Cyclic Aldehydes
Cyclic Aldehydes - Related Videos
08:37
Cyclic Voltammetry (CV)
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2023
Source: Laboratory of Dr. Kayla Green — Texas Christian University A Cyclic Voltammetry (CV) experiment involves the scan of a range of potential voltages while measuring current. In the CV experiment, the potential of an immersed, stationary electrode is scanned from a predetermined starting potential to a final value (called the switching potential) and then the reverse scan is obtained. This gives a 'cyclic' sweep of potentials and the current vs. potential curve derived from the data is...
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...
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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,...
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Structures of Aldehydes and Ketones
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2023
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...
01:16
IUPAC Nomenclature of Aldehydes
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2023
Aldehydes are named based on the systematic nomenclature rules set by the IUPAC. For acyclic aldehydes, the longest carbon chain containing the aldehydic (–CHO) group is considered the parent chain. The aldehyde is named by replacing the last letter “e” in the hydrocarbon name with “al”. For instance, a simple, seven-carbon-membered acyclic aldehyde is called heptanal, derived from heptane. The carbon chain is numbered starting from the aldehydic carbon, although the aldehydic carbon’s locant...
FAQs
The carbonyl carbon carries an electron-deficient center, so it can accept an electron pair from a nucleophile. Addition at this site changes the carbonyl functionality and creates a new connection within the molecule. Because the aldehyde is attached to a ring, the substrate’s cyclic framework remains relevant to the resulting structure, making ring geometry part of reaction planning in organic synthesis.
Oxidation and reduction direct the aldehyde toward different functional groups. Oxidation converts the aldehyde into a carboxylic acid, whereas reduction produces a primary alcohol. These outcomes change the molecule’s functional behavior and provide distinct intermediates for synthesis. Selecting between them depends on whether an acid or alcohol functionality is needed in the target structure.
Condensation with nitrogen-containing reagents provides a reaction pathway distinct from oxidation or reduction. Instead of producing a carboxylic acid or primary alcohol, this transformation introduces nitrogen into the resulting product. It is useful when synthesis requires a nitrogen-containing functional molecule, while the existing ring framework retains structural features that can influence the product’s properties.
Ring geometry and substituent arrangement can influence selectivity, stereochemistry, and product properties. Selectivity concerns which reaction outcome or product is favored, whereas stereochemistry concerns the three-dimensional arrangement in that product. Consequently, cyclic aldehydes with different structural arrangements may behave differently in synthesis, even when they contain the same aldehyde functionality.
Reaction planning begins by matching the desired product functionality to an available aldehyde transformation. Nucleophilic addition uses the electrophilic carbonyl center, oxidation targets a carboxylic acid, reduction targets a primary alcohol, and condensation with nitrogen-containing reagents gives a nitrogen-containing outcome. Ring geometry and substituent arrangement then help assess expected selectivity and stereochemical consequences.
Their combination of aldehyde reactivity and a constrained ring framework supports the preparation of diverse functional molecules. Cyclic aldehydes contribute to synthetic routes for pharmaceuticals, fragrances, natural-product derivatives, and other compounds with useful molecular properties. The aldehyde group offers several transformation options, while the ring and substituent arrangement help shape the structure and behavior of the final product.
Researchers can evaluate more than the identity of the functional group formed. A transformation may be considered in terms of its selectivity, the stereochemistry of the product, and the product’s resulting properties. These factors show how the aldehyde reaction and the cyclic framework work together, helping chemists judge whether the product suits a pharmaceutical, fragrance, natural-product, or other synthetic objective.