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Related Concept Videos

Radicals01:27

Radicals

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Roots, often written as radicals, identify the quantity that must be raised to a specific exponent to produce a given value. A radical expression consists of two main components: the radicand, which is the value placed inside the root symbol, and the index, which indicates the degree of the root being taken. The notation n√a indicates the principal nth root of a. If n equals 2, the operation is the square root, while n = 3 defines the cube root. When n is even, a negative radicand does...
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Radical Equations01:26

Radical Equations

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Radical equations are mathematical expressions in which the variable is found within a radical, most commonly a square root or cube root. These equations frequently arise in science, engineering, and real-world measurements involving nonlinear relationships. To solve a radical equation, the standard procedure is to isolate the radical expression and then eliminate the radical by raising each side to a power equal to the index of the radical. This process may lead to extraneous...
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Radical Reactivity: Nucleophilic Radicals01:16

Radical Reactivity: Nucleophilic Radicals

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Radicals adjacent to electron-donating groups are called nucleophilic radicals. These radicals readily react with electrophilic alkenes. The SOMO–LUMO interactions are the driving force for the reaction, where the high-energy SOMO of the electron-rich, nucleophilic radicals interacts with the low-energy LUMO of the electron-deficient, electrophilic alkenes. Such SOMO–LUMO interactions are the basis of reactive radical traps, affecting the selectivity in radical reactions. For...
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Radical Reactivity: Electrophilic Radicals01:02

Radical Reactivity: Electrophilic Radicals

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Radicals adjacent to electron‐withdrawing groups are called electrophilic radicals. These radicals readily react with nucleophilic alkenes. For example, the malonate radical, in which the radical center is flanked by two electron‐withdrawing groups, reacts readily with butyl vinyl ether, which consists of an electron‐donating oxygen substituent. The reaction between electrophilic malonate radical and nucleophilic vinyl ether is favored because the radical has a...
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Radical Autoxidation01:20

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The oxidation of an organic compound in the presence of air or oxygen is called autoxidation. For example, cumene reacts with oxygen to form hydroperoxide. Autoxidation involves initiation, propagation, and termination steps. Many organic compounds are susceptible to autoxidation—especially ethers in the presence of oxygen, which form hydroperoxides. Even though this reaction is slow, old ether bottles contain small amounts of peroxide, which leads to laboratory explosions during ether...
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Radical Formation: Overview01:03

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A bond can be broken either by heterolytic bond cleavage to form ions or homolytic bond cleavage to yield radicals. A fishhook arrow is used to represent the motion of a single electron in homolytic bond cleavage. There are two main sources from which radicals can be formed:
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Some radical queries.

T Ramasarma1

  • 1Department of Biochemistry, Indian Institute of Science, Bangalore 560-12, India. trs@biochem.iisc.ernet.in

Toxicology
|August 30, 2000
PubMed
Summary
This summary is machine-generated.

This study explores the interaction between antioxidants, found in spices like black pepper, and radicals. It presents key insights from a 1999 symposium held in Goa, India.

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Area of Science:

  • Pharmacology
  • Food Science
  • History of Science

Background:

  • Vasco da Gama's 15th-century voyage to India initiated spice trade, particularly black pepper.
  • Portuguese colonization of Goa followed, highlighting the region's historical significance in global trade.
  • Goa hosted a 1999 symposium focused on antioxidants, including those derived from spices.

Purpose of the Study:

  • To present views and queries on the interaction between antioxidants and radicals.
  • To highlight the role of natural products from spices as antioxidants.
  • To contextualize antioxidant research within historical trade routes and scientific gatherings.

Main Methods:

  • Review of scientific discourse from a 1999 symposium.
  • Identification of natural products from spices with antioxidant properties.
  • Exploration of antioxidant-radical interactions.

Main Results:

  • Discussion of various perspectives on antioxidant-radical interactions.
  • Identification of specific spices as sources of potent antioxidants.
  • Exploration of the chemical properties and biological relevance of spice-derived antioxidants.

Conclusions:

  • Antioxidants, particularly those from spices, play a crucial role in biological systems.
  • Understanding antioxidant-radical interactions is vital for health and disease research.
  • Historical trade routes underscore the long-standing importance of spices and their compounds.