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Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)

Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)

Acyclic diene metathesis polymerization or ADMET polymerization involves cross-metathesis of terminal dienes, such as 1,8-nonadiene, to give linear unsaturated polymer and ethylene. As ADMET is a reversible process, the formed ethylene gas must be removed from the reaction mixture to complete the polymerization process.
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Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)

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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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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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Switching from altro-alpha-cyclodextrin dimer to pseudo[1]rotaxane dimer through tumbling.

Kazuhiro Yamauchi¹, Atsuhisa Miyawaki, Yoshinori Takashima

¹Department of Macromolecular Science, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan.

Organic Letters

|February 26, 2010

Summary

An alkyl cyclodextrin dimer transforms into a pseudorotaxane dimer via altropyranose unit tumbling. This conformational change, driven by hydrogen bond network disruption, occurs at a specific rotational vibration frequency.

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Area of Science:

Supramolecular Chemistry
Carbohydrate Chemistry
Physical Chemistry

Background:

Cyclodextrins (CDs) are cyclic oligosaccharides with unique host-guest properties.
Alkyl-modified cyclodextrin dimers represent advanced supramolecular architectures.
Understanding conformational dynamics is crucial for designing functional molecular systems.

Purpose of the Study:

To investigate the conformational dynamics of an alkyl altro-alpha-cyclodextrin dimer.
To characterize the transformation into a pseudorotaxane dimer.
To determine the energetic and kinetic parameters of this molecular transition.

Main Methods:

Deuterated water (D2O) as a solvent.
Nuclear Magnetic Resonance (NMR) spectroscopy for dynamic analysis.
Kinetic and thermodynamic analysis of conformational changes.

Main Results:

The alkyl altro-alpha-cyclodextrin dimer converts to a pseudorotaxane dimer.
The altropyranose unit exhibits rotational vibration at 1.18 x 10(-3) s(-1) at 293 K.
Activation free energy for the conformational change is 88.0 kJ mol(-1) at 288 K.

Conclusions:

The conformational change involves the tumbling of the altropyranose unit.
The process is linked to the breakage of the intramolecular hydrogen bond network.
This study provides insights into the dynamic behavior of modified cyclodextrin systems.