Flavone
Title: Flavone
CAS Registry Number: 525-82-6
CAS Name: 2-Phenyl-4H-1-benzopyran-4-one
Additional Names: 2-phenylchromone; 2-phenyl-g-benzopyrone; 2-phenyl-1,4-benzopyrone
Molecular Formula: C15H10O2
Molecular Weight: 222.24
Percent Composition: C 81.07%, H 4.54%, O 14.40%
Literature References: Prepn: Feuerstein, Kostanecki, Ber. 31, 1757 (1898); Kostanecki, Tambor, Ber. 33, 330 (1900); Kostanecki, Szabranski, Ber. 37, 2634 (1904); Ruhemann, Ber. 46, 2192 (1913); Bogert, Marcus, J. Am. Chem. Soc. 41, 89 (1919). Isoln from Primula malacoides, Franch., Primulaceae and biological properties: Weller et al., Antibiot. Chemother. 3, 603 (1953). Syntheses: Wheeler, Org. Synth. coll. vol. IV, 478 (1963); Y. Ashihara et al., Bull. Chem. Soc. Jpn. 50, 3298 (1977); A. Banerji, N. C. Goomer, Synthesis 1980, 874.
Properties: Crystals from petr ether, mp 99-100°. Practically insol in water. Sol in most organic solvents. Absorption max: 350, 405 nm.
Melting point: mp 99-100°
Absorption maximum: Absorption max: 350, 405 nm

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