(3R,3'R)-Zeaxanthin was reacted with hydrazoic acid in a Mitsunobu rea
ction to yield azides with inverted configuration. Reduction of these
azides with hydrogen telluride provided (3S)-2',3'-didehydro-beta,beta
-caroten-3-amine, (3R,3'S)-3'-amino-beta,beta-caroten-3-ol and (3S,3'S
)-beta,beta-carotene-3,3'-diamine.