Microwave synthesis of quinacridone intermediates

Details Microwave synthesis of quinacridone intermediates Microwave synthesis of quinacridone intermediates

C - Chemistry, Metallurgy

07

C

C07C 229/48 (2006.01) C07C 227/18 (2006.01) C07C 229/62 (2006.01) C07C 231/12 (2006.01) C07C 237/24 (2006.01) C07C 237/30 (2006.01) C07C 253/30 (2006.01) C07C 255/58 (2006.01) C07C 315/04 (2006.01) C07C 317/36 (2006.01)

Patent

CA 2246116

This invention relates to a process for preparing 2,5-dianilinotere- phthalic or 2,5-dianilino-3,6-dihydroterephthalic acid, ester, or amide by (a) exposing to microwave radiation a reaction mixture of (i) a succinylsuccinic compound, (ii) about 2 to about 5 moles per mole of succinylsuccinic compound (a)(i) of an aniline, (iii) about 0.01 to about 2.5 equivalents, based on succinylsuccinic compound (a)(i), of an acid catalyst, and (iv) about 0.05 to about 10 parts by weight, per part by weight of succinylsuccinic compound (a)(i), of a solvent, thereby forming a 2,5-dianilino-3,6-dihydroterephthalic compound, (b) optionally, oxidizing the initially formed 2,5-dianilino-3,6-dihydro- terephthalic compound to form a corresponding 2,5-dianilinotere- phthalic compound.

La présente invention porte sur une méthode pour préparer un acide 2,5-dianilinotéréphtalique ou un acide 2,5-dianilino-3,6-dihydrotéréphtalique, un ester ou un amide correspondants, (a) en exposant aux micro-ondes un mélange réactionnel (i) d'un composé succinylsuccinique (ii) d'environ 2-5 moles par mole de composé succinylsuccinique (a)(i) d'une aniline, (iii) environ 0,01-2,5 équivalents, à base d'un composé succinylsuccinique (a)(i), d'un catalyseur acide, et (iv) environ 0,05-10 parties en poids, par partie de composé succinylsuccinique (a)(i), d'un solvant, en formant ainsi un composé 2,5-dianilino-3,6-dihydrotéréphtalique, (b) en oxydant facultativement le composé 2,5-dianilino-3,6-dihydro-téréphtalique, formé initialement, pour obtenir le composé 2,5-dianilinotéréphtalique.

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