Process for preparing phthaloyl chloride

Details Process for preparing phthaloyl chloride Process for preparing phthaloyl chloride

2006-12-26

2006-12-26

Zucker, Paul A. (Department: 1621)

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

Organic compounds

Carboxylic halides

Reexamination Certificate

active

07154003

ABSTRACT:
The invention relates to a novel process for preparing phthaloyl chloride (benzene-1,2-dicarbonyl chloride) by reacting phthalic anhydride with phosgene in the presence of a specific N,N-disubstituted formamide as a catalyst.

REFERENCES:
patent: 2051096 (1936-08-01), Mares
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patent: 3758570 (1973-09-01), Findelsen et al.
patent: 3810940 (1974-05-01), Hauser
patent: 4880576 (1989-11-01), Blank et al.
patent: 5623082 (1997-04-01), Decker et al.
patent: 6206819 (2001-03-01), Graves et al.
patent: 2004/022520 (2004-03-01), None
J. Am. Chem. Soc. 1937, vol. 59, pp. 206-208; “Phthalyl Chloride” L.P. Kyrides.
Can. J. Chem. 1970, 48, pp. 3566-3571; “Structure of a diazecine derivative from the condensation of phthaloyl chloride with enthylenediamine” S. Wolfe and S. Hasan Database CA ′Online! Chemical Abstracts Service, Columbus, Ohio, US.
“Carboxylic acid chlorides” XP002341528 gefunden im STN; Database accession No. 1982: 19845 *Zusammenfassung * & JP 56 103131 A2 (Mitsui Toatsu Chemicals, Inc., Japan) Aug. 18, 1981.

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