Helicates with Ether‐Substituted Catechol Esters as Ligands
Mevissen, C., Kwamen, C., Himmel, L., Chen, X., Brückner, M., Huda, S., Göb, C., Jenniches, J., Oppel, I., Ward, J., Rissanen, K., & Albrecht, M. (2020). Helicates with Ether‐Substituted Catechol Esters as Ligands. European Journal of Organic Chemistry, 2020(32), 5161-5172. https://doi.org/10.1002/ejoc.202000843
Published inEuropean Journal of Organic Chemistry
© 2020 the Authors
Mono‐ or biscatechol esters with ether‐type substituents or spacers form either triple lithium bridged dimeric helicates or triple stranded helicates with the ability to bind three lithium cations in their interior. Hierarchical helicates with ether or thioether substituents show in solution a monomer‐dimer equilibrium which is independent of the heteroatom in the ester substituent. However, dimerization constants are significantly lower than for corresponding alkyl derivatives. Dinuclear helicates with oligoether spacers are well obtained in the presence of lithium cations. Upon removal of the cations the helicates expand and successive addition of LiCl results in compression again.
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Additional information about fundingX. C. acknowledges the support by the Chinese Scholarship Council (CSC).
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