Bacterial Carotenoids. XLVIII. C50-Carotenoids. 16. Synthesis and Chiroptical Properties of the Model Compounds (2R, 6R, 2'R, 6'R)-2,2'-Dimethyl-epsilon,epsilon-carotene and (2R, 6S, 2'R, 6'S)-2,2'-Dimethyl-epsilon,epsilon-carotene.

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Abstract
(2R,6S,2''R,6''S)-2,2''-Dimethyl-.epsilon.,.epsilon.-carotene and (2R,6R,2''R,6''R)-2,2''-dimethyl-.epsilon.,.epsilon.-carotene were synthesized from the corresponding optically active irones. 1H NMR and CD [circular dichroism] properties of the optically active C42-carotenes and synthetic intermediates are reported. The absolute configuration 2R,6R,2''R,6''R of the bacterial C50-carotenoid decaprenoxanthin is based on these results.