One-pot process for the preparation of...

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C - Chemistry, Metallurgy

07

C

C07C 49/587 (2006.01) C07C 45/45 (2006.01) C07C 45/51 (2006.01) C07C 49/683 (2006.01) C07C 49/753 (2006.01) C07C 65/38 (2006.01) C07C 69/76 (2006.01) C07C 201/12 (2006.01) C07C 205/45 (2006.01) C07C 221/00 (2006.01) C07C 225/22 (2006.01) C07C 235/84 (2006.01) C07C 253/30 (2006.01) C07C 255/56 (2006.01) C07C 323/22 (2006.01) C07D 207/333 (2006.01) C07D 213/50 (2006.01) C07D 307/46 (2006.01) C07D 333/22 (2006.01)

Patent

CA 2177327

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 Image (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.

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