640 



VI. CAROTENOIDS AND RELATED COMPOUNDS 



^ 10 



t- 5 





300 400 



WAVE LENGTH IN MJLL 



500 



Fig. 17. Molecular extinction curves for a-caroteiie in hexane: ( — ) fresh solu- 

 tion of iiW-lrans compound; (--) mixture of stereoisomers obtained from Neo 

 U, after iodine catalysis at room temperature in light.''" 



"• 15 

 o 



300 400 



WAVE LENGTH IN MJX 



500 



Fig. 18. Molecular extinction curves for /3-carotene in hexane: ( — ) fresh solu- 

 tion of a\]-trans compound; (- -) mixture of stereoisomers obtained from Neo U, 

 after iodine catalysis at room temperature in light. '*^^ 



