Benzaldehyde → 2,2,4-Triphenyl-butane-1,4-dione

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Following the procedure described in Example 1, 57.2 g (0.275 mol) of benzylideneacetophenone, 29.2 g of benzaldehyde, 25.1 g (0.1 mol) of Catalyst 2 and 400 ml of dimethylformamide are introduced successively into the 500 ml three-necked flask and after stirring for 15 minutes under nitrogen 40.4 g (0.4 mol) of triethylamine are added. The mixture is then heated to 80° C for 12 hours. For working up, the dimethylformamide is distilled off and 150 ml of isopropanol are added to the residue while it is still hot. The product which has precipitated is filtered off, washed with isopropanol and then dried. 2,2,4-Triphenyl-butane-1,4-dione is obtained.

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