Related Experiment Video
Updated: Mar 18, 2026

1,3,5-Triphenylbenzene and Corannulene as Electron Receptors for Lithium Solvated Electron Solutions
Published on: October 10, 2016
Thermal Isomerization of All-trans-Lutein in a Benzene Solution
A Subagio1, N Morita1, S Sawada2
1a Laboratory of Food Chemistry, College of Agriculture, Osaka Prefecture University.
Abstract:
Four major cis-lutein isomers could be identified after thermal isomerization of all-trans-lutein in a benzene solution system; namely, 13'-, 13-, 9'- and 9-cis-luteins. Using both all-trans-lutein and a mixture of these purified cis-luteins as starting materials, the quantitative changes determined by HPLC response show that this thermal isomerization was a reversible reaction. The equilibrium constants (k C ) of 13'- and 13-cis-luteins were higher than those of 9'-, and 9-cis-luteins, suggesting that the amount formed of the former isomers was higher than that of the latter.
More Related Videos
06:24High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal
Published on: October 31, 2019
05:34Efficient Synthesis of Polyfunctionalized Benzenes in Water via Persulfate-promoted Benzannulation of α,β-Unsaturated Compounds and Alkynes
Published on: December 16, 2019
Related Concept Videos
Reduction of Benzene to Cyclohexane: Catalytic Hydrogenation
Thermal Electrocyclic Reactions: Stereochemistry
Selection Rules: Thermal Activation
Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.
Thermal and Photochemical Electrocyclic Reactions: Overview
Reactions at the Benzylic Position: Halogenation
Electrophilic Aromatic Substitution: Chlorination and Bromination of Benzene
Photochemical Electrocyclic Reactions: Stereochemistry
Selection Rules: Photochemical Activation