4-Methoxy-2,5-dimethylbenzaldehyde → Tetrahydro-3,5-bis[(4-methoxy-2,5-dimethylphenyl)methylene]-4H-pyran-4-one

Beteiligte Stoffe

Reaktionsschritte

A solution of 7.0 g (0.07 mole) of tetrahydro-4H-pyran-4-one and 25.2 g (0.15 mole) of 2,5-dimethyl-p-anisaldehyde in 75 ml of EtOH and 10 ml of concentrated HCl is stirred and heated at reflux for 3 hours. The resulting mixture is kept at room temperature for 24 hours, yielding 10.7 g (39%) of yellow solid, m.p. 182°-184°.

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