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A mixture of 400 parts of mesityl oxide, 100 parts of prenol and 5 parts of 3,3-dimethylacrylic acid is heated for 4 hours at a pressure of 1.9 atmospheres and a temperature of 175°C in a still provided with means for removing water. The water formed is removed azeotropically. The reaction mixture is worked up. 85 parts of 4,8-dimethyl-3,7-nonadien-2-one is obtained. This is equivalent to a yield of 86% of theory at a conversion of 51% based on prenol.

1. temperatureis heated for 4 hours at a pressure of 1.9 atmospheres
2. customa temperature of 175°C in a still provided with means
3. customfor removing water
4. customThe water formed
5. customis removed azeotropically