Easy synthesis of 2,4-dialkyl substituted phenols and anisoles from p-bensoquinone
摘要:
The reaction of p-benzoquinone (1) with several organolithium compounds (methyl-, ethyl-, n-butyl, phenyllithium) leads directly, after acid hydrolysis, to the corresponding 2,4-dialkylphenols 4a-d, resulting from a rearrangement/aromatization process of the corresponding intermediate diols 3. The use of two different alkyllithium reagents leads to the mixed products 4e.f. Alternatively, the same results are obtained treating the crude isolated diols 3 with a catalytic amount of concentrated sulfuric acid. Applying this last methodology to the diethers 2, 2,4-dialkylanisoles 8 are obtained. A possible mechanism is proposed.
Syntheses, structures and catalytic activity for Friedel-Crafts reactions of substituted indenyl rhenium carbonyl complexes
作者:Zhihong Ma、Xinli Zhang、Hong Wang、Zhangang Han、Xuezhong Zheng、Jin Lin
DOI:10.1080/00958972.2016.1276573
日期:2017.2.16
Re2(CO)10 in decalin. The molecular structures of 9, 10, 12, and 13 were determined by X-ray diffraction analysis. These four crystals have similar molecular structures of the mononuclear carbonyl complex. In each of these molecules, Re is η5-coordinated to the five-membered ring of the indenyl group. Complexes 8–14 have catalytic activity for Friedel-Crafts reactions of aromatic compounds with a variety
Easy synthesis of 2,4-dialkyl substituted phenols and anisoles from p-bensoquinone
作者:Francisco Alonso、Miguel Yus
DOI:10.1016/s0040-4020(01)88530-6
日期:1992.3
The reaction of p-benzoquinone (1) with several organolithium compounds (methyl-, ethyl-, n-butyl, phenyllithium) leads directly, after acid hydrolysis, to the corresponding 2,4-dialkylphenols 4a-d, resulting from a rearrangement/aromatization process of the corresponding intermediate diols 3. The use of two different alkyllithium reagents leads to the mixed products 4e.f. Alternatively, the same results are obtained treating the crude isolated diols 3 with a catalytic amount of concentrated sulfuric acid. Applying this last methodology to the diethers 2, 2,4-dialkylanisoles 8 are obtained. A possible mechanism is proposed.