Biphenyl-2-ols undergo regioselectivemono- and diarylation upon a treatment with aryl iodides in the presence of a palladium catalyst in DMF using Cs2CO3 as a base to produce 1,1′ : 2′,1″-terphenyl-2-ol and 2′,6′-diphenylbiphenyl-2-ol and their derivatives. The reaction of 1-naphthol selectively occurs at its 8-position to give 8-aryl-1-naphthols. In the reaction of 2-naphthol with aryl bromides, diarylated
Decarboxylative 1,2-rearrangement of cyclic carbonates promoted by Lewis acid
作者:Yoichi Dokai、Kodai Saito、Tohru Yamada
DOI:10.1039/d2cc03024a
日期:——
A Lewis acid-mediated decarboxylative 1,2-rearrangement reaction of cyclic carbonates was developed. The selectivity of the migration of cyclic carbonates was opposite to that of the corresponding 1,2-diols under the same reaction conditions.
An effective synthetic approach for various 1,2,2-triarylethanones from triaryl substituted alkenes has been developed via an electrochemical Wacker-type oxygenation with O2 as the sole oxygen source. It presents the first instance of the Wacker-type oxidation expanding its substrate scope to trisubstituted alkenes. The approach is transition-metal-free, compatible with various functional groups, and
通过以 O 2作为唯一氧源的电化学瓦克型氧化,开发了一种从三芳基取代的烯烃中有效合成各种 1,2,2-三芳基乙酮的方法。它提出了瓦克型氧化将其底物范围扩展到三取代烯烃的第一个实例。该方法不含过渡金属,与各种官能团相容,并且可以在温和的条件下进行,从而获得令人满意的产率。机械实验表明 C O 键的形成是通过阳离子碳物质和超氧自由基之间的反应发生的,其中涉及富电子取代基的 1,2-位移。
71. The elimination of carbon monoxide from acid derivatives. Part I. Kinetic measurements with some diarylacetyl chlorides
作者:Michael E. Grundy、Wei-Hwa Hsü、Eugene Rothstein
DOI:10.1039/jr9600000372
日期:——
Kinetics of the base-catalyzed decomposition of .alpha.-hydroperoxy ketones