4-Methylphenylacetaldehyde dimethyl acetal
4-Methylphenylacetaldehyde dimethyl acetal (CAS 42866-91-1), with the molecular formula C11H16O2 and a molecular weight of 180.24 g/mol, is a valuable organic building block. It functions as a protected form of 4-methylphenylacetaldehyde. This acetal is primarily utilised in organic synthesis as an intermediate for creating more complex molecules. Its reliable properties make it suitable for various chemical research and development applications.
- IUPAC
- 1-(2,2-Dimethoxyethyl)-4-methylbenzene,2-(4-Methylphenyl)acetaldehyde dimethyl acetal

Organic Synthesis Intermediate
Serves as a protected aldehyde in multi-step syntheses, allowing for selective reactions at other sites within a molecule. It is a key building block for creating various organic compounds.
Research and Development
Utilised in academic and industrial laboratories for exploring new synthetic pathways and developing novel chemical entities. Its structure lends itself to diverse reaction schemes.
Fine Chemical Manufacturing
Employed in the synthesis of speciality chemicals and pharmaceutical intermediates where precise control over aldehyde functionality is required.
| Molecular weight | 180.24 |
|---|---|
| Empirical formula | C11H16O2 |
| Assay | 95% |
| Density | 0.949 g/mL at 25 °C |
| Refractive index | n20/D 1.495 |

Hazard statements
- H302Harmful if swallowed
- H315Causes skin irritation
- H319Causes serious eye irritation
- H335May cause respiratory irritation
Precautionary statements
- P261Avoid breathing dust, fume, gas or vapours
- P305IF IN EYES
| Flash point | 98 °C / 208.4 °F |
|---|---|
| Water hazard class (WGK, DE) | 2 |
| Hazard codes (EU) | Xn |
| Risk statements (R) | 22-36/37/38 |
| Safety statements (S) | 26-36/37/39-45 |
Hazard information is provided for guidance. Always consult the product Safety Data Sheet (SDS), available on request, before handling.
Documentation
Every batch ships with a Certificate of Analysis covering assay, identity and purity; the grade is confirmed against your enquiry. Safety Data Sheets and technical data sheets are available on request.
Supply & logistics
Samples for technical evaluation; bulk MOQ by grade and packaging. In-stock material ships in 7–10 working days, worldwide, with full export documentation.
What is 4-Methylphenylacetaldehyde dimethyl acetal used for?
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4-Methylphenylacetaldehyde dimethyl acetal (CAS 42866-91-1) is primarily used as an intermediate in organic synthesis. It acts as a protected form of the corresponding aldehyde, enabling selective chemical transformations in the construction of more complex organic molecules.
What are the CAS number and formula for 4-Methylphenylacetaldehyde dimethyl acetal?
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The CAS number for 4-Methylphenylacetaldehyde dimethyl acetal is 42866-91-1, and its empirical formula is C11H16O2.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies 4-Methylphenylacetaldehyde dimethyl acetal with a minimum assay of 95%. This product is typically considered a technical or research grade, and TSS does not represent it as USP, BP, EP, or any other pharmacopoeia grade.
What are the safety and handling precautions for this chemical?
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This compound is classified as a Warning with hazard statements H302 (Harmful if swallowed), H315 (Causes skin irritation), H319 (Causes serious eye irritation), and H335 (May cause respiratory irritation). Always handle with appropriate personal protective equipment, including gloves, eye protection, and ensure adequate ventilation. Avoid ingestion, skin contact, and inhalation. Refer to the Safety Data Sheet (SDS) for comprehensive information.
How is 4-Methylphenylacetaldehyde dimethyl acetal packed, shipped, and exported?
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Tech Serve Solutions offers 4-Methylphenylacetaldehyde dimethyl acetal in various packaging sizes suitable for laboratory and industrial use. We are experienced in global shipping and export, ensuring compliance with all relevant regulations for chemical transportation.
How can I request a sample or a quote for 4-Methylphenylacetaldehyde dimethyl acetal?
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To request a sample or a quotation for 4-Methylphenylacetaldehyde dimethyl acetal, please contact our sales team through the website or by phone. Provide your specific requirements, including quantity and delivery location.
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