Catalysed acylation of alkylated benzene derivatives

Details Catalysed acylation of alkylated benzene derivatives Catalysed acylation of alkylated benzene derivatives

2006-08-08

2006-08-08

Richter, Johann (Department: 1621)

Organic compounds -- part of the class 532-570 series

Organic compounds

Oxygen containing

C568S316000, C568S335000

Reexamination Certificate

active

07087791

ABSTRACT:
An ecofriendly process for acylation of an alkylated benzene derivative has increased selectively towards para position and comprises a step of reacting the alkylated benzene derivative with an acylating agent in the presence of nitrobenzene, dichlorobenze, dimethylsulfolane, and/or benzotrile, and a crystalline alumino silicate catalyst having general formula M2
O.Al2O3.xSiO2.wH2O, wherein M is an alkali cation, a rare earth cation, and/or a proton, wherein the Si/Al ratio is in the range of 5.5 to 20, wherein the step of reacting is performed at temperature between 80° to 140° C. for 5 to 25 hours. In a further step, the solid catalyst is separated from the reaction mixture of step, and in yet another step, the acylated alkyl benzene derivative is separated from the mixture.

REFERENCES:
patent: 5068448 (1991-11-01), Lindley et al.
patent: 5395975 (1995-03-01), Siegel et al.
patent: 6194616 (2001-02-01), Spagnol et al.
patent: 6384285 (2002-05-01), Choudary et al.

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