Process for the preparation of alkylated aromatic carboxylic aci

Details Process for the preparation of alkylated aromatic carboxylic aci Process for the preparation of alkylated aromatic carboxylic aci

1995-10-11

1997-04-01

Killos, Paul J.

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

Organic compounds

Carboxylic acids and salts thereof

562861, C07C 5158

Patent

active

056167873

ABSTRACT:
The invention relates to a process for the preparation of polyalkylated aromatic carboxylic acids of formula I ##STR1## wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4 and R.sub.5 are each independently of one another hydrogen, C.sub.1 -C.sub.20 alkyl, halogen or C.sub.5 -C.sub.8 cycloalkyl, with the proviso that at least two of the substituents R.sub.1, R.sub.2, R.sub.3, R.sub.4 or R.sub.5 are alkyl and/or cycloalkyl, by reacting corresponding aromatic hydrocarbons with carbon dioxide, which reaction is carried out observing special ratios of temperature and pressure. The invention furthermore relates to a one-pot process for the preparation of the corresponding acyl halides.

REFERENCES:
patent: 1866717 (1932-07-01), Meyer et al.
patent: 3138626 (1964-06-01), Calfee
patent: 3520926 (1970-07-01), Bollag et al.
patent: 4730083 (1988-03-01), Pastor et al.
James F. Norris et al., Journal Amer. Chem. Soc., vol. 62, pp. 1428-1432 1940.
Hiroshi Sugimoto et al., Journal of Oranometallic Chem. Soc., 266, pp. C44-C46 (1984).
Friedel-Crafts and Related Reactions, George A. Olah, III, Part 2, Interscience Publishers, pp. 121-122 & 1269-1270, (1964).
Derw. Abst. 77512x/42 of CH 619,204 27 Sep. 1976.

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