Organic compounds -- part of the class 532-570 series – Organic compounds – Carboxylic halides
Patent
1990-12-06
1992-07-14
Killos, Paul J.
Organic compounds -- part of the class 532-570 series
Organic compounds
Carboxylic halides
C07C 5109
Patent
active
051304783
ABSTRACT:
The invention relates to a process for the preparation of chlorides of chlorinated carboxylic acids of formula ##STR1## in which R.sup.2 denotes the radical (CH.sub.2).sub.n, n being an integer from 2 to 4, or the radical --CH.sub.2 --C(C.sub.6 H.sub.5).sub.2 -- and R.sup.1 denotes a hydrogen atom or an alkyl radical containing from 1 to 4 carbon atoms, which consists in reacting the lactones of formula ##STR2## in which R.sup.1 and R.sup.2 have the above meanings, with phosgene at a temperature of 90.degree. to 180.degree. C., while employing as catalysts trisubstituted phosphine oxides or sulphides.
The process according to the invention makes it possible to obtain chlorides of chlorinated carboxylic acids of high purity which exhibit an excellent stability to light and to heat and which are very useful as synthesis intermediates.
REFERENCES:
patent: 2778852 (1957-01-01), Adam et al.
patent: 4764310 (1988-08-01), Buysch
Gauthier Patricia P.
Le Moult Michel M.
Rochelle Claude
Senet Jean-Pierre G.
Killos Paul J.
Societe Nationale de Poudres et Explosifs
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