Method for the production of benzophenones

C - Chemistry – Metallurgy – 07 – C

Patent

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Details

C07C 45/46 (2006.01) C07C 45/81 (2006.01) C07C 49/84 (2006.01) C07C 51/363 (2006.01) C07C 51/60 (2006.01)

Patent

CA 2508714

Disclosed is a method for producing benzophenones of formula I, wherein X can represent chlorine, hydroxy, methoxy, or C1-C6 alkylcarbonyloxy while Y represents chlorine or bromine, by reacting an acid chloride of formula II, wherein X and Y have the meaning mentioned above, with 3,4,5- trimethoxytoluene. The inventive method is characterized by the fact that the reaction is carried out in the presence of a) an aromatic hydrocarbon as a thinner, and b) 0.01 to 0.2 mole percent of an iron catalyst, the percentage being in relation to the acid chloride, c) at a temperature ranging between 60oC and the boiling point of the respective thinner.

La présente invention concerne un procédé pour produire des benzophénones de formule (I), dans laquelle X représente chlore, hydroxy, méthoxy ou alkylcarbonyle C¿1?-C¿6? et Y représente chlore ou brome, par mise en réaction d'un chlorure d'acide de formule (II), dans laquelle X et Y ont les significations susmentionnées, avec du 3,4,5-triméthoxytoluène. Cette invention est caractérisée en ce que la réaction est effectuée en présence a) d'un hydrocarbure aromatique servant de diluant et b) de 0,01 à 0,2 % molaire, par rapport au chlorure d'acide, d'un catalyseur de fer, c) à une température située entre 60 ·C et le point d'ébullition du diluant respectif.

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