Industrial Purity Specifications for N-(3-Chloropropyl)Dibutylamine (CAS 36421-15-5)

• Meets stringent ≥98% industrial purity standards essential for high-yield API synthesis, particularly in dronedarone manufacturing.
• Validated via GC, HPLC, and NMR with full Certificate of Analysis (COA) to ensure batch-to-batch consistency and regulatory compliance.
• Produced via an optimized synthesis route from 3-(dibutylamino)propan-1-ol using thionyl chloride, achieving >94% reaction yield and minimal genotoxic impurities.

N-(3-Chloropropyl)dibutylamine (CAS 36421-15-5), also systematically named N-Butyl-N-(3-chloropropyl)butan-1-amine or N,N-Dibutyl-3-chloro-1-propanamine, is a critical chemical intermediate in the synthesis of dronedarone hydrochloride—an antiarrhythmic pharmaceutical agent. As a key building block, its quality directly influences the efficiency, safety, and regulatory viability of the final active pharmaceutical ingredient (API). Therefore, industrial purity specifications are not merely desirable—they are non-negotiable.

When sourcing high-purity N-(3-chloropropyl)dibutylamine, buyers must prioritize suppliers who enforce rigorous analytical controls, maintain documented synthesis routes, and provide comprehensive Certificates of Analysis (COAs). At NINGBO INNO PHARMCHEM CO.,LTD., we manufacture this compound to meet or exceed global pharmaceutical standards, ensuring reliability for both R&D and commercial-scale production.

Standard Purity Requirements for Pharmaceutical Intermediates

In the pharmaceutical supply chain, intermediates like 3-chloropropyl dibutylamine are subject to strict quality benchmarks defined by ICH Q7, USP, and EP guidelines. For N-(3-chloropropyl)dibutylamine, the industry-standard minimum purity is **≥98%**, though many API manufacturers now demand **≥99%** to mitigate risks associated with side reactions or purification bottlenecks.

Key purity-related parameters include:

• Assay (GC or HPLC): ≥98.0% (typically reported as area %)
• Residual solvents: Below ICH Class 2/3 limits (e.g., chloroform, dichloromethane)
• Water content (KF): ≤0.5%
• Heavy metals: ≤10 ppm
• Genotoxic impurities: Controlled per ICH M7 (e.g., residual alkyl chlorides, unreacted alcohols)

Impurities such as unreacted 3-(dibutylamino)propan-1-ol or over-chlorinated byproducts can significantly reduce coupling efficiency in subsequent steps of dronedarone synthesis. Even trace amounts may necessitate additional purification—increasing cost, reducing overall yield, and delaying time-to-market.

Analytical Methods for Verifying ≥98% Purity

At NINGBO INNO PHARMCHEM CO.,LTD., every batch of Dibutyl(3-chloropropyl)amine undergoes multi-modal analytical validation to confirm identity, purity, and stability. Our standard testing protocol includes:

Method	Purpose	Acceptance Criteria
Gas Chromatography (GC-FID)	Quantify main component and volatile impurities	Main peak ≥98.0%; no single impurity >0.5%
HPLC-UV	Detect non-volatile or thermally labile impurities	Consistent retention time; purity ≥98.0%
1H & 13C NMR	Confirm molecular structure and absence of major byproducts	Spectral match to reference; no extraneous peaks
Karl Fischer Titration	Measure water content	≤0.5% w/w
GC-MS / HRMS	Identify unknown impurities at trace levels	All impurities characterized and controlled

Each shipment is accompanied by a detailed Certificate of Analysis (COA), which includes lot-specific data for appearance (pale yellow liquid), boiling point (118–130 °C at 25 Torr), density (~0.899 g/cm³), and storage conditions (2–8 °C). This transparency ensures seamless integration into GMP-compliant workflows.

Impact of Impurities on Downstream API Synthesis

The role of N-(3-chloropropyl)dibutylamine as a pharmaceutical intermediate in dronedarone production cannot be overstated. It participates in nucleophilic substitution reactions where the chlorine atom is displaced by aromatic moieties. If the intermediate contains even minor impurities—such as residual alcohol, di-alkylated species, or hydrolyzed amine—the reaction kinetics can shift dramatically.

Common consequences of substandard purity include:

• Reduced reaction yield: Competing side reactions consume reagents without forming the desired product.
• Difficult purification: Co-eluting impurities complicate chromatographic separation, increasing solvent use and waste.
• API specification failure: Carryover impurities may violate ICH thresholds for genotoxic or elemental contaminants.
• Batch rejection: Regulatory agencies may reject entire API batches due to inadequate control of starting materials.

For example, if the synthesis route used to produce N-(3-chloropropyl)dibutylamine leaves behind traces of thionyl chloride or sulfur-containing byproducts, these can catalyze decomposition during storage or react unpredictably in later steps. Our optimized process minimizes such risks by employing stoichiometric precision, controlled reflux conditions, and thorough aqueous workup with potassium carbonate and sodium bicarbonate washes.

Manufacturing Process and Bulk Supply Capabilities

NINGBO INNO PHARMCHEM CO.,LTD. produces N-(3-chloropropyl)dibutylamine via a well-documented and scalable manufacturing process. Starting from high-purity 3-(dibutylamino)propan-1-ol, the compound is synthesized using thionyl chloride under anhydrous conditions. The reaction proceeds at reflux for 7 hours, yielding >94% of the target molecule as a pale yellow oil after extraction and drying.

This synthesis route has been refined over years of process chemistry expertise to ensure:

• High conversion efficiency
• Minimal formation of dichloro or elimination byproducts
• Excellent reproducibility across multi-kilogram batches
• Compatibility with ISO 9001 and GMP-aligned quality systems

We offer this chemical intermediate in flexible packaging options—from 100g laboratory quantities to multi-ton industrial shipments—with consistent ≥98% purity. Our current supply capacity exceeds **30 metric tons per month**, supported by dedicated production lines and real-time QC monitoring.

Global Pricing and Commercial Advantages

While market prices for N-(3-chloropropyl)dibutylamine vary based on purity and volume, our competitive bulk price structure reflects economies of scale and vertical integration. Unlike fragmented suppliers, we control the entire value chain—from raw material sourcing to final packaging—ensuring cost stability and supply security.

Compared to typical market rates (e.g., $50–$277/kg depending on grade and quantity), our pricing offers significant savings for long-term partners without compromising on quality. Every batch is traceable, fully documented, and compliant with international shipping regulations (HS Code 2921199990).

Conclusion: Quality You Can Build Your API On

In the high-stakes world of pharmaceutical manufacturing, the quality of your intermediates determines the success of your final product. N-(3-Chloropropyl)dibutylamine—whether referred to as 1-chloro-3-dibutylaminopropane, Dibutyl(3-chloropropyl)amine, or by its CAS number 36421-15-5—must meet exacting industrial purity standards to support efficient, safe, and compliant API synthesis.

As a leading global manufacturer based in China, NINGBO INNO PHARMCHEM CO.,LTD. delivers this critical intermediate with unwavering consistency, backed by robust analytics, scalable production, and customer-centric support. When your synthesis depends on precision, trust a partner who treats purity not as a target—but as a baseline.