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Journal: JOURNAL OF ENERGETIC MATERIALS | Year:1391 | Volume:7 | Issue:2(15) | Start Page:17 | End Page:25

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Title

SELECTIVE TERT -BUTYLATION OF P -CRESOL WITH ACIDIC IONIC LIQUIDS

Pages

 Start Page 17 | End Page 25

Abstract

 Uses of antioxidants in COMPOSITE PROPELLANTs formulation are unavoidable. These materials are added to propellants to afford stability during storage time. In this paper, synthesis of 2-t-butyl p-cresol intermediate for the preparation of A.O.2246 using Bronsted acidic IONIC LIQUIDS as catalyst and solvent were investigated. Methyl-tert-butyl ether was used for tert butylation of para cresol and variable reaction parameters such as temperature, mole ratio, type and catalyst composition and time were optimized. Tert butylation of p-cresol gives two products, 2-tert-butyl p-cresol and 2, 6-di-tert-butyl p-cresol. Among IONIC LIQUIDS, triphenyl (butyl-4-sulphonyl) phosphonium sulfonate, irrespective of the alkylating agent, is the most active catalyst. In the presence of triphenyl (butyl-4-sulphonyl) phosphonium sulfonate, 2-t-butyl p-cresol was the main product of reaction with 91.7% of selectivity and 73.2% of p-cresol conversion.

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