propyl propanesulfinate

Propyl propanesulfinate, also known as 1-propane sulfinic acid, propyl ester, is an organosulfur compound characterized by the presence of a sulfinic acid ester functional group attached to a propyl moiety. It appears as a chemical intermediate with a unique sensory profile dominated by sulfurous and onion-like notes. The compound belongs to a class of sulfur-containing esters often noted in flavor and fragrance chemistry for their potent and distinctive odors. Despite its notable sensory characteristics, propyl propanesulfinate is mainly referenced for informational and research purposes rather than for direct application in commercial products. Its chemical identity and structure can be verified through databases such as PubChem. The compound is typically synthesized via esterification reactions involving propanesulfinic acid precursors and propanol derivatives.

Propyl propanesulfinate occurs as a synthetic organosulfur ester and is not known to be naturally abundant. Its onion-like aroma and flavor attributes stem from the sulfur moiety, common among compounds that contribute to the characteristic scent of Allium species. Usage of this compound is restricted to informational and investigational contexts, with no authorized applications in fragrances or flavors due to regulatory and safety considerations. The compound is not listed for use under standards such as FEMA (Flavor and Extract Manufacturers Association, US), supporting its classification as a non-consumable, non-fragrance ingredient. Its potential lies primarily in scientific research on sulfur-containing aroma chemicals and their sensory impact.

Propyl propanesulfinate exhibits physicochemical properties typical of sulfinic acid esters, featuring moderate polarity due to the sulfinyl group and moderate hydrophobic character from the alkyl propyl chains. These properties influence its solubility profile, favoring polar solvents such as propylene glycol and water in trace concentrations. The compound possesses a significant vapor pressure relative to its molecular weight, enabling olfactory detection at very low concentrations. Its chemical stability is influenced by the sulfinic acid ester functionality, which can be sensitive to hydrolysis under strongly acidic or basic conditions. The strong sulfurous odor, reminiscent of fresh onion juice, reflects the molecular structure’s electronic characteristics and binding affinity to olfactory receptors responsive to volatile organosulfur compounds.

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Safety information

Hazards identification
Classification of the substance or mixture
GHS Classification in accordance with 29 CFR 1910 (OSHA HCS)
None found.
GHS Label elements, including precautionary statements
Pictogram
Hazard statement(s)
None found.
Precautionary statement(s)
None found.
Oral/Parenteral Toxicity:
Not determined
Dermal Toxicity:
Not determined
Inhalation Toxicity:
Not determined

Safety in use information

Category:
information only not used for fragrances or flavors
Recommendation for propyl propanesulfinate usage levels up to:
	not for fragrance use.
Recommendation for propyl propanesulfinate flavor usage levels up to:
	not for flavor use.

Safety references

None found