Nuclear Versus Side-Chain Bromination of 4-Methoxy Toluene by an Electrochemical Method
作者:K. Kulangiappar、M. Anbukulandainathan、T. Raju
DOI:10.1080/00397911.2014.905599
日期:2014.9.2
Abstract The electrochemical bromination of 4-methoxy toluene by two-phase electrolysis yields 3-bromo 4-methoxy toluene at first, which subsequently undergoes side-chain bromination to give 3-bromo 4-methoxy benzyl bromide as a final product in 86% yield. The two-phase electrolysis consists of 25–50% NaBr as aqueous electrolyte and CHCl3 containing aromatic compound as organic phase. The reaction
The asymmetric coupling of various phenol or aniline derivatives with bulky aryllead triacetates was thoroughly investigated using optically active amines, including strychnine and brucine. We found that conformationally restricted tertiary amines, as well as lithium aryloxides and molecular sieves, are essential for accelerating the rate of phenol coupling. Consequently, the reaction can be carried
Restricted Rotation Involving the Tetrahedral Carbon. XLIII. Buttressing Effect on Rotational Barriers in Bromine-substituted 9-(2-Methoxy-4,6-dimethylphenyl)fluorenes
作者:Masahiro Aoki、Mikio Nakamura、Michinori Oki
DOI:10.1246/bcsj.55.2512
日期:1982.8
or two bromo groups on the phenyl ring were prepared and the buttressingeffect on the rotational barrier about the C9–Cph bond were investigated. The free energies of activation for rotation were 26.5, 25.9, and 27.2 kcal/mol at 56 °C for 3-bromo, 5-bromo, and 3,5-dibromo compounds, respectively. The buttressingeffect was enhanced when the bromo group was next to the methoxyl group relative to that
2,6-Bis(2-alkylphenyl)-3,5-dimethylphenol as a New Chiral Phenol with <i>C</i><sub>2</sub>-Symmetry. Application to the Asymmetric Alkylation of Aldehydes