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Related Concept Videos

Radical Substitution: Halogenation of Alkanes and Alkyl Substituents01:27

Radical Substitution: Halogenation of Alkanes and Alkyl Substituents

In the presence of heat or light, alkanes react with molecular halogens to form alkyl halides by a substitution reaction called radical halogenation. This reaction has three steps: initiation, propagation, and termination, as seen in the radical chlorination of methane to produce methyl chloride.
In the initiation step of the reaction, the chlorine molecule undergoes homolytic cleavage in the presence of light or heat, forming two highly reactive chlorine radicals. Propagation occurs in two...
Radical Substitution: Allylic Chlorination01:31

Radical Substitution: Allylic Chlorination

Typically, when alkenes react with halogens at low temperatures, an addition reaction occurs. However, upon increasing the temperature or under reaction conditions that form radicals, providing a low but steady concentration of halogen radicals, allylic substitution reaction is favored. This is because allylic hydrogens are very reactive as the formed intermediate is resonance stabilized. For example, when propene is treated with chlorine in the gas phase at 400 °C, it undergoes allylic...
Prevention of Further Absorption of Poison01:14

Prevention of Further Absorption of Poison

In cases of acute poisoning, the primary objective is to prevent further absorption of the toxic substance into the body. Immediate interventions using various decontamination techniques targeting the gastrointestinal (GI) tract can achieve this. Decontamination is crucial to prevent poison from entering the systemic circulation, which involves washing affected areas with water and mild soap and removing contaminated clothing. Once external decontamination is done, attention must be turned to...
Reactions at the Benzylic Position: Halogenation01:11

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Benzylic halogenation takes place under conditions that favor radical reactions such as heat, light, or a free radical initiator like peroxide.
Carboxylic Acids to Acid Chlorides01:18

Carboxylic Acids to Acid Chlorides

Carboxylic acids react with SOCl2 or PCl5 to form acid chlorides. Amongst the carboxylic acid derivatives, acid chlorides are the most reactive and synthetically important derivatives. They are useful reagents for Friedel–Crafts acylation of some aromatic compounds.
Halogenation of Alkenes02:46

Halogenation of Alkenes

Halogenation is the addition of chlorine or bromine across the double bond in an alkene to yield a vicinal dihalide. The reaction occurs in the presence of inert and non-nucleophilic solvents, such as methylene chloride, chloroform, or carbon tetrachloride.
Consider the bromination of cyclopentene. Molecular bromine is polarized in the proximity of the π electrons of cyclopentene. An electrophilic bromine atom adds across the double bond, forming a cyclic bromonium ion intermediate.

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The Portable Chemical Sterilizer (PCS), D-FENS, and D-FEND ALL: Novel Chlorine Dioxide Decontamination Technologies for the Military
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Chlorine truck attack consequences and mitigation.

Anthony Michael Barrett1, Peter J Adams

  • 1ABS Consulting, 1525 Wilson Blvd., Ste. 625, Arlington, VA 22209, USA. abarrett@absconsulting.com

Risk Analysis : an Official Publication of the Society for Risk Analysis
|March 15, 2011
PubMed
Summary
This summary is machine-generated.

An intentional chlorine release could cause thousands of fatalities. Effective emergency response and protective measures, like sheltering, can significantly reduce these deaths.

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Area of Science:

  • Environmental Science
  • Public Health
  • Chemical Engineering

Background:

  • Intentional chemical releases pose significant public health risks.
  • Chlorine gas is a hazardous substance with potential for mass casualties.

Purpose of the Study:

  • To estimate potential fatalities from a large-scale intentional chlorine release in an urban setting.
  • To evaluate the impact of different response strategies and environmental conditions on casualty numbers.

Main Methods:

  • Development and application of an integrated modeling system.
  • Incorporation of public response, chemical source term, atmospheric dispersion, building air exchange, and dose-response models.
  • Simulation of a 17-ton chlorine release from a tank truck in a generic urban area.

Main Results:

  • Estimated fatalities range from approximately 4,000 to 30,000, depending on the dose-response model and wind conditions (2.5 m/sec, stability class F).
  • Individuals outdoors, despite representing a small fraction of the population, account for a disproportionately high percentage of fatalities (60-90%).
  • Favorable weather conditions can reduce fatalities by 50-90%; protective measures can decrease fatalities by 50% or more.

Conclusions:

  • The study highlights the severe threat posed by intentional chlorine releases.
  • Rapid and effective emergency responses, including sheltering in place and evacuation, are critical for mitigating casualties.
  • Varying weather conditions and the implementation of specific protective measures significantly influence the outcome of such events.