Manufacture of symmetrical carotenoids
AssigneeBASF SE
InventorsBernhard Schulz, Joachim Paust, Joachim Schneider
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Abstract
Symmetrical carotenoids are prepared from the half-molecules by dimerizing the phosphonium salts of the half-molecules with peroxides, peroxo compounds or peroxy compounds in an alkaline medium.
Claims8
A process for the manufacture of symmetrical carotenoids from triarylphosphonium salts of the half-molecules of these symmetrical carotenoids, wherein triarylphosphonium salts of the half-molecules are reacted with from 0.8 to 5 times the molar amount of a peroxide, a peroxo compound or a peroxy compound in the presence of a base in water or an aqueous solvent mixture at temperatures of from -50.degree. to +100.degree. C, the half-molecules dimerizing with the formation of a double bond and the elimination of triarylphosphine oxide.
Dependencies are inferred from the claim text.