Torsionally distorted olefins. Resolution of cis- and trans-4,4'-Bi-1,1',2,2',3,3'-hexahydrophenanthrylidene

Abstract

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Photoresponsive Cholesteric Liquid Crystals

“…Overcrowded alkenes are a special class of olefins with an inherently helical shape, resulting from extensive steric crowding around the central carbon-carbon double bond [20]. These types of molecules were first reported by Feringa and coworkers who continue to champion these materials for applications such as molecular switches, molecular motors, and enablers to photogenerate dynamic optical effects in CLCs [21].…”

The Art of Building Small: From Molecular Switches to Molecular Motors

“…The chiroptical switch molecules we have constructed are helical-shaped overcrowded alkenes 10 (Figures 2-4). The switching principle in these systems is based primarily on the reversible change in helicity of the molecules.…”

In Control of Motion: From Molecular Switches to Molecular Motors

“…6 But the molecular basis was already established more than 10 years earlier, when the author as a student synthesized the first sterically overcrowded inherent dissymmetric alkenes of which both cis and trans forms exist as stable enantiomers. 7 In this Account will be described how we came from chiral molecular switches via triggering of the organization and controlled motion of many molecules to the construction of our present second generation light-driven molecular motors.…”