Role of Ring Ortho Substituents on the Configuration of Carotenoid Polyene Chains
journal contributionposted on 10.01.2018, 12:51 by Minsoo Kim, Hyunuk Jung, Albert C. Aragonès, Ismael Díez-Pérez, Kwang-Hyun Ahn, Wook-Jin Chung, Dahye Kim, Sangho Koo
The 9-(Z)-configuration was exclusively obtained in the carotenoid polyene chain irrespective of olefination and disconnection methods for terminal ortho-unsubstituted benzene rings. The 2,6-dimethyl substituents in the terminal rings secure an all-(E)-polyene structure. The single molecular conductance of the pure 9-(Z)-carotene was measured for the first time to be 1.53 × 10–4 ± 6.37 × 10–5G0, whose value was 47% that of the all-(E)-carotene ((3.23 × 10–4) ± (1.23 × 10–4) G0).