) while adjacent CH positions are activated by factors of 10(5)-10(6). Several reactions that have previously been interpreted as ipso-substitutions actually proceed via initial substitution at a vicinal or remote
A convenient and practical method for the synthesis of unsymmetrical triarylmethanes was demonstrated through a one-pot three-component double Friedel–Crafts reaction of various aliphatic, aromatic, or heteroaromatic aldehydes with N,N-dialkylanilines and indoles by using a Brønstedacidicionicliquid as the catalyst. This method was successfully applied under metal- and solvent-free conditions at
通过使用布朗斯台德酸性离子液体,各种脂肪族、芳香族或杂芳香族醛与N , N - 二烷基苯胺和吲哚的一锅三组分双傅克反应,证明了一种方便实用的合成不对称三芳基甲烷的方法作为催化剂。该方法在 80 °C 的无金属和无溶剂条件下成功应用,从广泛的底物中以中等至高产率提供了相应的不对称三芳基甲烷产物。此外,通过定量NMR分析研究了该反应的机理。
Fischer,O., Justus Liebigs Annalen der Chemie, 1881, vol. 206, p. 141
作者:Fischer,O.
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Renshaw; Naylor, Journal of the American Chemical Society, 1922, vol. 44, p. 864
作者:Renshaw、Naylor
DOI:——
日期:——
Shanmuga; Varma, Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 2001, vol. 40, # 12, p. 1258 - 1263