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Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)00:53

Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)

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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.
Similar to cross-metathesis, ADMET also involves the formation of metallacyclobutane intermediate by [2+2] cycloaddition of one of the double bonds of a terminal diene with...
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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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Nomenclature of Alkynes02:39

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Alkynes are unsaturated hydrocarbons characterized by the presence of carbon-carbon triple bonds and have a general formula CnH2n-2. The nomenclature of alkynes follows a set of rules similar to alkanes and alkenes; however, alkynes bear the suffix "-yne" instead of "-ane" or "-ene." There are two approaches to naming alkynes:
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Olefin Metathesis Polymerization: Overview01:13

Olefin Metathesis Polymerization: Overview

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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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Defining Psychology01:24

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Psychology is the scientific discipline dedicated to understanding both observable behavior and the internal mental processes underlying such behavior. It aims to comprehend human nature and apply this understanding to solve practical problems, enhance well-being, and improve societal outcomes. An example of psychology's application is the study of prosocial behavior, such as why and under what conditions individuals might help strangers in need. This process involves describing observed...
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Acidity of 1-Alkynes02:42

Acidity of 1-Alkynes

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The acidic strength of hydrocarbons follows the order: Alkynes > Alkenes > Alkanes. The strength of an acid is commonly expressed in units of pKa — the lower the pKa, the stronger the acid. Among the hydrocarbons, terminal alkynes have lower pKa values and are, therefore, more acidic. For example, the pKa values for ethane, ethene, and acetylene are 51, 44, and 25, respectively, as shown here.
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Well-Defined Alkyne Metathesis Catalysts: Developments and Recent Applications.

Henrike Ehrhorn1, Matthias Tamm1

  • 1Institut für Anorganische und Analytische Chemie, Technische Universität Braunschweig, Hagenring 30, 38106, Braunschweig, Germany.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|October 23, 2018
PubMed
Summary

Alkyne metathesis, a 50-year-old reaction, has seen significant advancements in the last two decades. This review covers efficient catalysts and diverse methodologies like alkyne cross-metathesis (ACM) and polymerization techniques.

Keywords:
alkylidyne complexesalkyne metathesisalkynescatalysismetathesis

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Area of Science:

  • Organic Chemistry
  • Catalysis
  • Polymer Science

Background:

  • Alkyne metathesis has a long history but has experienced rapid development recently.
  • Catalyst design and reaction methodologies have evolved significantly over the past 20 years.

Purpose of the Study:

  • To review the progress in alkyne metathesis catalysts and methodologies.
  • To highlight the applications of alkyne metathesis in various scientific fields.

Main Methods:

  • Review of well-defined, in situ formed, and heterogeneous alkyne metathesis catalysts.
  • Discussion of various alkyne metathesis reactions: ACM, RCAM, cyclooligomerization, ADIMET, ROAMP.
  • Summary of recent advancements in diyne metathesis (RCDM, DYCM).

Main Results:

  • Development of highly efficient and well-studied alkyne metathesis catalysts.
  • Broad applicability of alkyne metathesis in natural product synthesis, materials science, and supramolecular chemistry.
  • Emergence of new diyne metathesis methods.

Conclusions:

  • Alkyne metathesis is a powerful and versatile synthetic tool.
  • Continued catalyst development and methodological innovation are expanding its scope.
  • Significant impact on synthesis and materials science is evident.