81358-66-9Relevant academic research and scientific papers
ETHER SYNTHESIS
-
Page/Page column 21, (2010/08/09)
The present invention relates to processes for preparing novel nano-copper catalyst system. The present invention also relates to manufacturing of 4-fluoro-3- phenoxy-benzaldehyde acetal employing novel nano-copper catalyst system.
Preparation of 3-bromo-4-fluorobenzaldehyde and its acetals
-
, (2008/06/13)
A process for the preparation of a 3-bromo-4-fluorobenzaldehyde acetal of the formula STR1 in which R1 is methyl or ethyl, which comprises reacting a 3-bromo-4-fluoro-benzoic acid halide with ammonia to form 3-bromo-4-fluoro-benzoic acid amide, dehydrating said amide to form 3-bromo-4-fluoro-benzonitrile, reacting the nitrile with formic acid in the presence of a catalyst at a temperature between about 0° and 150° C. to form 3-bromo-4-fluorobenzaldehyde, and reacting said aldehyde with R1 OH or a derivative thereof capable of forming an acetal. The amide and nitrile are new compounds. The acetals are known intermediates in the synthesis of pyrethroid-like insecticides.
