Synthesis of Polyfunctionalized Triaryllanthanum Reagents by Using Ph<sub>3</sub>
La and Related Species as Exchange Reagents
作者:Andreas D. Benischke、Lucile Anthore-Dalion、Fabien Kohl、Paul Knochel
DOI:10.1002/chem.201801527
日期:2018.8.1
Ph3La⋅5 LiCl and the related (m‐xylyl)3La⋅5 LiCl were used as Hal/La exchange reagents (Hal=Br, I) for the preparation of various triaryl‐ and triheteroaryl‐lanthanum derivatives. These new exchange reagents are compatible with isoquinolines and some functional groups such as a nitrile or an ester. The reactivity of the resulting lanthanum compounds towards electrophiles, such as ketones, aldehydes
A new palladium-catalyzed cross-coupling reaction between arylboronic acids and mixed anhydrides, generated in situ from carboxylic acids and pivalic anhydride, is presented. Optimization of the new catalyst and the reaction conditions led to the development of a convenient one-pot ketone synthesis directly from carboxylic and boronic acids in the presence of different (phosphane)palladium complexes
FLUORINATED-AROMATIC SULFONIC ACID CATALYST, PROCESS FOR ITS PRODUCTION, AND ITS USE
申请人:MITSUI PETROCHEMICAL INDUSTRIES, LTD.
公开号:EP0426846A1
公开(公告)日:1991-05-15
The invention provides a fluorinated aromatic sulfonic acid catalyst in which sulfonic acid groups and aryl groups substituted by fluorine atoms or fluoroalkyl groups are bound to a matrix selected from the group consisting of polysiloxane and inorganic base material. This catalyst can be produced by introducing sulfonic acid groups and aryl groups substituted by fluorine atoms or fluoroalkyl groups into the above-described matrix. This catalyst is used in various acid-catalyzed reactions such as esterification, acylation, nitration, alkylation, etherification, etc., particularly acid-catalyzed reactions in the presence of water to show a high acid catalysis activity. In addition, since this catalyst is solid, its handling is so easy that recovery and reuse thereof is easy.