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Paramétrages

Paramétrages

1. WO2005063667 - PROCEDE DE PREPARATION DE DIMETHYLBENZOPHENONES

Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

We Claim:
1. A process for preparing 4,4' - dimethylbenzophenone of formula 1



Formula 1
which comprises acylating toluene with an acylating agent in the presence of a solid acid triflic acid functionalized mesoporous zirconia catalyst, and separating the product obtained.
A process as claimed in claim 1 wherein the reaction is carried out for a time period in the range of 1 to 24 hours.
A process as claimed in claim 1 wherein the reaction is carried out at a temperature in the range of 100-150°C.
A process as claimed in claim 1 wherein the acylating agent is selected from halides of benzoic acids.
5. A process as claimed in claim 1 wherein the trifle acid functionalized mesoporous zirconia catalyst has the molar composition:
Zr(OC4H9)4 : BuOH : CTMABr : TMAOH : H2O
Mesoporous Zr(OH)4 : Dry toluene : CF3SO3H
wherein Zr(OC H9)4 is Zirconium tetra butoxide, BuOH is 1-butanol, CTMABr is Cetyltrimethylammonium bromide, TMAOH is Tetramethylammonium hydroxide, Zr(OH)4 is Zirconium tetra hydroxide, and CF3 SO3 H is triflic acid, having Zr (OH)4 / CF3 SO3 H molar ratio of from 5-30 and a pore size of 0.45 - 0.33 A, and surface of 371-284.m2/g.
6. A process as claimed in claim 1 wherein the molar ratio of toluene to the acylating agent is in the range of 1 : 1 to 10: 1.
7. A process as claimed in claim 4 wherein the acylating agent comprises para-toluoyl chloride.