Methyl Ketones
Methyl Ketones - Related Videos
03:09
Identification of Unknown Aldehydes and Ketones - Concepts
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2020
Aldehydes and Ketones Aldehydes and ketones have a carbonyl group (C=O) as a functional group. A ketone has two alkyl or aryl groups attached to the carbonyl carbon (RCOR’). The simplest ketone is acetone, which has two methyl groups attached to the carbonyl carbon (CH3COCH3). An aldehyde is similar to a ketone, except that instead of two side groups connected to the carbonyl carbon, they have at least one hydrogen (RCOH). The simplest aldehyde is formaldehyde (HCOH), as it has two hydrogens...
15:03
Identification of Unknown Aldehydes and Ketones - Student Protocol
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2020
Source: Lara Al Hariri and Ahmed Basabrain at the University of Massachusetts Amherst, MA, USA DNPH Test for Aromatic Aldehydes and KetonesExpand In this lab, you'll use the DNPH test, the Tollens' test, and the iodoform test to identify two unknown aldehydes or ketones. You'll use butanone and benzaldehyde as known compounds to confirm that the tests are working as expected. You'll start the lab with the DNPH test, which relies on the reaction between 2,4-dinitrophenylhydrazine, or DNPH,...
01:28
Multiple Halogenation of Methyl Ketones: Haloform Reaction
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2025
A method involving the transformation of methyl ketones to carboxylic acids using excess base and halogen is called the haloform reaction. It begins with the deprotonation of α hydrogen to form an enolate ion which reacts with the electrophilic halogen to give an α-halo ketone. The step continues until all the α protons are substituted to form a trihalomethyl ketone. The resulting molecule is unstable, and in the presence of a hydroxide base, it readily undergoes nucleophilic acyl substitution.
08:47
DNA Methylation Analysis
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2023
Methylation at CpG dinucleotides is a chemical modification of DNA hypothesized to play important roles in regulating gene expression. In particular, the methylation of clusters of methylation sites, called “CpG islands”, near promoters and other gene regulatory elements may contribute to the stable silencing of genes, for example, during epigenetic processes such as genomic imprinting and X-chromosome inactivation. At the same time, aberrant CpG methylation has been shown to be associated with...
21:24
Methylated DNA Immunoprecipitation
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Cited by 43 •
2009
This video demonstrates the protocol for methylated DNA immunoprecipitation (MeDIP). MeDIP is a two day procedure that selectively extracts methylated DNA fragments from a genomic DNA sample using antibodies with specificity for 5 -methylcytosine (anti-5 mC).
FAQs
Under basic conditions, hydrogen atoms on the carbon adjacent to the carbonyl can be removed to form an enolate, a reactive species. This transformation matters because it converts the methyl ketone into a form that can participate in subsequent organic reactions. The resulting reactivity makes these compounds useful as intermediates when chemists build more complex molecules.
In the haloform reaction, the methyl portion undergoes halogenation repeatedly before cleavage occurs. The sequence is significant because it links a recognizable structural feature to an analytical outcome, allowing chemists to use the reaction as a qualitative test. It also illustrates how changing the methyl group through successive reaction steps can ultimately promote bond cleavage.
The two main reaction pathways respond to different chemical purposes. Basic treatment exploits the acidic hydrogens next to the carbonyl by forming an enolate, whereas repeated halogenation followed by cleavage supports identification through the haloform reaction. Recognizing this difference helps chemists choose whether to emphasize methyl ketone reactivity for molecule construction or for qualitative analysis.
To apply the haloform reaction as an identification approach, chemists focus on the sequence rather than a single transformation: repeated halogenation is followed by cleavage. The outcome is interpreted as evidence associated with the methyl ketone functional group. This workflow connects structural reasoning with qualitative analysis, especially when the goal is to distinguish compounds by characteristic reactivity.
Solvent, fragrance, and flavor uses place methyl ketones in practical settings beyond reaction mechanisms. Their chemical behavior also allows them to function as intermediates in organic synthesis. These roles are complementary: a compound may be valued for a useful practical application in one context, while its reactivity makes it valuable for preparing more complex molecules in another.
In chemistry research, methyl ketones connect structure, reactivity, and analysis in one class of compounds. Their carbonyl-centered behavior supports enolate formation under basic conditions, while the haloform reaction provides a route for qualitative identification. Studying both responses helps relate molecular structure to experimental function, from detecting a functional group to planning steps toward more complex compounds.