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: 3489
• Other Identifiers: FL No. 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 and powdery odor, often associated with the scent of geraniums.

Citation hooks: FlavScents; PubChem; FEMA

2. Sensory Profile

Diphenyl oxide is known for its floral, powdery, and slightly sweet odor profile. It is often described as having a geranium-like scent with a moderate intensity and good diffusion. The compound is primarily used as an impact note in fragrance formulations, providing a clean and fresh floral character. While specific taste thresholds are not well-documented, its odor threshold is relatively low, making it effective even at minimal concentrations.

Citation hooks: FlavScents; peer-reviewed sensory literature

3. Natural Occurrence & Formation

Diphenyl oxide is not commonly found in nature but can be synthesized through the dehydration of phenol or the reaction of bromobenzene with phenol in the presence of a base. It is not typically classified under "natural flavor" or "natural fragrance" designations due to its synthetic origins. However, its floral character makes it a valuable component in recreating natural scents in perfumery.

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

4. Use in Flavors

Diphenyl oxide is occasionally used in flavor applications, particularly in floral and fruity profiles. It serves as a background realism enhancer, adding depth and complexity to flavor systems. Typical use levels in finished food or beverage products range from 0.1 to 5 ppm, with higher concentrations potentially leading to overpowering floral notes. It is stable under typical food processing conditions, including moderate heat and pH variations.

Citation hooks: FlavScents; FEMA GRAS documentation; formulation literature

5. Use in Fragrances

In the fragrance industry, diphenyl oxide is a versatile ingredient used across various fragrance families, including floral, oriental, and chypre. It acts as a modifier and impact note, contributing to the top and middle notes of a fragrance composition. Typical concentration ranges in perfumes are from 0.5% to 5%, depending on the desired intensity and character. Its volatility allows it to blend well with other floral and green notes, enhancing the overall fragrance profile.

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 No. 02.013.
• United Kingdom: Aligns with EU regulations post-Brexit.
• 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.

Explicit approvals and harmonized assumptions are common, though formulators should verify country-specific guidelines to ensure compliance.

Citation hooks: FEMA; EFSA; national authority publications

7. Toxicology, Safety & Exposure Considerations

• Oral Exposure: Diphenyl oxide has a low acute toxicity profile, with an ADI not clearly established. It is generally considered safe at typical flavor use levels.
• Dermal Exposure: In fragrance applications, it may cause mild irritation or sensitization in sensitive individuals. IFRA provides guidelines on safe use concentrations.
• Inhalation Exposure: Due to its volatility, inhalation exposure is possible, but occupational exposure limits are generally not exceeded in typical use scenarios.

Risk profiles are similar between food and fragrance applications, with safety primarily ensured through adherence to recommended use levels.

Citation hooks: EFSA; FEMA; PubChem; toxicology literature

8. Practical Insights for Formulators

Diphenyl oxide is valued for its ability to impart a clean, floral character to both flavors and fragrances. It synergizes well with other floral and green notes, enhancing the overall complexity of a formulation. Common pitfalls include overuse, which can lead to an overpowering scent, and underuse, which may result in a lack of desired floral impact. Formulators should balance its concentration carefully to achieve the intended sensory effect.

Citation hooks: FlavScents; industry practice

9. Confidence & Data Quality Notes

The data on diphenyl oxide is well-established, with comprehensive sensory and regulatory information available. Industry practices are well-documented, though some regional regulatory nuances may require further verification. Known data gaps are minimal, primarily related to specific toxicological 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 2026-03-30 13:56:44 GMT (p2)