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Related Concept Videos

Olefin Metathesis Polymerization: Overview01:13

Olefin Metathesis Polymerization: Overview

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.
Ruthenium-based Grubbs catalyst is the most commonly used catalyst for olefin metathesis polymerization. Grubbs catalyst consists of a...
Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)01:16

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

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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Spirochetes, unique bacteria in the phylum Spirochaetes, are gram-negative, motile, tightly coiled, slender, and flexible. They inhabit aquatic sediments and animals, with some causing diseases like syphilis. Spirochetes are classified into eight genera based on habitat, pathogenicity, phylogeny, and characteristics.Their distinctive motility arises from endoflagella, located within the cell’s periplasm. These endoflagella anchor at the cell poles and extend along the cell length, encased by a...
Thermal Electrocyclic Reactions: Stereochemistry01:17

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
Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.
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.
Preparation of Diols and Pinacol Rearrangement01:57

Preparation of Diols and Pinacol Rearrangement

Compounds bearing two hydroxyl groups are known as diols. When the hydroxyl groups are located on adjacent carbon atoms, the diols are called vicinal diols or glycols. Under acidic conditions, vicinal diols undergo a specific reaction called pinacol rearrangement.
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Solid-phase Synthesis of [4.4] Spirocyclic Oximes
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Solid-phase Synthesis of [4.4] Spirocyclic Oximes

Published on: February 6, 2019

Spiro oligothiophenes.

Makoto Miyasaka1, Maren Pink, Suchada Rajca

  • 1Department of Chemistry, University of Nebraska, Lincoln, Nebraska 68588-0304, USA.

Organic Letters
|June 17, 2010
PubMed
Summary
This summary is machine-generated.

Novel spirocyclizations of linear oligothiophenes yield unique all-thiophene spiro and dispiro structures. This process results in high yields and diastereoselectivity for complex thiophene frameworks.

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Area of Science:

  • Organic Chemistry
  • Materials Science
  • Polymer Chemistry

Background:

  • Linear oligothiophenes are crucial building blocks in organic electronics.
  • Dithieno[2,3-b:3',2'-d]thiophene units offer unique structural and electronic properties.
  • Controlled synthesis of complex thiophene architectures remains a challenge.

Purpose of the Study:

  • To investigate the reactivity of specific linear oligothiophenes.
  • To explore novel synthetic pathways for complex thiophene structures.
  • To develop methods for creating spiro and dispiro oligothiophene frameworks.

Main Methods:

  • Treatment of linear oligothiophenes with annelated dithieno[2,3-b:3',2'-d]thiophene units with trifluoroacetic acid.
  • Structural characterization of the resulting products using spectroscopic and crystallographic techniques.
  • Analysis of reaction yields and diastereoselectivity.

Main Results:

  • Unexpected spirocyclization reactions were observed.
  • Novel spiro and dispiro oligothiophenes with all-thiophene/dihydrothiophene skeletons were synthesized.
  • Racemic dispiro octathiophene was obtained with high diastereoselectivity and yield.

Conclusions:

  • Trifluoroacetic acid induces efficient spirocyclization in these oligothiophenes.
  • This method provides access to previously inaccessible spirocyclic thiophene structures.
  • The synthesized compounds hold potential for advanced organic electronic applications.