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Related Concept Videos

Radical Substitution: Halogenation of Alkanes and Alkyl Substituents01:27

Radical Substitution: Halogenation of Alkanes and Alkyl Substituents

10.2K
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...
10.2K
Halogenation of Alkenes02:46

Halogenation of Alkenes

20.1K
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.
20.1K
Carboxylic Acids to Methylesters: Alkylation using Diazomethane01:33

Carboxylic Acids to Methylesters: Alkylation using Diazomethane

3.1K
Carboxylic acids react with diazomethane in an ether solvent via alkylation at the carboxylate oxygen atom to give methyl esters of the corresponding acid with excellent yields.
3.1K
Alkyl Halides02:45

Alkyl Halides

20.4K
Structural Properties
Alkyl halides are halogen-substituted alkanes wherein one or more hydrogen atoms of an alkane is replaced by a halogen atom such as fluorine, chlorine, bromine, or iodine. The carbon atom in an alkyl halide is bonded to the halogen atom, which is sp3-hybridized and exhibits a tetrahedral shape.
Unlike alkyl halides, compounds in which a halogen atom is bonded to an sp2 -hybridized carbon atom of a carbon-carbon double bond (C=C) are called vinyl halides. Whereas aryl...
20.4K
Acid Halides to Ketones: Gilman Reagent01:14

Acid Halides to Ketones: Gilman Reagent

4.1K
Lithium dialkyl cuprate, also known as Gilman reagents, selectively reduces acid halides to ketones. The acid chloride is treated with Gilman reagent at −78 °C in the presence of ether solution to produce a ketone in good yield.
As shown below, the mechanism proceeds in two steps. First, one of the alkyl groups of the reagent acts as a nucleophile and attacks the acyl carbon of the acid chloride to form a tetrahedral intermediate. This is followed by the reformation of the carbon–oxygen...
4.1K
SN2 Reaction: Kinetics02:14

SN2 Reaction: Kinetics

10.4K
Kinetic Studies and Significance
In a chemical reaction, a relationship exists between the concentration of reactants and the rate at which the reaction proceeds. The study to measure this relationship is known as the kinetics of a chemical reaction. Kinetic studies are used to deduce the rate law of a chemical reaction, which provides information about the species involved during the transition state of the rate-determining step. Thus, kinetic studies help to derive the mechanism of a...
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Updated: Feb 20, 2026

Accessing Valuable Ligand Supports for Transition Metals: A Modified, Intermediate Scale Preparation of 1,2,3,4,5-Pentamethylcyclopentadiene
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Accessing Valuable Ligand Supports for Transition Metals: A Modified, Intermediate Scale Preparation of 1,2,3,4,5-Pentamethylcyclopentadiene

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Methylene Chloride.

Jennan A Phillips1

  • 11 University of Alabama at Birmingham.

Workplace Health & Safety
|October 21, 2017
PubMed
Summary
This summary is machine-generated.

Methylene chloride, an industrial solvent in paint strippers, poses fatal risks. The EPA is considering limiting its use due to health hazards.

Keywords:
Occupational Safety and Health Administration (OSHA)acute illnessesgovernment regulationhealth educationoccupational hazardsoccupational health and safety programs

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Area of Science:

  • Environmental Science
  • Occupational Health
  • Toxicology

Background:

  • Methylene chloride is a common industrial solvent.
  • It is found in consumer products like paint strippers and degreasers.
  • Exposure poses significant health risks, including fatality.

Purpose of the Study:

  • To review the risks associated with methylene chloride exposure.
  • To inform regulatory decisions regarding its use.
  • To highlight the need for consumer protection.

Main Methods:

  • Literature review of existing studies on methylene chloride toxicity.
  • Analysis of regulatory actions in different countries.
  • Examination of EPA's proposed regulations.

Main Results:

  • Methylene chloride is widely used but dangerous without protection.
  • Several countries have banned its use.
  • The EPA has proposed restrictions on its application.

Conclusions:

  • Methylene chloride presents a severe public health and safety concern.
  • Regulatory action is necessary to mitigate exposure risks.
  • Further research into safer alternatives is warranted.