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US 5,107,032 AGranted
Process for the preparation of o-phthalaldehydes
AssigneeNoramco, Inc.
InventorsDudley K. Erb, Janet E. Goldstein
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Abstract
A process for the preparation of o-phthalaldehydes is disclosed comprising the steps of (1) halogenating an o-xylene and (2) hydrolysis of the resulting tetrahalogeno-o-xylene.
Claims3
A process for the preparation of o-phthalaldehydes of the formula:
- ##STR8## wherein R is selected from the group consisting of H, Cl, Br and Co.sub.2 H;
- comprising the steps of
- a) halogenating an o-xylene of the formula ##STR9## to form .alpha.,.alpha.,.alpha.',.alpha.'-tetrahalogeno-o-xylene of the formula ##STR10## wherein X is selected from the group of Cl, Br and I;
- and b) hydrolyzing the .alpha.,.alpha.,.alpha.',.alpha.'-tetrahalogeno-o-xylene wherein the hydroylis is carried out in a short chain alkyl acid in the presence of alkali and wherein the temperature is from about 90.degree. to 146.degree. C. and the pressure is from about 0 to 40 PSI.
1 more element
Dependencies are inferred from the claim text.