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Related Concept Videos

Preparation of Diols and Pinacol Rearrangement01:57

Preparation of Diols and Pinacol Rearrangement

Compounds bearing two hydroxyl groups are known as diols. When the hydroxyl groups are located on adjacent carbon atoms, the diols are called vicinal diols or glycols. Under acidic conditions, vicinal diols undergo a specific reaction called pinacol rearrangement.
The reaction begins with transferring a proton from the acid catalyst to one of the hydroxyl groups, producing an oxonium ion.
Ions, Molecules, and Compounds01:23

Ions, Molecules, and Compounds

Ions - When an atom participates in a chemical reaction that results in the donation or acceptance of one or more electrons, the atom becomes positively or negatively charged. This frequently happens for most atoms to have a full valence shell. This can happen either by gaining electrons to fill a shell that is more than half-full or by giving away electrons to empty a shell that is less than half-full, thereby leaving the next smaller electron shell as the new, full valence shell. An atom with...
Prochirality02:05

Prochirality

The concept of prochirality leads to the nomenclature of the individual faces of a molecule and plays a crucial role in the enantioselective reaction. It is a concept where two or more achiral molecules react to produce chiral products. A typical process is the reaction of an achiral ketone to generate a chiral alcohol. Here, the achiral reactant reacts with an achiral reducing agent, sodium borohydride, to generate an equimolar mixture of the chiral enantiomers of the product. For example, an...
Structures of Aldehydes and Ketones01:04

Structures of Aldehydes and Ketones

Vanillin—a flavoring agent in vanilla, cinnamaldehyde—a molecule responsible for the distinct smell of cinnamon, and acetone—a strong-smelling ingredient in nail polish removers, all belong to a class of carbonyl compounds called aldehydes and ketones (Figure 1). Although both aldehydes and ketones contain the characteristic carbonyl (C=O) bond, their chemical structures vary with respect to the groups directly attached to the carbonyl carbon.
In aldehydes (Figures 1a and 1b), the carbonyl...
Molecular Models02:00

Molecular Models

Physical models representing molecular architectures of chemical compounds play essential roles in understanding chemistry. The use of molecular models makes it easier to visualize the structures and shapes of atoms and molecules.
Structure of Alkanes02:23

Structure of Alkanes

The formation of carbon-carbon bonds leading to the creation of the carbon chain is the basis of organic chemistry. August Kekulé and Archibald Scott Couper independently developed this idea of carbon chain formation.
Hydrocarbons are the simplest organic compounds composed of carbons and hydrogens. Based on the bond order between carbons, the hydrocarbons are further classified into alkanes, alkenes, and alkynes. 
Alkanes are the simplest hydrocarbons with sp3 hybrid carbon atoms. These sp3...

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Related Experiment Video

Updated: Jul 10, 2026

Versatile CO2 Transformations into Complex Products: A One-pot Two-step Strategy
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CH3 + O2 --> H2CO + OH revisited.

N K Srinivasan1, M-C Su, J V Michael

  • 1Chemistry Division, Argonne National Laboratory, Argonne, Illinois 60439, USA.

The Journal of Physical Chemistry. A
|October 20, 2007
PubMed
Summary

New experiments quantify the reaction rate between methyl radical (CH3) and oxygen (O2) at high temperatures. The findings confirm previous data, providing an updated rate constant for this important combustion reaction.

Area of Science:

  • Chemical Kinetics
  • Combustion Chemistry
  • Atmospheric Chemistry

Background:

  • The reaction between methyl radical (CH3) and oxygen (O2) is a critical step in combustion processes and atmospheric chemistry.
  • Accurate kinetic data for this reaction are essential for modeling and understanding complex chemical systems.

Purpose of the Study:

  • To experimentally determine the rate constant for the reaction CH3 + O2 --> H2CO + OH.
  • To investigate the reaction kinetics over a high-temperature range (1244-1502 K).

Main Methods:

  • Utilized reflected shock tube experiments.
  • Employed a White cell multipass optical system for OH-radical absorption measurements at 308 nm.

Main Results:

  • Obtained new kinetic data for the CH3 + O2 reaction.

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  • The results are in excellent agreement with previous experimental data from the same laboratory.
  • An updated Arrhenius expression for the rate constant was derived: k = (1.06 +/- 0.32) x 10(-12) exp(-6801 +/- 439 K/T) cm(3) molecule(-1) s(-1).

    • Conclusions:

    • The study provides a refined rate constant for the CH3 + O2 reaction, enhancing the accuracy of combustion models.
    • The consistency between new and previous data strengthens confidence in the reported kinetic parameters.
    • The findings contribute to a better understanding of methyl radical oxidation mechanisms.