Process for the preparation of heterocyclic aldehydes

Details Process for the preparation of heterocyclic aldehydes Process for the preparation of heterocyclic aldehydes

C - Chemistry, Metallurgy

07

D

C07D 309/06 (2006.01) B01J 23/34 (2006.01) C07D 307/12 (2006.01) C07D 313/00 (2006.01)

Patent

CA 2191893

Heterocyclic aldehydes having the formula (I), in which A, B stand for possibly substituted methylene groups; m, n = 1 to 5 and m+n > 2, are prepared by hydrogenating carboxylic acids having the formula (IIa) or their esters (IIb) derived from C1-C10 alcohols at 200 to 450 ~C in the presence of a catalyst. The products thus obtained are useful as precursors of cyclohexenone type herbicides.

L'invention concerne la préparation d'aldéhydes hétérocycliques de formule (I), dans laquelle A, B désignent des groupes méthylène éventuellement substitués; m, n sont compris entre 1 et 5 et m+n > 2, par hydrogénation d'acides carboxyliques de formule (IIa) ou de leurs esters (IIb) dérivés d'alcools C¿1? à C¿10? à une température comprise entre 200 et 450 ~C, en présence d'un catalyseur. Les produits ainsi obtenus sont utiles comme précurseurs d'herbicides du type de la cyclohexénone.

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