Method for producing aqueous ortho-phthalaldehyde solutions

Details Method for producing aqueous ortho-phthalaldehyde solutions Method for producing aqueous ortho-phthalaldehyde solutions

2008-07-22

2008-07-22

Witherspoon, Sikarl A (Department: 1621)

Organic compounds -- part of the class 532-570 series

Organic compounds

Oxygen containing

C568S438000

Reexamination Certificate

active

07402708

ABSTRACT:
A method for producing aqueous ortho-phthalaldehyde solutions which comprises introducing an acetal of the o-phthalaldehyde into water and subsequently setting a pH <7 by adding an acid, whereupon, then at a temperature between 10° C. and 90° C., the acetal is converted into the o-phthalaldehyde by eliminating the corresponding alcohol, and also use of OPA acetals for producing these solutions.

REFERENCES:
patent: 5872153 (1999-02-01), Giselbrecht et al.
patent: 6486358 (2002-11-01), Giselbrecht et al.

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