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para-methyl phenoxyacetaldehyde
para-methyl phenoxyacetaldehyde is a fragrance compound known for its floral, hay, and melon-like aroma, used predominantly in perfuming applications.
General Material Description
para-methyl phenoxyacetaldehyde is an aromatic aldehyde characterized by the molecular formula C9H10O2. It appears as a compound with a distinguished scent profile combining floral, hay, and melon notes, often accompanied by subtle ozone-like qualities. Known under various synonyms—including 2-(4-methylphenoxy)acetaldehyde and p-methylphenoxyacetaldehyde—this compound is linked with a controlled vocabulary entry in PubChem. It is principally sourced or synthesized for use in fragrance and perfuming applications due to its unique sensory attributes and functional properties. The compound’s distinct aroma contributes complexity to fragrance blends, enriching floral and green accords.
Occurrence, Applicability & Potential Uses
This compound is not widely reported as naturally occurring but is primarily valued for its application as a fragrance agent. para-methyl phenoxyacetaldehyde's scent profile, featuring fresh hay, floral, hyacinth, and melon nuances, makes it suitable for use in perfume compositions and related perfuming products. Additionally, it can impart a mild ozone-like character to olfactory blends. Under IFRA (Global) standards, its use is regulated to ensure safe incorporation into fragrance concentrates, with recommended maximum usage levels. Such regulatory frameworks support its widespread adoption within the fragrance industry, aligning safety and quality considerations with olfactive performance.
Physico-Chemical Properties Summary
The compound exhibits a boiling point near 242 to 243°C at standard atmospheric pressure, reflecting its moderate volatility. Its specific gravity ranges from approximately 0.988 to 0.995 at temperatures between 20 and 25°C, indicating a density slightly below that of water. The refractive index lies between 1.466 and 1.472 at 20°C, consistent with aromatic aldehydes. para-methyl phenoxyacetaldehyde demonstrates limited vapor pressure at 0.031 mmHg (25°C), suggesting slow evaporation rates under ambient conditions. The estimated octanol-water partition coefficient (log P) around 1.57 implies moderate lipophilicity, relevant to formulation behavior. Solubility is confirmed in alcohol solvents and water at low concentrations, while insoluble in pure water. Its flash point is approximately 24°C (converted from 76°F), offering information pertinent to safe handling and storage. These physical properties influence its performance and stability in fragrance systems.
FAQ
What is para-methyl phenoxyacetaldehyde and what are its key sensory characteristics?
para-Methyl phenoxyacetaldehyde is an aromatic aldehyde used primarily in fragrance formulations. It is recognized for its distinctive odor profile that includes fresh hay, floral notes such as hyacinth and lily, melon nuances, and a subtle ozone-like aspect. These sensory qualities make it valuable in creating complex and naturalistic fragrance accords. Chemically, it is known as 2-(4-methylphenoxy)acetaldehyde, with molecular formula C9H10O2, and is part of a class of phenoxyacetaldehydes used in perfuming.
How is para-methyl phenoxyacetaldehyde applied, and where does it occur or originate?
This compound is not typically found naturally but is synthesized for use as a fragrance agent. Its applications focus on imparting floral, hay, melon, and ozone-like scents in perfumes and other fragranced products. It enhances olfactory complexity and is utilized to evoke fresh and green aromatic accents. Due to its physical properties, it dissolves well in alcohol and certain solvents, enabling its incorporation into perfume concentrates. Regulatory standards such as IFRA (Global) guide its safe usage concentrations, supporting its role in commercial perfumery rather than flavoring or other industries.
What are the regulatory considerations and safety guidelines for using para-methyl phenoxyacetaldehyde?
According to IFRA (Global) recommendations, para-methyl phenoxyacetaldehyde has defined maximum usage levels, specifically up to 3.0% in fragrance concentrates. No GHS (Globally Harmonized System) hazard classifications have been identified for this compound under OSHA HCS (29 CFR 1910). Safety data indicate no established toxicity levels for oral, dermal, or inhalation exposure; however, standard handling precautions remain prudent. The compound is not approved for flavor use, and its use in perfumery is monitored through established fragrance industry safety assessments such as RIFM. Supporting information is accessible through various regulatory and scientific databases linked to its CAS number 67845-46-9.
US / EU / FDA / JECFA / FEMA / Scholar / Patents
| Google Scholar | Start search |
| Google Books | Start search |
| Google Patents | Start search |
| Perfumer & Flavorists | Start search |
| EU Patents | Start search |
| PubMeb | Start search |
| NCBI | Start search |
Other Information
| (IUPAC): | Atomic Weights of the Elements 2011 (pdf) |
| Videos: | The Periodic Table of Videos |
| tgsc: | Atomic Weights use for this web site |
| (IUPAC): | Periodic Table of the Elements |
| HMDB (The Human Metabolome Database): | Search |
| ChemSpider: | View |
General Material Information
| Preferred name | para-methyl phenoxyacetaldehyde |
| Trivial Name | 2-(4-Methylphenoxy)acetaldehyde |
| Short Description | acetaldehyde, 2-(4-methylphenoxy)- |
| Formula | C9 H10 O2 |
| CAS Number | 67845-46-9 |
| ECHA Number | 267-317-6 |
| FDA UNII | HQL6T929HS |
| Nikkaji Number | J287.483K |
| NMR Predictor | External link |
| Synonyms |
|
Suppliers
PhysChem Properties
| Material listed in food chemical codex | No |
| Molecular weight | 150.17709350586 |
| Specific gravity | @ 25 °C |
| Pounds per Gallon | 8.221 to 8.271 |
| Specific gravity | @ 20 °C |
| Pounds per Gallon | 8.239 to 8.289 |
| Refractive Index | 1.466 to 1.472 @ 20 °C |
| Boiling Point | 242 to 243°C @ 760 mm Hg |
| Acid Value | 5 max KOH/g |
| Vapor Pressure | 0.031 mmHg @ 25 °C |
| Flash Point TCC Value | 24.44 °C TCC |
| logP (o/w) | 1.573 est |
| Solubility | |
| alcohol | Yes |
| water, 3115 mg/L @ 25 °C (est) | Yes |
| water | No |
Organoleptic Properties
| Odor Type: Hay | |
| hay, melon, ozone, floral, marine, seaweed | |
| General comment | At 1.00 % in dipropylene glycol. powerful hay melon ozone floral |
Potential Uses
| Applications | |
| Odor purposes | Floral , Hay new mown hay , Hyacinth , Lily , Melon |
| Other purposes | Ozone |
| Cosmetic purposes | Perfuming agents |
Safety Information
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: | |||
| fragrance agents | |||
| RIFM Fragrance Material Safety Assessment: Search | |||
| IFRA Code of Practice Notification of the 49th Amendment to the IFRA Code of Practice | |||
| Recommendation for para-methyl phenoxyacetaldehyde usage levels up to: | |||
| 3.0000 % in the fragrance concentrate. | |||
| Recommendation for para-methyl phenoxyacetaldehyde flavor usage levels up to: | |||
| not for flavor use. | |||
Safety references
| EPI System: View |
| AIDS Citations:Search |
| Cancer Citations:Search |
| Toxicology Citations:Search |
| EPA Substance Registry Services (TSCA):67845-46-9 |
| EPA ACToR:Toxicology Data |
| EPA Substance Registry Services (SRS):Registry |
| Laboratory Chemical Safety Summary :105764 |
| National Institute of Allergy and Infectious Diseases:Data |
| 2-(4-methylphenoxy)acetaldehyde |
| Chemidplus:0067845469 |