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Related Concept Videos

Conjugation01:19

Conjugation

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Conjugation is a form of horizontal gene transfer that primarily occurs in bacteria and some archaea, promoting genetic diversity and adaptation. Bacteria can acquire resistance genes through conjugative plasmids, allowing them to survive antibiotic treatments that would otherwise be lethal. This process involves direct contact between cells through specialized structures such as the sex pilus and is mediated by conjugative plasmids, including the F (fertility) factor.Conjugation requires...
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Mechanism of Conjugation01:19

Mechanism of Conjugation

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Bacterial conjugation is a mechanism of horizontal gene transfer that enables the exchange of genetic material between bacterial cells through direct contact. This process is facilitated by a donor cell carrying a conjugative plasmid, which encodes genes necessary for pilus formation, DNA replication, and transfer. The conjugative plasmid plays a central role in initiating and executing the transfer of genetic material.The tra region of the conjugative plasmid encodes proteins responsible for...
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Stability of Conjugated Dienes01:28

Stability of Conjugated Dienes

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Introduction
A comparison of the enthalpies of hydrogenation of dienes reveals that conjugated dienes release less heat on hydrogenation, rendering them more stable than their nonconjugated analogs.
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Peptidoglycan Synthesis01:28

Peptidoglycan Synthesis

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Structure of PeptidoglycanPeptidoglycan is a vital structural component of the bacterial cell wall, providing mechanical strength and shape to the cell. It consists of repeating units of two sugars—N-acetylglucosamine (NAG) and N-acetylmuramic acid (NAM)—linked by β-1,4 glycosidic bonds. These sugar chains are cross-linked by short peptide chains, forming a mesh-like polymer that surrounds the bacterial plasma membrane.Cytoplasmic Phase – Precursor SynthesisPeptidoglycan...
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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.
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Regioselectivity of Electrophilic Additions to Alkenes: Markovnikov's Rule02:17

Regioselectivity of Electrophilic Additions to Alkenes: Markovnikov's Rule

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If a set of reactants can yield multiple constitutional isomers, but one of the isomers is obtained as the major product, the reaction is said to be regioselective. In such reactions, bond formation or breaking is favored at one reaction site over others.
The hydrohalogenation of an unsymmetrical alkene can yield two haloalkane products, depending on which vinylic carbon takes up the halogen. However, one product usually predominates, where hydrogen adds to the vinylic carbon bearing the...
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Homogeneous Glycoconjugate Produced by Combined Unnatural Amino Acid Incorporation and Click-Chemistry for Vaccine Purposes
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A Germylene Stabilized by Homoconjugation.

Zhaowen Dong1, Crispin R W Reinhold1, Marc Schmidtmann1

  • 1Institut für Chemie, Carl von Ossietzky Universität Oldenburg, 26129, Oldenburg, Carl-von-Ossietzky-Strasse 9-11, Germany.

Angewandte Chemie (International Ed. in English)
|November 19, 2016
PubMed
Summary
This summary is machine-generated.

Researchers synthesized a novel bicyclic germylene. This compound, stabilized by unique electronic interactions, acts as a linker in new bimetallic hafnium complexes.

Keywords:
X-ray diffractioncarbene analoguesgermaniumhomoconjugationhyperconjugation

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Area of Science:

  • Organometallic Chemistry
  • Main Group Chemistry

Background:

  • Germylenes are compounds containing a divalent germanium atom.
  • Stabilization of low-coordinate main group elements is crucial for their isolation and reactivity.

Purpose of the Study:

  • To synthesize a novel bicyclic germylene.
  • To investigate the electronic structure and stabilization of the germylene.
  • To explore the reactivity of the germylene as a linker in organometallic complexes.

Main Methods:

  • Reaction of a germole dianion with hafnocene dichloride.
  • Spectroscopic characterization of the synthesized germylene.
  • Synthesis and characterization of bimetallic complexes.

Main Results:

  • Successful synthesis of a bicyclic germylene.
  • Demonstration of homoconjugative stabilization involving the germanium atom and a remote double bond.
  • Germylene exhibits nucleophilic character.
  • Formation of bimetallic hafnium/iron and hafnium/tungsten complexes using the germylene as a linker.

Conclusions:

  • A novel, stabilized bicyclic germylene has been synthesized.
  • The study highlights a unique stabilization mechanism for germylenes.
  • The synthesized germylene serves as a versatile linker for constructing complex bimetallic structures.