C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
C07C 51/60 (2006.01) C07C 63/10 (2006.01)
Patent
CA 2393515
The invention relates to a method for producing o-chloromethyl benzoic acid chlorides of formula (I), in which R1 to R4 can be the same or different and represent hydrogen C1-C4 alkyl, halogen or trifluoromethyl, by reacting benzo- condensed lactones of formula (II), in which R1 to R4 have the above-mentioned meaning, with thionyl chloride. The inventive method is characterized in that the reaction is carried out in the presence of catalytic quantities of a Lewis acid and in the presence of catalytic quantities of a phosphine derivative.
L'invention concerne un procédé de fabrication de chlorures d'acide o-chlorométhylbenzoïque de formule (I), dans laquelle R?1¿-R?4¿ peuvent être identiques ou différents et désignent l'hydrogène, un alkyle en C¿1?-C¿4?, un halogène ou un trifluorométhyle, consistant à faire réagir des lactones benzo-condensées de formule (II), dans laquelle R?1¿-R?4¿ ont les significations précitées, avec du chlorure de thionyle, caractérisé en ce qu'on effectue la réaction en présence de quantités catalytiques d'un acide de Lewis et de quantités catalytiques d'un dérivé de phosphine.
Gotz Norbert
Gotz Roland
Henkelmann Jochem
Keil Michael
Stamm Armin
Basf Aktiengesellschaft
Robic
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