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Olefin Metathesis Polymerization: Overview01:13

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Recently, the development of olefin metathesis polymerization advanced the field of polymer synthesis. Simply put, the reorganization of substituents on their double bonds between two olefins in the presence of a catalyst is known as the olefin metathesis reaction. The use of metathesis reaction for polymer synthesis is called olefin metathesis polymerization.
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Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)01:16

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Ring-opening metathesis polymerization or ROMP involves strained cycloalkenes as starting materials. The mechanism of ROMP proceeds by reacting cycloalkene with Grubbs catalyst to give metallacyclobutane intermediate which undergoes a ring-opening reaction to form new carbene. The new carbene reacts with another molecule of cycloalkene. Repetition of these steps leads to the formation of an unsaturated open-chain polymer product. All these steps are reversible, however, relieving the ring...
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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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Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation02:24

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Introduction
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Alkenes via Reductive Coupling of Aldehydes or Ketones: McMurry Reaction01:22

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The radical dimerization of ketones or aldehydes gives vicinal diols through a pinacol coupling reaction. However, the behavior of titanium metals used for the reaction as a source of electrons is unusual. When the reaction is carried out in the presence of titanium, diols can be isolated at low temperatures. Else titanium further reacts with diols, forming alkenes through the McMurry reaction.
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Thermal Electrocyclic Reactions: Stereochemistry01:17

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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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Pyrene-Functionalized Ru-Catenated Metallacycles: Conversion of Catenated System to Monorectangle through Aging.

Gajendra Gupta1, Junseong Lee2, Rizky Hadiputra3

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We synthesized novel catenated rectangles from ruthenium and pyrene. These structures spontaneously transform into monorectangles in nitromethane at room temperature, offering new insights into molecular self-assembly.

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The Synthesis, Characterization and Reactivity of a Series of Ruthenium N-triphosPh Complexes
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Area of Science:

  • Supramolecular Chemistry
  • Materials Science
  • Computational Chemistry

Background:

  • Mechanically interlocked molecular architectures often require chemical stimuli for structural transformations.
  • Understanding self-assembly pathways is crucial for designing complex molecular systems.

Purpose of the Study:

  • To synthesize novel ruthenium and pyrene-based catenated rectangles.
  • To investigate the spontaneous structural conversion of these catenated rectangles into monorectangles.
  • To elucidate the thermodynamic driving forces for catenated structure formation via theoretical calculations.

Main Methods:

  • Synthesis of (2+2)2 catenated rectangles using ruthenium and pyrene building blocks.
  • Solvent- and concentration-dependent structural analysis of the catenated systems.
  • Density Functional Theory (DFT) and GFN2-xTB calculations to determine binding energies and formation preferences.

Main Results:

  • Successful synthesis of ruthenium and pyrene-based (2+2)2 catenated rectangles.
  • Observation of spontaneous transformation into monorectangles in nitromethane at room temperature without external chemical manipulation.
  • Theoretical calculations confirmed that catenated structures exhibit lower binding energies, favoring their formation over ring-in-ring or Borromean structures.

Conclusions:

  • The synthesized catenated rectangles represent a new class of intertwined structures.
  • Spontaneous transformation to monorectangles in nitromethane highlights a unique stimulus-free molecular behavior.
  • Computational insights validate the thermodynamic preference for catenated assembly in this system.