A method for grinding silicon metalloid is claimed herein comprising grinding silicon metalloid in the presence of an effective amount of a grinding aid selected from groups consisting of carboxylic acids having at least 8 carbon atoms, alkali metal salts of carboxylic acids having at least 8 carbon atoms and polydiorganosiloxanes.
Synthesis of Aryl Ethers from Aromatic Carboxylic Acids
作者:Lukas Gooßen、Sukalyan Bhadra、Wojciech Dzik
DOI:10.1055/s-0033-1339470
日期:——
meta-substituted carboxylates are converted into para-substituted alkoxyarenes and vice versa. The combined processes provide a convenient synthetic entry to the important class of aromatic ethers from widely available carboxylicacids. A silver/copper bimetallic catalyst system promotes the decarboxylative Chan–Evans–Lam alkoxylation of ortho-substituted aromatic carboxylate salts with tetraalkyl orthosilicates
Synthesis of Aryl Ethers from Benzoates through Carboxylate-Directed CH-Activating Alkoxylation with Concomitant Protodecarboxylation
作者:Sukalyan Bhadra、Wojciech I. Dzik、Lukas J. Gooßen
DOI:10.1002/anie.201208755
日期:2013.3.4
copper/silver bimetallic catalyst system, aromatic carboxylate salts undergo ortho CH alkoxylation with concomitant loss of the carboxylate directing group in a protodecarboxylation step (see scheme, FG=functional group). This process provides a convenient synthetic access to the important class of aromatic ethersfrom widely available carboxylic acids.