Industrial Purity 3-Acetylpyridine Coa Specification Sheet

• Chemical Identity: CAS 350-03-8, Molecular Weight 121.14 g/mol, typically supplied as a clear liquid.
• Quality Standard: Assay verification via GC/HPLC ensures ≥99.0% industrial purity for synthesis.
• Procurement: Bulk pricing and validated COA documentation available from certified global manufacturers.

In the realm of fine chemical synthesis, maintaining strict control over intermediate quality is paramount for downstream reaction yields. 3-Acetylpyridine (CAS: 350-03-8) serves as a critical building block for the production of vitamins, pharmaceuticals, and agrochemicals. As a global manufacturer, NINGBO INNO PHARMCHEM CO.,LTD. specializes in delivering this heterocyclic compound with the consistency required for large-scale industrial applications. Understanding the technical specifications and verification methods associated with this chemical is essential for procurement managers and process chemists alike.

This compound, also known systematically as 1-pyridin-3-ylethanone, features a pyridine ring substituted with an acetyl group at the 3-position. Its reactivity profile makes it indispensable for condensation reactions and reduction processes. However, variations in the manufacturing process can lead to significant differences in impurity profiles, which may catalyze unwanted side reactions or reduce the efficacy of the final active pharmaceutical ingredient (API). Therefore, reliance on a comprehensive Certificate of Analysis (COA) is not merely administrative but a technical necessity.

Assay Verification Methods for ≥99.0% Purity

Ensuring the industrial purity of 3-Acetylpyridine requires robust analytical methodologies. Standard quality control protocols typically employ Gas Chromatography (GC) or High-Performance Liquid Chromatography (HPLC) to quantify the main component. For high-grade intermediates, the assay should consistently meet or exceed 99.0%. Lower purity grades often contain residual solvents or unreacted starting materials that can interfere with subsequent synthesis steps.

When evaluating potential suppliers, buyers should request chromatograms alongside the specification sheet. These documents provide visibility into the separation efficiency and the presence of close-eluting impurities. In our facilities, we utilize calibrated instrumentation to verify that each batch meets stringent thresholds before release. This level of scrutiny is particularly important when sourcing high-purity 3-Pyridyl methyl ketone, as even minor deviations can impact the stoichiometry of sensitive catalytic reactions.

Furthermore, physical constants serve as a secondary verification method. The boiling point of pure 3-Acetylpyridine is approximately 220 °C, and the melting point ranges between 11 °C and 13 °C. Deviations from these values often indicate the presence of isomeric impurities or water content that exceeds acceptable limits. Process chemists should correlate assay data with these physical properties to ensure the material behaves predictably during distillation or crystallization steps.

Impurity Profiles in Industrial Grades

The synthesis route employed to produce 3-Acetylpyridine significantly influences its impurity profile. Common synthetic pathways involve the oxidation of 3-ethylpyridine or Friedel-Crafts acylation strategies. Each route carries specific risks regarding byproduct formation. For instance, incomplete oxidation may leave behind 3-ethylpyridine, while over-oxidation can lead to nicotinic acid derivatives. These impurities are not only difficult to separate due to similar boiling points but can also act as catalyst poisons in downstream hydrogenation processes.

Water content is another critical parameter. As a hygroscopic liquid, 3-Acetylpyridine can absorb moisture during storage or transport. Elevated water levels can be detrimental to reactions involving moisture-sensitive reagents such as Grignard reagents or lithium aluminum hydride. Therefore, Karl Fischer titration results should always be reviewed within the COA. Typical specifications demand water content below 0.5% for anhydrous grades used in sensitive organic synthesis.

Additionally, heavy metal contamination must be monitored, especially for intermediates destined for pharmaceutical use. ICP-MS analysis is often conducted to ensure compliance with ICH Q3D guidelines. A reputable supplier will provide data on lead, arsenic, cadmium, and mercury levels. At NINGBO INNO PHARMCHEM CO.,LTD., we prioritize these safety parameters to ensure our clients meet regulatory requirements for drug substance manufacturing without additional purification burdens.

Requesting Validated Certificate of Analysis

The Certificate of Analysis (COA) is the definitive document confirming that a batch of chemical meets all agreed-upon specifications. For bulk procurement, the COA must be batch-specific, linking the test results to a unique lot number. Generic COAs that do not correspond to specific production runs should be rejected, as they do not guarantee the quality of the material received. Key data points on a valid COA include appearance, assay percentage, refractive index, density, and impurity limits.

Commercial considerations also play a role in documentation. While laboratory-scale prices may vary significantly based on packaging and handling fees, bulk price structures for industrial quantities are generally more stable and reflective of raw material costs and processing complexity. Buyers should negotiate terms that include full traceability documentation. This ensures that in the event of a quality dispute, there is a clear chain of custody and analytical evidence to support claims.

Below is a typical specification table for industrial-grade 3-Acetylpyridine, reflecting the standards expected from top-tier manufacturers:

Parameter	Specification	Test Method
Appearance	Clear colorless to light yellow liquid	Visual
Assay (GC Area %)	≥ 99.0%	Gas Chromatography
Water Content	≤ 0.5%	Karl Fischer Titration
Boiling Point	218 °C - 222 °C	Distillation
Refractive Index (n20/D)	1.540 - 1.550	Refractometry
Heavy Metals	≤ 10 ppm	ICP-MS

In conclusion, securing a reliable supply of 3-Acetylpyridine requires more than just checking a catalog number. It demands a thorough understanding of the chemical's physical properties, potential impurities, and the analytical methods used to verify quality. By partnering with established manufacturers who provide transparent COAs and adhere to strict production standards, pharmaceutical and agrochemical companies can mitigate supply chain risks. Whether for the synthesis of niacin derivatives or specialty fragrances, the integrity of the intermediate defines the success of the final product.