Method for the preparation of 5-carboxyphthalide

Details Method for the preparation of 5-carboxyphthalide Method for the preparation of 5-carboxyphthalide

C - Chemistry, Metallurgy

07

D

C07D 307/88 (2006.01)

Patent

CA 2389379

5-carboxyphthalide is obtained with very high purity and in high yields by a convenient process comprising reaction of terephthalic acid represented by formula (II), with paraformaldehyde HO(CH2O)n H in oleum.

La présente invention concerne un procédé d'élaboration de 5-carboxyphtalure se distinguant par la pureté du produit, le rendement élevé et la commodité de mise en oeuvre. En l'occurrence, on part d'un acide téréphtalique représenté par la formule (II) que l'on fait réagir dans l'oléum avec un paraformaldéhyde en HO(CH2)nH.

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