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Updated: Aug 9, 2026

Heterogeneous Removal of Water-Soluble Ruthenium Olefin Metathesis Catalyst from Aqueous Media Via Host-Guest Interaction
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Heterogeneous Removal of Water-Soluble Ruthenium Olefin Metathesis Catalyst from Aqueous Media Via Host-Guest Interaction

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一个单向的能量转移级联过程在一个由α-和β-cyclodextrins自组装的鲁结

Jonathan A Faiz1, René M Williams, Maria José J Pereira Silva

  • 1School of Chemistry, University of Birmingham, Edgbaston, B15 2TT, UK.

Journal of the American Chemical Society
|April 6, 2006
PubMed
概括

研究人员开发了一种自组装系统,使用鲁 (II) 复合物和环氧来制造分子电线. 这个系统有效地在光活性客体之间道光能,为纳米尺寸阵列铺平了道路.

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Single-step Purification of Macromolecular Complexes Using RNA Attached to Biotin and a Photo-cleavable Linker08:12

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Thermal and Photochemical Electrocyclic Reactions: Overview01:26

Thermal and Photochemical Electrocyclic Reactions: Overview

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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Thermal Electrocyclic Reactions: Stereochemistry

The stereochemistry of electrocyclic reactions is strongly influenced by the orbital symmetry of the polyene HOMO. Under thermal conditions, the reaction proceeds via the ground-state HOMO.
Selection Rules: Thermal Activation
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Photochemical Electrocyclic Reactions: Stereochemistry

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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