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Related Concept Videos

Structure of Amines01:19

Structure of Amines

2.5K
The hybridized nitrogen atom in amines possesses a lone pair of electrons and is bound to three substituents with a bond angle of around 108°, which is less than the tetrahedral angle of 109.5°. However, the C–N–H bond angle is slightly larger at 112°, with a carbon–nitrogen bond length of 147 pm. This carbon–nitrogen bond length of of amines is longer than the carbon–oxygen bond of alcohols (143 pm) but shorter than alkanes’...
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Preparation of Amines: Alkylation of Ammonia and Amines01:30

Preparation of Amines: Alkylation of Ammonia and Amines

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Alkylation is one of the methods used to prepare amines. Direct alkylation of ammonia or a primary amine with an alkyl halide gives polyalkylated amines along with a quaternary ammonium salt through successive SN2 reactions. This process of making the quaternary salt through the direct alkylation method is called exhaustive alkylation.
Each alkylation step makes the nitrogen center more nucleophilic, which triggers successive alkylations until a quaternary ammonium salt is formed. Considering...
3.3K
Preparation of 1° Amines: Azide Synthesis01:22

Preparation of 1° Amines: Azide Synthesis

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Direct alkylation of ammonia produces polyalkylated amines, along with a quaternary ammonium salt. To exclusively prepare primary amines, the azide synthesis method can be used.
Azide ions act as good nucleophiles and react with unhindered alkyl halides to form alkyl azides. Alkyl azides do not participate in further nucleophilic substitution reactions, thereby eliminating the chances of polyalkylated products. Alkyl azides are reduced by hydride-based reducing agents, like lithium aluminum...
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Physical Properties of Amines01:26

Physical Properties of Amines

3.0K
Amines with low molecular weight are usually gaseous at room temperature, while those with high molecular weight are liquid or solids in nature. Usually, low molecular weight amines have a rotten fish-like smell. Diamines typically have a pungent smell. For instance, cadaverine and putrescine, depicted in Figure 1, are two molecules responsible for decaying tissue.
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Preparation of 1° Amines: Gabriel Synthesis01:28

Preparation of 1° Amines: Gabriel Synthesis

3.5K
Direct alkylation is not a suitable method for synthesizing amines because it produces polyalkylated products. Gabriel synthesis is the most preferred method to exclusively make primary amines. The method uses phthalimide, which contains a protected form of nitrogen that participates in alkylation only once to predominantly give primary amines.
Strong bases like NaOH or KOH deprotonate the phthalimide to form the corresponding anion, which acts as a nucleophile. Further, the anion attacks an...
3.5K
Polytene Chromosomes02:04

Polytene Chromosomes

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Polytene chromosomes are giant interphase chromosomes with several DNA strands placed side by side. They were discovered in the year 1881 by Balbiani in salivary glands, intestine, muscles, malpighian tubules, and hypoderm of larvae Chironomus plumosus. Hence, these are also called "Salivary gland chromosomes." These are found in insects of the order Diptera and Collembola; in certain organs of mammals; and synergids, antipodes of flowering plants. Polytene chromosomes are also...
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Updated: Jun 12, 2025

Facile Protocol for the Synthesis of Self-assembling Polyamine-based Peptide Amphiphiles PPAs and Related Biomaterials
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Helical polyamines.

Daniël Hagedoorn1, Sandra Michel-Souzy2, Bartłomiej Gostyński3

  • 1Department of Molecules and Materials, Sustainable Polymer Chemistry (SPC), MESA+ Institute for Nanotechnology, Faculty of Science and Technology, University of Twente P. O. Box 217 7500 AE Enschede The Netherlands frederik.wurm@utwente.nl.

Chemical Science
|September 23, 2024
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Summary
This summary is machine-generated.

Researchers developed a new method to synthesize stereocontrolled polyamines, creating the first crystalline isotactic polyamines. These polymers show potential for advanced macromolecular architectures and improved biomaterials applications.

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Organic Synthesis

Background:

  • Polyamines are crucial macromolecules, but their synthesis has largely focused on atactic polymers, limiting structural control.
  • Exploring tacticity in polyamines is essential for developing novel polymer microstructures and advanced materials.

Purpose of the Study:

  • To develop a versatile method for synthesizing stereoregular polyamines, including isotactic and stereoblock copolymers.
  • To characterize the structural, conformational, and crystalline properties of the synthesized polyamines.
  • To evaluate the potential of these novel polyamines in biomedical applications, such as gene transfection.

Main Methods:

  • Synthesis of ortho- and para-cyanobenzenesulfonyl-activated-methyl aziridines using chiral alaninol.
  • Living anionic and dispersion polymerization techniques for controlled polymer chain growth.
  • Deprotection strategies using dodecanethiol and phosphoranes to yield linear polypropylene imines (LPPIs).
  • Characterization using CD spectroscopy, molecular dynamics simulations, polarized light microscopy, AFM, and XRD.

Main Results:

  • Successful synthesis of diverse activated aziridines and subsequent polymerization to form soluble polymers and stereoblock copolymers.
  • Obtained high-purity isotactic and atactic linear polypropylene imines (LPPIs) with high yields.
  • Demonstrated helical structures in water for stereoblock copolymers and isotactic LPPIs, confirmed by simulations.
  • Achieved the first crystalline isotactic polyamines, exhibiting spherulite growth and distinct crystalline structures.
  • Isotactic LPPIs showed lower toxicity and comparable/enhanced transfection efficiency versus commercial polyethyleneimine in cell studies.

Conclusions:

  • A novel synthetic route provides access to stereoregular polyamines, including the first crystalline isotactic polyamines.
  • The synthesized isotactic polyamines exhibit unique helical structures and tunable properties for advanced applications.
  • These polymers offer a promising alternative to existing polyamines in biomaterials and macromolecular design.