Acetic Anhydride → HCID 10136159, compound

Participants

Reaction Conditions

Reaction Steps

53.6 g (0.53 mol) of acetic anhydride are added dropwise over a period of about 10 minutes to a suspension of 183.3 g (0.50 mol) of 3-(3,5-dimethyl-4-hydroxyphenyl)-5,7-di-tert-butylbenzofuran-2-one (compound (107), Table 1, Example 2) in 250 ml of xylene and 0.5 ml (7.7 mmol) of methanesulfonic acid which is stirred at 105° C. under a nitrogen atmosphere. The clear, colourless reaction mixture is concentrated at about 170° C. under a slight vacuum. 500 ml of 1-butanol are carefully added to the residue and the mixture is cooled with ice/water. The precipitated product is filtered and washed with 100 ml of 1-butanol. Drying gives 197.6 g (97%) of 3-(4-acetoxy-3,5-dimethylphenyl)-5,7-di-tert-butylbenzofuran-2-one, melting point 165°-166° C. (compound (109), Table 1).

Provenance & Evidence