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IUPAC Nomenclature of Aldehydes

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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...

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This lesson delves into the aldol condensation catalyzed by bases, where aldols undergo dehydration to enals. As shown in Figure 1, the β-hydroxy aldehyde formed in a base-catalyzed aldol addition reaction dehydrates on heating to yield an unsaturated carbonyl product, which is commonly referred to as an enal.

IR and UV–Vis Spectroscopy of Aldehydes and Ketones

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Infrared spectroscopy, also known as vibrational spectroscopy, is mainly used to determine the types of bonds and functional groups in molecules. In aldehydes and ketones, the carbonyl (C=O) bond shows an absorption around 1710 cm-1. The C=O bond vibration of an aldehyde occurs at lower frequencies than that of a ketone. In addition to the C=O absorption in an aldehyde, the aldehydic C–H bond also gives two peaks in the 2700–2800 cm-1 range. This absorption, coupled with the C=O stretching, is...

Dehydration of Aldols to Enones: Acid-Catalyzed Aldol Condensation

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As shown in Figure 1, under acidic conditions, the β-hydroxy ketone undergoes dehydration via an E1 elimination reaction to form an enone.

NMR Spectroscopy and Mass Spectrometry of Aldehydes and Ketones

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In aldehydes, the hydrogen atom connected to the carbonyl carbon helps distinguish aldehydes from other carbonyl compounds using ¹H NMR spectroscopy. The closeness of aldehydic hydrogen to the electrophilic carbonyl carbon highly deshields the hydrogen atom causing its signal to appear around 10 ppm in the ¹H NMR spectra. α hydrogens split the aldehydic proton signal, which helps identify the number of α hydrogens in the molecule. For instance, one α hydrogen creates a doublet for an aldehydic...

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Wilhelm Rudolph Fittig discovered the pinacol coupling reaction in 1859. It is a radical dimerization reaction and involves the reductive coupling of aldehydes or ketones in the presence of hydrocarbon solvent to yield vicinal diols.

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Fragrance material review on dehydrolinalool.

A Lapczynski¹, S P Bhatia, C S Letizia

¹Research Institute for Fragrance Materials Inc., Woodcliff Lake, NJ 07677, USA. alapczynski@rifm.org

Food and Chemical Toxicology : an International Journal Published for the British Industrial Biological Research Association

|July 22, 2008

Summary

This review examines the toxicologic and dermatologic safety of dehydrolinalool, a common fragrance ingredient. It provides a comprehensive safety assessment for its use in consumer products.

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Area of Science:

Toxicology
Dermatology
Fragrance Chemistry

Background:

Dehydrolinalool is widely utilized as a fragrance ingredient in various consumer products.
Understanding its toxicologic and dermatologic profile is crucial for consumer safety.
Previous assessments may not encompass the full scope of its application.

Purpose of the Study:

To conduct a thorough toxicologic and dermatologic review of dehydrolinalool.
To evaluate the safety of dehydrolinalool when used as a fragrance ingredient.
To consolidate existing data and identify potential areas for further research.

Main Methods:

Comprehensive literature search of toxicologic and dermatologic studies.
Analysis of data on skin irritation, sensitization, and systemic toxicity.
Review of regulatory guidelines and industry standards for fragrance ingredients.

Main Results:

The review synthesizes available data on the safety of dehydrolinalool.
Identifies key toxicologic endpoints and dermatologic effects.
Highlights the concentrations and exposure scenarios relevant to consumer use.

Conclusions:

Dehydrolinalool demonstrates a specific safety profile based on current evidence.
Its use as a fragrance ingredient is considered safe under typical exposure conditions.
Further research may be warranted for specific high-exposure scenarios or sensitive populations.