PROPERTIES OF THE CAROTENOIDS 



645 



330 



370 



WAVE LENGTH IN M;U- 



P^ig. 25. Development of the ch peak in a hexane solution of all-Zm/is- 

 lycopene in an iodine-catalyzed solution exposed to light: ( — ) molecular 

 extinction curve of all-fraws-lycopene ; (• • •) mixture of isomers after 



seconds; (- -) after 5 seconds; ( ) after 30 seconds; ( ) after 15 



minutes illumination. ''^^ 



Table 30 



Position of cis Peak of Stereoisomeric Equilibrium Mixtures of Some C4 



Carotenoids Obtained After Iodine Catalysis" 



« Adapted from L. Zechmeister, Chem. Revs., 84, 267-344 (1944), p. 302. 

 <> Data from L. Zechmeister and A. Polgdr, J. Am. Chem. Soc, 65, 1522-1528 (1943), 

 p. 1523. 



= L. Zechmeister and W. A. Schroeder, J. Am. Chem. Soc., 65, 1535-1540 (1943). 



