Rhodoviolascin
Title: Rhodoviolascin
CAS Registry Number: 34255-08-8
CAS Name: 3,3¢,4,4¢-Tetradehydro-1,1¢,2,2¢-tetrahydro-1,1¢-dimethoxy-y,y-carotene
Additional Names: 3,3¢,4,4¢-tetradehydro-1,1¢,2,2¢-tetrahydro-1,1¢-dimethoxylycopene; spirilloxanthin
Molecular Formula: C42H60O2
Molecular Weight: 596.92
Percent Composition: C 84.51%, H 10.13%, O 5.36%
Literature References: Carotenoid pigment isolated from Rhodovibrio and Thioceptis bacteria: Karrer, Solmssen, Helv. Chim. Acta 18, 1306 (1935). Identity with spirilloxanthin: Zechmeister et al., Arch. Biochem. 5, 243 (1944). Structure: Karrer, Koenig, Helv. Chim. Acta 23, 460 (1940); Barber et al., Proc. Chem. Soc. London 1959, 96. Synthesis: Surmatis, Ofner, J. Org. Chem. 28, 2735 (1963); Surmatis, US 3160658 (1964 to Hoffmann-La Roche).
Properties: Dark red, spindle-shaped crystals from benzene, mp 218°. Absorption max (chloroform): 544, 507, 476 nm. Almost insol in petr ether, ligroin, methanol, somewhat more sol in hot benzene.
Melting point: mp 218°
Absorption maximum: Absorption max (chloroform): 544, 507, 476 nm

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