4,4′-Bipiperidyl Dihydrochloride: Properties & Lab Use Guide

4,4′-Bipiperidyl dihydrochloride is a bis-piperidine diamine salt widely used as a synthetic intermediate and ligand precursor in organic and medicinal chemistry research.

Chemical Name

4,4′-Bipiperidyl dihydrochloride

SKU

B301400

Molecular Formula (free base)

C10H20N2

Molecular Formula (dihydrochloride salt)

C10H22Cl2N2

Molecular Weight (dihydrochloride)

Approximately 241.20 g/mol

Appearance

White to off-white crystalline powder

Solubility

Soluble in water; sparingly soluble in ethanol

Storage Conditions

Store at room temperature in a tightly sealed container, away from moisture and light

Chemical Identity and Physical Properties

4,4′-Bipiperidyl dihydrochloride (Aladdin SKU: B301400) is the dihydrochloride salt form of 4,4′-bipiperidine, a symmetric molecule comprising two piperidine rings connected at their 4-positions via a C–C bond. Both secondary amine nitrogen atoms are protonated as hydrochloride salts, rendering the compound highly water-soluble and stable under standard laboratory conditions.

The free base (4,4′-bipiperidine) has the molecular formula C₁₀H₂₀N₂, while the dihydrochloride salt form has the formula C₁₀H₂₂Cl₂N₂ with an approximate molecular weight of 241.20 g/mol. The compound typically presents as a white to off-white crystalline powder. Its pKa values reflect those of secondary aliphatic amines, making it a moderately strong base once liberated from its salt form.

The compound is stable under ambient conditions when stored in a sealed container away from moisture, strong oxidizers, and direct light. Aqueous solutions should be handled promptly and stored at low temperature if prolonged storage is required.

Research Applications and Synthetic Utility

4,4′-Bipiperidyl dihydrochloride serves as a versatile building block in synthetic organic and medicinal chemistry. Its primary value lies in the bifunctional amine scaffold, which can be selectively alkylated, acylated, or sulfonylated at one or both nitrogen centers to produce a wide range of pharmacologically relevant structures.

Key application areas include:

• Medicinal chemistry: The bipiperidine core is found in several bioactive compounds and drug candidates. It serves as a rigid, conformationally restricted diamino spacer that can mimic natural polyamine frameworks or serve as a pharmacophore in its own right.
• Coordination chemistry and ligand design: The two nitrogen donors make 4,4′-bipiperidine an attractive chelating or bridging ligand for transition-metal complexes. Such complexes are relevant in catalysis and materials science.
• Polymer and materials chemistry: As a diamine monomer, 4,4′-bipiperidyl dihydrochloride can participate in step-growth polymerization reactions (e.g., polyurea, polyamide synthesis) to introduce flexible aliphatic segments with built-in basicity.
• Biological probe synthesis: The scaffold can be elaborated into ion-channel modulators, enzyme inhibitors, or receptor ligands for neuropharmacological studies.

Researchers should neutralize the dihydrochloride salt with base (e.g., NaOH or K₂CO₃) to liberate the free base prior to reactions requiring the unprotonated amine.

Handling, Safety, and Storage Guidelines

Although 4,4′-bipiperidyl dihydrochloride is not classified as acutely highly toxic, it should be handled with standard laboratory precautions appropriate for fine organic salts:

• Personal Protective Equipment (PPE): Wear appropriate lab coat, chemical-resistant gloves, and safety eyewear. Use respiratory protection (dust mask or respirator) when handling the powder to avoid inhalation of fine particles.
• Ventilation: Handle in a well-ventilated laboratory or chemical fume hood to minimize dust and aerosol exposure.
• Skin and eye contact: The hydrochloride salt is mildly acidic and may cause irritation. In case of contact, flush affected area immediately with copious water and seek medical attention if irritation persists.
• Storage: Store at room temperature (15–25 °C) in a tightly sealed container. Keep away from moisture, strong oxidizing agents, strong bases, and direct light. Ensure containers are clearly labeled.
• Disposal: Dispose of waste in accordance with local, regional, and national regulations for organic amine salts. Do not pour concentrated solutions down the drain without appropriate neutralization and dilution.

Always consult the Safety Data Sheet (SDS) provided by Aladdin Scientific for the most current and complete hazard information before use.

Preparation and Solution-Making Protocols

The following protocols provide general guidance for working with 4,4′-bipiperidyl dihydrochloride in common laboratory scenarios. Verify suitability for your specific application before use.

Aqueous Stock Solution Preparation

1. Determine the required concentration and volume of your stock solution.
2. Weigh the appropriate mass of 4,4′-bipiperidyl dihydrochloride using an analytical balance under ambient conditions. The compound is hygroscopic; minimize exposure time to humid air.
3. Transfer to a clean volumetric flask. Add approximately 80% of the final volume of ultrapure water (18.2 MΩ·cm) and stir or sonicate gently until fully dissolved.
4. Adjust to final volume with ultrapure water. Mix thoroughly.
5. Filter through a 0.22 µm membrane filter if a sterile or particle-free solution is required.
6. Label with compound name, concentration, date, and preparer's initials. Store at 2–8 °C if not used immediately.

