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Related Concept Videos

Support Reactions01:30

Support Reactions

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A coplanar force system refers to a set of forces that all lie in the same plane and are subject to different reactions between the point of contact and the supports. Understanding how different types of supports affect coplanar forces is crucial for designing safe and reliable structures that can withstand external loads.
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Support Reactions in Three Dimensions01:27

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Support reactions in three dimensions help maintain the stability and equilibrium of various structures and systems. These reactions prevent the system from translating and rotating, ensuring the design can withstand external forces and perform its intended function efficiently and safely. Some of the supports providing support reactions in three dimensions are discussed below:
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Polymers02:34

Polymers

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The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the...
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The turnover number of an enzyme is the maximum number of substrate molecules it can transform per unit time. Turnover numbers for most enzymes range from 1 to 1000 molecules per second. Catalase has the known highest turnover number, capable of converting up to 2.8×106 molecules of hydrogen peroxide into water and oxygen per second. Lysozyme has the lowest known turnover number of half a molecule per second.
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Catalytically Perfect Enzymes

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The theory of catalytically perfect enzymes was first proposed by W.J. Albery and J. R. Knowles in 1976. These enzymes catalyze biochemical reactions at high-speed. Their catalytic efficiency values range from 108-109 M-1s-1. These enzymes are also called 'diffusion-controlled' as the only rate-limiting step in the catalysis is that of the substrate diffusion into the active site. Examples include triose phosphate isomerase, fumarase, and superoxide dismutase.
 
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Catalytic Reactions at Amine-Stabilized and Ligand-Free Platinum Nanoparticles Supported on Titania During Hydrogenation of Alkenes and Aldehydes
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Biginelli Reaction: Polymer Supported Catalytic Approaches.

Rajendra V Patil1, Jagdish U Chavan1, Dipak S Dalal2

  • 1Department of Chemistry, P.S.G.V.P.M's SIP Arts , GBP Science and STKVS Commerce College , Shahada , Nandurbar - 425409 , India.

ACS Combinatorial Science
|January 16, 2019
PubMed
Summary

Polymer-supported catalysts enhance the Biginelli reaction, offering improved yields and greener synthesis for dihydropyrimidinone (DHPM) derivatives. These methods simplify purification and promote catalyst recyclability for economic benefits.

Keywords:
Biginelli reactionsDHPMnanocompositespolymer-supported catalysts

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Area of Science:

  • Organic Chemistry
  • Medicinal Chemistry

Background:

  • The dihydropyrimidinone (DHPM) core is a crucial scaffold in biologically active compounds.
  • The Biginelli reaction is a cornerstone for synthesizing DHPMs, with ongoing research focused on its optimization.

Purpose of the Study:

  • This review highlights advancements in the Biginelli reaction, particularly focusing on the application of polymer-supported catalysts.
  • To explore eco-friendly and efficient synthetic strategies for DHPM derivatives.

Main Methods:

  • Utilizing various polymer supports (organic, inorganic, hybrid) for catalytic systems.
  • Investigating magnetically recoverable catalysts, polymer-catalyst nanocomposites, and polymer-supported ionic liquids.
  • Exploring solvent-free, ultrasound, and microwave-assisted Biginelli reactions with polymer-supported catalysts.

Main Results:

  • Polymer-supported catalysts lead to improved product yields and simplified product isolation.
  • These methods offer enhanced catalyst recyclability, presenting a cost-effective approach.
  • Green chemistry principles are advanced through reduced hazardous conditions and efficient work-up procedures.

Conclusions:

  • Polymer-supported catalysts represent a significant advancement in Biginelli reaction methodology.
  • These catalytic systems provide sustainable and economically viable routes for synthesizing important DHPM derivatives.