4: Aldehydes and Ketones
- Page ID
- 558579
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\(\newcommand{\avec}{\mathbf a}\) \(\newcommand{\bvec}{\mathbf b}\) \(\newcommand{\cvec}{\mathbf c}\) \(\newcommand{\dvec}{\mathbf d}\) \(\newcommand{\dtil}{\widetilde{\mathbf d}}\) \(\newcommand{\evec}{\mathbf e}\) \(\newcommand{\fvec}{\mathbf f}\) \(\newcommand{\nvec}{\mathbf n}\) \(\newcommand{\pvec}{\mathbf p}\) \(\newcommand{\qvec}{\mathbf q}\) \(\newcommand{\svec}{\mathbf s}\) \(\newcommand{\tvec}{\mathbf t}\) \(\newcommand{\uvec}{\mathbf u}\) \(\newcommand{\vvec}{\mathbf v}\) \(\newcommand{\wvec}{\mathbf w}\) \(\newcommand{\xvec}{\mathbf x}\) \(\newcommand{\yvec}{\mathbf y}\) \(\newcommand{\zvec}{\mathbf z}\) \(\newcommand{\rvec}{\mathbf r}\) \(\newcommand{\mvec}{\mathbf m}\) \(\newcommand{\zerovec}{\mathbf 0}\) \(\newcommand{\onevec}{\mathbf 1}\) \(\newcommand{\real}{\mathbb R}\) \(\newcommand{\twovec}[2]{\left[\begin{array}{r}#1 \\ #2 \end{array}\right]}\) \(\newcommand{\ctwovec}[2]{\left[\begin{array}{c}#1 \\ #2 \end{array}\right]}\) \(\newcommand{\threevec}[3]{\left[\begin{array}{r}#1 \\ #2 \\ #3 \end{array}\right]}\) \(\newcommand{\cthreevec}[3]{\left[\begin{array}{c}#1 \\ #2 \\ #3 \end{array}\right]}\) \(\newcommand{\fourvec}[4]{\left[\begin{array}{r}#1 \\ #2 \\ #3 \\ #4 \end{array}\right]}\) \(\newcommand{\cfourvec}[4]{\left[\begin{array}{c}#1 \\ #2 \\ #3 \\ #4 \end{array}\right]}\) \(\newcommand{\fivevec}[5]{\left[\begin{array}{r}#1 \\ #2 \\ #3 \\ #4 \\ #5 \\ \end{array}\right]}\) \(\newcommand{\cfivevec}[5]{\left[\begin{array}{c}#1 \\ #2 \\ #3 \\ #4 \\ #5 \\ \end{array}\right]}\) \(\newcommand{\mattwo}[4]{\left[\begin{array}{rr}#1 \amp #2 \\ #3 \amp #4 \\ \end{array}\right]}\) \(\newcommand{\laspan}[1]{\text{Span}\{#1\}}\) \(\newcommand{\bcal}{\cal B}\) \(\newcommand{\ccal}{\cal C}\) \(\newcommand{\scal}{\cal S}\) \(\newcommand{\wcal}{\cal W}\) \(\newcommand{\ecal}{\cal E}\) \(\newcommand{\coords}[2]{\left\{#1\right\}_{#2}}\) \(\newcommand{\gray}[1]{\color{gray}{#1}}\) \(\newcommand{\lgray}[1]{\color{lightgray}{#1}}\) \(\newcommand{\rank}{\operatorname{rank}}\) \(\newcommand{\row}{\text{Row}}\) \(\newcommand{\col}{\text{Col}}\) \(\renewcommand{\row}{\text{Row}}\) \(\newcommand{\nul}{\text{Nul}}\) \(\newcommand{\var}{\text{Var}}\) \(\newcommand{\corr}{\text{corr}}\) \(\newcommand{\len}[1]{\left|#1\right|}\) \(\newcommand{\bbar}{\overline{\bvec}}\) \(\newcommand{\bhat}{\widehat{\bvec}}\) \(\newcommand{\bperp}{\bvec^\perp}\) \(\newcommand{\xhat}{\widehat{\xvec}}\) \(\newcommand{\vhat}{\widehat{\vvec}}\) \(\newcommand{\uhat}{\widehat{\uvec}}\) \(\newcommand{\what}{\widehat{\wvec}}\) \(\newcommand{\Sighat}{\widehat{\Sigma}}\) \(\newcommand{\lt}{<}\) \(\newcommand{\gt}{>}\) \(\newcommand{\amp}{&}\) \(\definecolor{fillinmathshade}{gray}{0.9}\)- 4.1: The Carbonyl Group
- This page introduces aldehydes and ketones, highlighting the carbonyl group's structure with carbon double-bonded to oxygen. It explains the positioning of the carbonyl group—the end of a carbon chain for aldehydes (-al) and the middle for ketones (-one), giving examples like methanal and propanone. The page also emphasizes property differences between the two functional groups and offers naming conventions, including alternatives for ketones.
- 4.2: Naming Aldehydes and Ketones
- This page discusses the naming and structural representation of aldehydes and ketones, covering both common and IUPAC naming systems. It provides examples for the first four aldehydes and details ketone naming conventions, outlining key rules for deriving IUPAC names and numbering the carbon chain based on the carbonyl group's position. The emphasis is on transitioning from traditional to systematic naming to improve the understanding of aldehyde and ketone structures.
- 4.3: Properties of Aldehydes and Ketones
- This page discusses the properties of aldehydes and ketones, highlighting their higher boiling points compared to ethers and alkanes due to their polar carbon-to-oxygen double bonds, but lower than alcohols due to hydrogen bonding. It notes their solubility in water for smaller molecules, their oxidative behaviors—where aldehydes can be oxidized to carboxylic acids, unlike ketones—distinctive odors of common aldehydes, and their solubility in organic solvents while being less dense than water.
- 4.4: Some Common Aldehydes and Ketones
- This page covers formaldehyde and acetaldehyde, detailing formaldehyde's use as a preservative and its health effects. It describes acetaldehyde's significance in organic synthesis, sugar fermentation, and alcohol metabolism. The page highlights the importance of ketones, especially acetone, as an industrial solvent and in human metabolism, while also noting various aldehydes and ketones that enhance flavors and odors in products, including their role in steroid hormones.
- 4.5: Oxidation of Aldehydes
- This page explains the similarities and differences between aldehydes and ketones, focusing on their carbonyl group. Aldehydes oxidize readily to carboxylic acids, while ketones are more resistant. Aldehydes can be identified using Tollens' reagent, which distinguishes them by producing a mirror effect, unlike ketones. Both types can undergo combustion but have distinct oxidation properties that make aldehydes easier to recognize.
- 4.6: Reduction of Aldehydes and Ketones
- This page outlines the map-building process for educational resources, highlighting the time required to find or create suitable materials. It explains LibreTexts' strategy of providing finished pages rather than waiting for completion, acknowledging that the current map is incomplete but actively being developed.
- 4.7: Addition of Alcohols - Hemiacetals and Acetals
- This page outlines the incremental development of maps, emphasizing the necessity for aligned materials. LibreTexts promotes making completed pages accessible rather than waiting for the entire project to finish. It acknowledges that while the mapping is a work in progress with some incomplete sections, efforts to finalize it are actively underway.