Liberation of Free Base

1. Dissolve the dihydrochloride in water at the desired concentration.
2. Carefully add an equimolar or slight excess of NaOH or K₂CO₃ solution (2 equivalents per mole of dihydrochloride) with stirring.
3. Confirm pH adjustment (pH > 10) using a calibrated pH meter or indicator.
4. If an anhydrous free base is needed, extract with an organic solvent (e.g., DCM or EtOAc), dry over anhydrous MgSO₄ or Na₂SO₄, filter, and evaporate under reduced pressure.

Note: Exact solubility values and stock concentrations should be validated experimentally in your laboratory. Review flags have been set for specific numeric claims.

Quality, Purity, and Specification Considerations

When selecting 4,4′-bipiperidyl dihydrochloride for research applications, purity grade is a critical parameter. Aladdin Scientific offers B301400 for research use. The following considerations apply when evaluating specifications:

• Purity assessment: High-purity material (typically ≥97% or ≥98% by HPLC or titration) is preferred for synthetic applications where impurities could compromise reaction selectivity, yield, or downstream biological assay results. Check the Certificate of Analysis (CoA) for each lot.
• Identity confirmation: Confirm compound identity via ¹H NMR, ¹³C NMR, or mass spectrometry. Key NMR features include characteristic multiplets for piperidine ring protons. IR spectroscopy can confirm the N–H stretch of the ammonium salt.
• Water content: Because the dihydrochloride is hygroscopic, Karl Fischer titration is recommended to determine water content when precise stoichiometry is critical.
• Lot-to-lot consistency: Request a CoA for each new lot. Compare melting point, HPLC purity, and any spectroscopic data against your in-house reference standards.
• Packaging and quantity: Contact Aladdin Scientific procurement for available packaging sizes and bulk quantity pricing to suit your project scale.

If you require additional analytical documentation (e.g., GC purity, residual solvent profiles, heavy-metal content), please contact Aladdin Scientific technical support.

Frequently asked questions

What is 4,4′-bipiperidyl dihydrochloride used for in research?

4,4′-Bipiperidyl dihydrochloride is primarily used as a synthetic building block and ligand precursor in organic, medicinal, and coordination chemistry. Its bifunctional secondary amine scaffold enables selective functionalization at one or both nitrogen centers, making it valuable for drug discovery, polyamine analogue synthesis, transition-metal ligand design, and step-growth polymerization.

How do I convert 4,4′-bipiperidyl dihydrochloride to the free base?

Dissolve the dihydrochloride salt in water and treat with 2 equivalents of a strong base such as NaOH or K2CO3 per mole of salt, adjusting pH to above 10. If a dry, anhydrous free base is required, extract the aqueous mixture with a water-immiscible organic solvent such as dichloromethane or ethyl acetate, dry over anhydrous magnesium or sodium sulfate, filter, and concentrate under reduced pressure.

What purity grade of 4,4′-bipiperidyl dihydrochloride (B301400) is available from Aladdin Scientific?

Aladdin Scientific offers 4,4′-bipiperidyl dihydrochloride under SKU B301400 for research use. For the exact purity specification and lot-specific Certificate of Analysis, please visit the product page on the Aladdin Scientific website or contact our technical support team directly.

How should 4,4′-bipiperidyl dihydrochloride be stored to maintain stability?

Store 4,4′-bipiperidyl dihydrochloride at room temperature (15–25 °C) in a tightly sealed container, away from moisture, strong oxidizing agents, strong bases, and direct light. Because the compound is hygroscopic, minimize its exposure to humid air during weighing. Aqueous solutions should be stored at 2–8 °C and used promptly.

Is 4,4′-bipiperidyl dihydrochloride soluble in common laboratory solvents?

4,4′-Bipiperidyl dihydrochloride is freely soluble in water due to its ionic salt form. Solubility in ethanol is limited, and it has very low solubility in nonpolar organic solvents such as diethyl ether, hexane, or chloroform. For non-aqueous reactions requiring the free base, liberation with base followed by organic solvent extraction is recommended.

References

1. March, J. Advanced Organic Chemistry: Reactions, Mechanisms, and Structure. 4th ed. Wiley-Interscience, 1992. (General reference for amine chemistry and salt formation.)
2. Clayden, J.; Greeves, N.; Warren, S. Organic Chemistry. 2nd ed. Oxford University Press, 2012. (Reference for piperidine ring chemistry and amine functionalization protocols.)
3. Aladdin Scientific. Product Page: 4,4′-Bipiperidyl dihydrochloride, SKU B301400. (Accessed via Aladdin Scientific website; consult for current CoA and SDS.)

Products are supplied for research and development use only. Not for use in humans, animals, diagnosis, or therapy.