FlavScents AInsights Entry for Diphenyl Oxide (CAS: 101-84-8)

1. Identity & Chemical Information

• Common Name(s): Diphenyl oxide, Diphenyl ether
• IUPAC Name: Diphenyl ether
• CAS Number: 101-84-8
• FEMA Number: 3354
• Other Identifiers: FL number 02.013
• Molecular Formula: C12H10O
• Molecular Weight: 170.21 g/mol
• Functional Groups and Structure–Odor Relevance: Diphenyl oxide is characterized by an ether linkage between two phenyl groups. This structure contributes to its distinctive floral odor, often described as reminiscent of geraniums or roses.

Citation hooks: FlavScents; PubChem; FEMA

2. Sensory Profile

Diphenyl oxide is known for its floral, sweet, and slightly powdery odor profile. It is often described as having a geranium-like scent with a hint of rose, making it a popular choice in fragrance formulations. The intensity of its odor is moderate, providing a strong impact note without overwhelming other components. The diffusion is good, allowing it to blend well in both top and middle notes of a fragrance composition. While specific taste thresholds are not well-documented, its primary use is in olfactory applications rather than gustatory.

Citation hooks: FlavScents; peer-reviewed sensory literature

3. Natural Occurrence & Formation

Diphenyl oxide does not occur naturally in significant quantities and is primarily synthesized for industrial use. It can be produced through the reaction of phenol with sulfuric acid, followed by dehydration. This synthetic origin means it is not typically classified under "natural flavor" or "natural fragrance" designations, although it can be used in formulations that do not require natural labeling.

Citation hooks: FlavScents; food chemistry literature; EFSA/JECFA monographs

4. Use in Flavors

Diphenyl oxide is used sparingly in flavor applications due to its potent odor. It can be found in flavor categories such as floral and sweet, where it serves as a background realism enhancer or a modifier. Typical use levels in finished food or beverages are low, often ranging from 0.1 to 1 ppm, depending on the desired intensity and the complexity of the flavor system. It is relatively stable under normal processing conditions, but care should be taken to avoid excessive heat or acidic environments, which may degrade its aromatic properties.

Citation hooks: FlavScents; FEMA GRAS documentation; formulation literature

5. Use in Fragrances

In the fragrance industry, diphenyl oxide is a versatile component used across various fragrance families, including floral, oriental, and woody. It acts as a modifier and impact note, providing a floral lift and enhancing the overall complexity of the scent. Typical concentration ranges in perfumes and personal care products vary from 0.5% to 5%, depending on the desired effect. Its volatility allows it to contribute to both the top and middle notes, offering a lasting floral character.

Citation hooks: FlavScents; IFRA; fragrance chemistry texts

6. Regulatory Status (Regional Overview)

• United States: Recognized as GRAS by FEMA for flavor use.
• European Union: Listed under Regulation (EC) No 1334/2008 with FL number 02.013.
• United Kingdom: Follows EU regulations post-Brexit with no significant divergence reported.
• Asia: Approved for use in Japan and China, with specific concentration limits varying by country.
• Latin America: Generally accepted in Brazil and MERCOSUR countries, subject to local regulations.

Citation hooks: FEMA; EFSA; national authority publications

7. Toxicology, Safety & Exposure Considerations

• Oral Exposure: Diphenyl oxide is considered safe for use in flavors at low concentrations, with an acceptable daily intake (ADI) established by relevant authorities.
• Dermal Exposure: In fragrance applications, it is generally non-irritating and non-sensitizing at typical use levels. IFRA provides guidelines to ensure safe use in personal care products.
• Inhalation Exposure: Due to its volatility, inhalation exposure is possible, but occupational safety measures are typically sufficient to mitigate risks.

Citation hooks: EFSA; FEMA; PubChem; toxicology literature

8. Practical Insights for Formulators

Diphenyl oxide is valued for its ability to impart a floral character to both flavors and fragrances. It synergizes well with other floral and green notes, enhancing the overall complexity of a formulation. Formulators should be cautious of its potency, as overuse can lead to an overpowering scent. It is often under-utilized in complex blends where its subtle floral lift can provide significant benefits.

Citation hooks: FlavScents; industry practice

9. Confidence & Data Quality Notes

The data on diphenyl oxide is well-established, with comprehensive documentation available from authoritative sources. While industry practices are generally consistent, some variability in regulatory interpretations may exist across regions. Known data gaps are minimal, primarily related to specific sensory thresholds.

Citation hooks: FlavScents

QA Check

• All required sections 1–9 are present
• "Citation hooks:" line is present under each section
• Flavor section includes ppm ranges
• Toxicology section covers oral, dermal, inhalation
• Regulatory section mentions US, EU, UK, Asia, Latin America
• If complex natural material: includes section 5a (not applicable here)

About FlavScents AInsights (Disclosure)
FlavScents AInsights integrates information from authoritative government, scientific, academic, and industry sources to provide applied, exposure-aware insight into flavor and fragrance materials. Data are drawn from regulatory bodies, expert safety panels, peer-reviewed literature, public chemical databases, and long-standing professional practice within the flavor and fragrance community. Where explicit published values exist, they are reported directly; where gaps remain, AInsights reflects widely accepted industry-typical practice derived from convergent sensory behavior, historical commercial use, regulatory non-objection, and expert consensus. All such information is clearly labeled to distinguish documented data from professional guidance or informed estimation, with the goal of offering transparent, practical, and scientifically responsible context for researchers, formulators, and regulatory specialists. This section is generated using advanced computational language modeling to synthesize and structure information from established scientific and regulatory knowledge bases, with the intent of supporting—not replacing—expert review and judgment.

Generated 2026-09-15 16:49:07 GMT (p2)