C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
C07C 69/76 (2006.01) C07C 67/11 (2006.01) C07C 227/18 (2006.01) C07C 229/52 (2006.01) C07C 319/20 (2006.01) C07C 323/62 (2006.01)
Patent
CA 2182350
Process for the preparation of esters of aromatic carboxylic acids The present invention relates to a process for the preparation of compounds of the formula (1) R1R2R3R4R5ArCOOR (1) in which R1, R2, R3, R4 and R5 are identical or different and are hydrogen, a halogen, an alkyl or alkoxy group having 1 to 6 carbon atoms, OR, NHR, NR2, SR or COOR, R being an alkyl radical having 1 to 4 carbon atoms, Ar is an aryl radical having 6 to 12 carbon atoms and the radical R identified in formula (1) has the above meaning, by reacting a compound of the formula (2) R1R2R3R4R5ArCOOH (2) in which R1, R2, R3, R4 and R5 are identical or different and are hydrogen, a halogen, an alkyl or alkoxy group having 1 to 6 carbon atoms, OH, NH2, NHR, SH or COOH and Ar has the same meaning as in formula (1), with a sulfate of the formula (RO)2SO2, in which R has the above meaning, at a pH from 5 to 12 in the presence of a water-insoluble tertiary amine and water at a temperature from 10 to 120°C in the presence or absence of a water-insoluble solvent and with addition of a base.
Papenfuhs Theodor
Pfirmann Ralf
Fetherstonhaugh & Co.
Hoechst Aktiengesellschaft
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