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Related Concept Videos

Phase Diagrams02:39

Phase Diagrams

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A phase diagram combines plots of pressure versus temperature for the liquid-gas, solid-liquid, and solid-gas phase-transition equilibria of a substance. These diagrams indicate the physical states that exist under specific conditions of pressure and temperature and also provide the pressure dependence of the phase-transition temperatures (melting points, sublimation points, boiling points). Regions or areas labeled solid, liquid, and gas represent single phases, while lines or curves represent...
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Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
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Solids in which the atoms, ions, or molecules are arranged in a definite repeating pattern are known as crystalline solids. Metals and ionic compounds typically form ordered, crystalline solids. A crystalline solid has a precise melting temperature because each atom or molecule of the same type is held in place with the same forces or energy. Amorphous solids or non-crystalline solids (or, sometimes, glasses) which lack an ordered internal structure and are randomly arranged. Substances that...
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Peptide Bonds02:43

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A peptide bond covalently attaches amino acids through a dehydration reaction. One amino acid's carboxyl group and another amino acid's amino group combine, releasing a water molecule. The resulting bond is the peptide bond. The products that such linkages form are peptides. As more amino acids join this growing chain, the resulting chain is a polypeptide. Each polypeptide has a free amino group at one end. This end has the N-terminal, or the amino-terminal, and the other end has a free...
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Whether solid, liquid, or gas, a substance's state depends on the order and arrangement of its particles (atoms, molecules, or ions). Particles in the solid pack closely together, generally in a pattern. The particles vibrate about their fixed positions but do not move or squeeze past their neighbors. In liquids, although the particles are closely spaced, they are randomly arranged. The position of the particles are not fixed—that is, they are free to move past their neighbors to...
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Accelerators in concrete serve as admixtures to speed up the hardening process, enabling the concrete to achieve early strength faster. Although accelerators do not necessarily impact the time it takes concrete to set, they reduce this time in practice. A common accelerator is calcium chloride, which is particularly useful for hastening early strength development in cold weather or for rapid repair jobs that require quick heat generation after mixing.
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Solid Phase Synthesis of a Functionalized Bis-Peptide Using "Safety Catch" Methodology
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Proximity-driven acceleration of challenging solid-phase peptide couplings.

Joshua Parker1, Brooke A Farrell2, Karlee A Kohuth2

  • 1Department of Chemistry, The Herbert Wertheim University of Florida Scripps Institute for Biomedical Innovation and Technology, Jupiter, FL 33458.

Proceedings of the National Academy of Sciences of the United States of America
|February 2, 2026
PubMed
Summary

Solid-phase synthesis reactions are often slow. Immobilized pyridine catalysts accelerate these reactions by creating reactive intermediates, improving yields and reaction cleanliness for peptide synthesis.

Keywords:
N-methyl peptidesamide bond formationcatalysisproximitysolid-phase peptide synthesis

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Area of Science:

  • Organic Chemistry
  • Synthetic Chemistry
  • Catalysis

Background:

  • Solid-phase synthesis is crucial for peptide production.
  • Many solid-phase reactions, like ester-amine coupling, are inefficient and require harsh conditions.
  • Sterically hindered amines pose a significant challenge in solid-phase synthesis.

Purpose of the Study:

  • To develop a method for accelerating slow solid-phase synthesis reactions.
  • To improve the efficiency and yield of coupling activated esters to bead-displayed amines.
  • To investigate the use of immobilized nucleophilic catalysts in solid-phase reactions.

Main Methods:

  • Tethering a nucleophilic pyridine catalyst to the solid support (bead).
  • Formation of a reactive acylpyridinium intermediate.
  • Coupling of the intermediate with sterically hindered, bead-displayed amines.
  • Comparison of reactions with immobilized catalyst versus solution-phase catalyst.

Main Results:

  • Immobilized pyridine catalysts significantly accelerate ester-amine coupling reactions.
  • The method enhances yields, especially for sterically hindered substrates.
  • Reactions using immobilized catalysts demonstrate improved "cleanliness" compared to solution-phase methods.
  • Formation of a highly reactive acylpyridinium intermediate was observed.

Conclusions:

  • Immobilized nucleophilic pyridine catalysts are effective for accelerating challenging solid-phase synthesis reactions.
  • This approach offers a cleaner and more efficient alternative to traditional methods, particularly in peptide synthesis.
  • The local concentration of reactive intermediates is key to the observed acceleration.