Process for the preparation of 2-nitrobenzaldehyde and...

Details Process for the preparation of 2-nitrobenzaldehyde and... Process for the preparation of 2-nitrobenzaldehyde and...

C - Chemistry, Metallurgy

07

C

260/566.7

C07C 205/56 (2006.01) C07C 205/11 (2006.01)

Patent

CA 1051032

PROCESS FOR THE PREPARATION OF 2-NITROBENZALDEHYDE AND INTERMEDIATES THEREFOR Abstract 2-Nitrobenzaldehyde, a valuable chemical inter- mediate, is produced by treating the alkali metal salt of a 2-nitrophenylpyruvic acid with an alkali metal hypochlorite in an aqueous medium to produce the corresponding 2-nitro- benzylidene chloride which, upon hydrolysis, yields the desired aldehyde. The 2-nitrophenylpyruvic acid starting material is advantageously prepared through the reaction of a 2-nitrotoluene and a diester of oxalic acid in the pre- sence of an alkali metal alcoholate and can be used directly in the subsequent hypochlorite reaction without isolation. The process is industrially attractive in terms of the overall yield, the availability of starting materials, and the ease of the manipulative steps involved.

221949

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