A new one-pot process for the preparation of 7-aryl-2,6-disubstituted quinone methides
申请人:CIBA-GEIGY AG
公开号:EP0744392A1
公开(公告)日:1996-11-27
The instant invention pertains to a new one-pot process for the facile preparation of 7-aryl-2,6-disubstituted quinone methides of formula I
where R1 and R2 are independently alkyl of 1 to 18 carbon atoms, cycloalkyl of 5 to 12 carbon atoms or phenylalkyl of 7 to 15 carbon atoms, and R3 is 2-, 3- or 4-pyridyl, 2- or 3-thienyl, 2- or 3-pyrryl, 2- or 3-furyl, aryl of 6 to 10 carbon atoms, or said aryl substituted by one to three alkyl of 1 to 8 carbon atoms, alkoxy of 1 to 8 carbon atoms, alkylthio of 1 to 8 carbon atoms, alkylamino of 1 to 8 carbon atoms, dialkylamino of 2 to 8 carbon atoms, alkoxycarbonyl of 2 to 8 carbon atoms, hydroxy, nitro, amino, cyano, carboxy, aminocarbonyl, chloro or mixtures of said substituents,
which are useful as polymerization inhibitors for vinyl aromatic and acrylic monomers.
该瞬时发明涉及一种新的一锅法制备7-芳基-2,6-二取代喹喙甲烯的简便方法,其化学式为I,其中R1和R2分别为1至18个碳原子的烷基,5至12个碳原子的环烷基或7至15个碳原子的苯基烷基,R3为2-、3-或4-吡啶基、2-或3-噻吩基、2-或3-吡咯基、2-或3-呋喃基、6至10个碳原子的芳基或被1至3个碳原子为1至8个碳原子的烷基、1至8个碳原子的烷氧基、1至8个碳原子的硫代烷基、1至8个碳原子的烷基氨基、2至8个碳原子的二烷基氨基、2至8个碳原子的烷氧羰基、羟基、硝基、氨基、氰基、羧基、氨基羰基、氯基或上述取代基的混合物,这些化合物可作为对乙烯芳香族和丙烯酸单体的聚合抑制剂。