Dearomatization‐Rearomatization Strategy for
<i>ortho</i>
‐Selective Alkylation of Phenols with Primary Alcohols
作者:Jianjin Yu、Chao‐Jun Li、Huiying Zeng
DOI:10.1002/anie.202010845
日期:2021.2.19
the synthesis of site‐specificallysubstituted phenols is challenging, and thus the development of new methods for this purpose would be highly desirable. Reported here is a protocol for palladium‐catalyzed ortho‐selective alkylation reactions of phenols with primary alcohols by a dearomatization‐rearomatization strategy, with water as the sole by‐product. Various substituted phenols and primary alcohols
Dehydrative C–H Alkylation and Alkenylation of Phenols with Alcohols: Expedient Synthesis for Substituted Phenols and Benzofurans
作者:Dong-Hwan Lee、Ki-Hyeok Kwon、Chae S. Yi
DOI:10.1021/ja302710v
日期:2012.5.2
well-defined cationic Ru-H complex catalyzes the dehydrative C-H alkylation reaction of phenols with alcohols to form ortho-substituted phenol products. Benzofuran derivatives are efficiently synthesized from the dehydrative C-H alkenylation and annulation reaction of phenols with 1,2-diols. The catalytic C-H coupling method employs cheaply available phenols and alcohols, exhibits a broad substrate scope, tolerates
Catalytic Tandem and One-Pot Dehydrogenation–Alkylation and −Insertion Reactions of Saturated Hydrocarbons with Alcohols and Alkenes
作者:Junghwa Kim、Nuwan Pannilawithana、Chae S. Yi
DOI:10.1021/acscatal.6b02186
日期:2016.12.2
reaction of saturated hydrocarbon substrates with alcohols to form the alkyl-substituted alkene and arene products. The analogous one-pot dehydrogenation–insertion of saturated ketones with alkenes and dienes directly yielded synthetically useful 2-alkylphenol and benzopyran products in a highly regio- and stereoselective manner without forming any wasteful byproducts.
Palladium-catalyzed aerobic synthesis of <i>ortho</i>-substituted phenols from cyclohexanones and primary alcohols
作者:Huiying Zeng、Jianjin Yu、Chao-Jun Li
DOI:10.1039/c9cc09347h
日期:——
precursors of chemical products, synthesis of site-specific substituted phenols is highly desirable and a significant challenge. An aerobic palladium-catalyzed site-specific synthesis of ortho-substituted phenols from cyclohexanones and primary alcohols via an oxidation/aldol/dehydration/aromatization process has been developed. Various substituted cyclohexanones and primary alcohols are successfully transformed
Radiation sensitive thermally developable imaging elements comprise:
(a) photosensitive silver halide,
(b) light insensitive silver salt oxidizing agent,
(c) reducing agent for silver ions, and
(d) an antifoggant or speed enhancing compound comprising iodophthalazinone compounds.
The antifoggants are effective in reducing spurious background image densities.