Pinene Oxide Fragrance Intermediate | Aure Chemical

Alpha-pinene oxide is a reactive intermediate that connects terpene chemistry to downstream fragrance chemistry. Its value in a project depends on the conversion route and the quality of the required product, so sourcing it calls for a process specification rather than a direct-perfumery sample brief.

This guide focuses on alpha-pinene oxide, CAS 1686-14-2, listed by Aure Chemical. It explains its relationship to campholenic aldehyde and the information a buyer should define before qualifying a feedstock grade.

Recognize the epoxide function

An epoxide is a three-membered cyclic ether. In alpha-pinene oxide, this reactive function is part of a terpene-derived structure. The term pinene oxide fragrance intermediate describes a role in chemical conversion; it should not be read as a recommendation to add the material directly to a finished perfume.

Keep alpha-pinene oxide distinct from alpha-pinene and other oxygenated terpene derivatives in the purchasing record. Specify the exact identity, any required stereochemical composition and the analytical basis for acceptance.

Understand the connection to campholenic aldehyde

Published research demonstrates the rearrangement of alpha-pinene oxide to campholenic aldehyde. The 2004 study by Vicevic and colleagues investigated a supported catalyst in a continuous spinning-disc reactor and examined how operating variables affected conversion and selectivity.

A 2014 study by Stekrova and colleagues examined iron-supported catalysts and reported that catalyst acidity strongly influenced activity and selectivity. These studies establish the chemical connection while showing that the product distribution depends on the catalytic system and process conditions.

For a buyer, the practical implication is to distinguish conversion from selectivity. Consuming the epoxide does not necessarily mean that all converted material becomes the desired aldehyde. Qualification should consider the amount and quality of the target product, the accompanying products and the requirements for downstream separation.

Specify the downstream product precisely

Aure Chemical also lists Campholenic Aldehyde under CAS 4501-58-0. The NIST identity record for that number specifies an R stereochemical identity. A project using alpha-pinene oxide to produce campholenic aldehyde should therefore define its target identity and stereochemical requirements explicitly.

Do not assume that a general literature reference to campholenic aldehyde proves equivalence to the listed commercial material. The process team should confirm the analytical identity of its product and the specification needed for the next step.

Turn the route requirements into a feedstock specification

Ask which attributes of alpha-pinene oxide need control for the proposed route. Assay is a starting point, but the presence of residual alpha-pinene, other oxygenated materials, water or trace impurities may require attention if qualification demonstrates an effect on the process.

Agree methods and limits rather than requesting an undefined maximum purity. If stereochemical composition matters, include it as a separate requirement. Retain the chromatographic data or other analytical records needed to compare qualification samples with subsequent deliveries.

Qualify the grade before scaling procurement

Use representative samples to compare the offered grade in the intended process. Record conversion, selectivity, downstream product quality and any separation burden. A repeatable feedstock comparison is more useful than comparing headline assays from different analytical methods.

Before receiving material, obtain the current safety data sheet and product specification. Handling, storage and packaging requirements should follow those documents and the site's process assessment. Any shelf-life or retest requirement should be agreed for the quoted grade.

Request alpha-pinene oxide for a defined project

Provide Aure Chemical with CAS 1686-14-2, the downstream application, required specification, qualification quantity, expected commercial volume and destination. Include any stereochemical or documentation requirements. Contact Aure Chemical to discuss the listed intermediate and quotation details.

For the broader procurement framework, see Fragrance Ingredients: Chemical Families and Procurement. For the distinction between aldehydes selected for odor and those sourced for further conversion, see the fragrance aldehyde guide.

Technical references

• Vicevic et al 2004 pinene oxide rearrangement study

• Stekrova et al 2014 selectivity study

• NIST campholenic aldehyde stereochemical identity record