Process for preparing high-purity, halogen-free o-phthaladehyde

Details Process for preparing high-purity, halogen-free o-phthaladehyde Process for preparing high-purity, halogen-free o-phthaladehyde

2006-06-27

2010-12-28

Gakh, Yelena G (Department: 1797)

Chemistry: analytical and immunological testing

Oxygen containing

Carbonyl, ether, aldehyde or ketone containing

C568S425000, C568S430000, C568S345000

Reexamination Certificate

active

07858381

ABSTRACT:
Improved process for preparing high-purity, halogen-free o-phthalaldehyde, in whicha) 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, whichb) 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.

REFERENCES:
patent: 5107032 (1992-04-01), Erb et al.
patent: 5874637 (1999-02-01), Giselbrecht et al.
patent: 0 003 230 (1979-08-01), None
patent: 0 839 789 (1998-05-01), None
HeiLongJiang Medical Journal, vol. 11, No. 1, 1998, p. 6 (translation).

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