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Updated: Mar 15, 2026

Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level
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氨酸-烯二胺车轮

Javier Fernández-Ariza1, Rafael M Krick Calderón2, M Salomé Rodríguez-Morgade1

  • 1Departamento de Química Orgánica, Universidad Autónoma de Madrid , Cantoblanco, 28049 Madrid, Spain.

Journal of the American Chemical Society
|September 1, 2016
PubMed
概括

周边铁素显著改变了Zn (II) 和Ru (II) 酸盐的特性. 这些修饰后的氨酸,当被整合到高分子合物中时,表现出改变的能量转移和电荷重组动态.

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Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
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The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
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