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Aromatic Hydrocarbon Anions: Structural Overview01:18

Aromatic Hydrocarbon Anions: Structural Overview

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Neutral hydrocarbons like cyclopentadiene with an odd number of carbon atoms and one intervening CH2 group in the ring are not aromatic. Cyclopentadiene with 4 π electrons does not satisfy the 4n + 2 π electron rule. Additionally, the intervening CH2 group is sp3 hybridized and lacks a vacant p orbital, thereby interrupting the overlap of p orbitals in a continuous manner and preventing the delocalization of π electrons throughout the ring.
Due to the absence of continuous...
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Polymer Classification: Stereospecificity01:26

Polymer Classification: Stereospecificity

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Polymerization generates chiral centers along the entire backbone of a polymer chain. Accordingly, the stereochemistry of the substituent group has a significant effect on polymer properties. Polymers formed from monosubstituted alkene monomers feature chiral carbons at every alternate position in the polymer backbone. Relative to the predominant orientation of substituents at the adjacent chiral carbons, the polymer can exist in three different configurations: isotactic, syndiotactic, and...
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Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)01:16

Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)

3.2K
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...
3.2K
Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

4.0K
Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
Removing one hydrogen from the intervening CH2 group...
4.0K
ortho–para-Directing Activators: –CH3, –OH, –⁠NH2, –OCH301:11

ortho–para-Directing Activators: –CH3, –OH, –⁠NH2, –OCH3

7.6K
All ortho–para directors, excluding halogens, are activating groups. These groups donate electrons to the ring, making the ring carbons electron-rich. Consequently, the reactivity of the aromatic ring towards electrophilic substitution increases. For instance, the nitration of anisole is about 10,000 times faster than the nitration of benzene. The electron-donating effect of the methoxy group in anisole activates the ortho and para positions on the ring and stabilizes the corresponding...
7.6K
Frost Circles for Different Conjugated Systems01:18

Frost Circles for Different Conjugated Systems

3.9K
The inscribed polygon method is consistent with Hückel’s 4n + 2 rule and helps to learn whether the given cyclic compound is aromatic or not. The compound is stable and aromatic if every bonding molecular orbital (MO) is completely filled with a pair of electrons. However, if the non-bonding or antibonding orbitals are filled with electrons, the compound is unstable and not aromatic. Consider the Frost circle diagrams for cycloalkenes containing 4 to 8 carbons.
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A BN Aromatic Ring Strategy for Tunable Hydroxy Content in Polystyrene.

Heidi L van de Wouw1, Jae Young Lee1, Elorm C Awuyah1

  • 1Department of Chemistry, Johns Hopkins University, 3400 N. Charles St, Baltimore, MD 21218, USA.

Angewandte Chemie (International Ed. in English)
|December 22, 2017
PubMed
Summary

Boron-containing aromatic vinyl monomers are copolymerized with styrene, creating functional copolymers. These novel polymers exhibit tunable properties like solubility and glass transition temperature, offering a versatile platform for advanced materials.

Keywords:
amphiphilesboranescopolymerizationheterocyclesoxidation

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Organic Chemistry

Background:

  • Boron-containing aromatic vinyl monomers offer unique chemical properties.
  • Copolymerization with styrene provides a route to functional polymers.
  • Tuning polymer properties is crucial for advanced material applications.

Purpose of the Study:

  • To copolymerize BN 2-vinylnaphthalene with styrene.
  • To synthesize styrene-vinyl alcohol (SVA) statistical copolymers.
  • To investigate the structure-property relationships of these novel copolymers.

Main Methods:

  • Free radical polymerization of BN 2-vinylnaphthalene and styrene.
  • Oxidation of the resulting copolymers to introduce hydroxyl groups.
  • Spectroscopic analysis (e.g., NMR, FTIR) for structural elucidation.
  • Characterization of physical properties (solubility, glass transition temperature).

Main Results:

  • Successful synthesis of SVA statistical copolymers with controlled hydroxy group content.
  • Systematic variation of physical properties (solubility, Tg) with increasing hydroxy content.
  • Confirmation of copolymer structure through comprehensive spectroscopic data.
  • Demonstration of the versatility of BN aromatic polymers for functionalization.

Conclusions:

  • Styrene-vinyl alcohol copolymers can be synthesized from BN 2-vinylnaphthalene and styrene.
  • The hydroxy group content significantly influences the physical properties of the copolymers.
  • BN aromatic polymers serve as a valuable platform for creating diverse functional polymeric materials.
  • The C-B bond chemistry enables the preparation of various functional polymeric architectures.