dibenzoylmethane/high quality/best price CAS NO.120-46-7

1,3-diphenyl-1,3-propanedione (dibenzoylmethane, dbm) is an aromatic 1,3-diketone derivative of acetylacetone (acac), where both methyl groups in acac have been substituted by phenyl groups. it is a white solid melting at 77−78°c. similar to acac, dbm exists in two tautomeric forms, with the keto-enol equilibrium of dbm shifting strongly towards the enol form, particularly in non-polar solvents such as benzene. this is the result of the stability of the intramolecular hydrogen bond in the cis-enol form which is further resonance-stabilized by conjugation with phenyl rings. due to its high photostability, derivatives of dbm such as avobenzone, have found applications as sunscreen products.