Process for preparing high-purity, halogen-free...

Details Process for preparing high-purity, halogen-free... Process for preparing high-purity, halogen-free...

C - Chemistry, Metallurgy

07

C

C07C 45/43 (2006.01) C07C 47/544 (2006.01)

Patent

CA 2550638

Improved process for preparing high-purity, halogen-free o-phthalaldehyde, in which a) tetrahalo-o-xylene is hydrolyzed at a temperature of 155-160°C and a pressure of from 2 to 5 bar, where appropriate in the presence of a phase-transfer catalyst, to o-phthalaldehyde, which b) is converted in an acidic alcoholic solution at a temperature of from 0 to the reflux temperature into the corresponding dialkoxyphthalane and, subsequently, c) an acetal cleavage is effected by acid hydrolysis at a pH > 1.5 to pH 7, resulting in high-purity, halogen-free o-phthalaldehyde.

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