Title: Flavoxanthin
CAS Registry Number: 512-29-8
CAS Name: (3S,3¢R,5R,6¢R,8R)-5,8-Epoxy-5,8-dihydro-b,e-carotene-3,3¢-diol
Molecular Formula: C40H56O3
Molecular Weight: 584.87
Percent Composition: C 82.14%, H 9.65%, O 8.21%
Literature References: Carotenoid pigment; stereoisomer of chrysanthemaxanthin, q.v. Often found in plants, but in minute amounts only and never as a principal pigment. Isoln from Ranunculus acris L., Ranunculaceae: Kuhn, Brockmann, Z. Physiol. Chem. 213, 192 (1932). Structure: Karrer, Rutschmann, Helv. Chim. Acta 25, 1144 (1942). Partial synthesis: Karrer, Jucker, ibid. 28, 300 (1945). Absolute configuration: H. Cadosch et al., ibid. 61, 783 (1978).
Properties: Golden-yellow aggregates of prisms, mp 184°. Absorption max (chloroform): 430, 459 nm. [a]20Cd +190° (c = 0.04 in benzene). Freely sol in chloroform, benzene, acetone; less sol in methanol, ethanol. Almost insol in petr ether.
Melting point: mp 184°
Optical Rotation: [a]20Cd +190° (c = 0.04 in benzene)
Absorption maximum: Absorption max (chloroform): 430, 459 nm

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