Chemical Identity and Properties

Carbamic acid, N-[trans-4-(aminomethyl)cyclohexyl]-, 1,1-dimethylethyl ester 1/2 oxalic acid (Aladdin SKU: C175200) is an oxalate salt of the mono-Boc-protected diamine derived from trans-1,4-diaminomethylcyclohexane. The molecule presents two distinct nitrogen-containing functional groups: one primary amine (–CH₂NH₂) and one secondary amine bearing the tert-butoxycarbonyl (Boc) protecting group. The oxalate counterion improves crystallinity, stability, and handling compared with the free base, making it the preferred commercial form for storage and shipping.

The trans configuration of the cyclohexane ring confers a rigid, well-defined spatial relationship between the two amine groups, which is an important geometric feature exploited in structure–activity relationship (SAR) studies. The Boc carbamate is stable under basic and neutral conditions but is cleanly removed under mild acidic conditions — typically trifluoroacetic acid (TFA) in dichloromethane or 4 M HCl in 1,4-dioxane — to regenerate the free diamine selectively without affecting most other functional groups present in a complex molecule.

Laboratory Handling and Safety Precautions

As with all laboratory chemical reagents, appropriate personal protective equipment (PPE) must be worn when handling C175200. This includes chemical-resistant gloves, a laboratory coat, and safety glasses or goggles. Operations that may generate dust or aerosols should be conducted in a chemical fume hood to prevent inhalation exposure.

Skin and eye contact: In the event of skin contact, wash the affected area immediately with large amounts of water for at least 15 minutes and remove contaminated clothing. For eye contact, irrigate immediately with copious water and seek medical attention. The oxalic acid component is a mild irritant and a dicarboxylic acid; avoid ingestion.

Incompatibilities: Keep away from strong oxidizing agents, strong acids beyond the quantities used for Boc deprotection, and strong bases that may degrade the carbamate linkage. Avoid prolonged exposure to moisture, which can promote hydrolysis and reduce reagent quality.

Waste disposal: Dispose of all waste materials in accordance with applicable local and national regulations. Do not dispose of down the drain without prior treatment and approval by your institution's environmental health and safety (EHS) office.

Storage and Stability Recommendations

C175200 should be stored in a tightly sealed container in a cool (ideally 2–8 °C or per label specification), dry, and well-ventilated location. Protect from light and moisture. The oxalate salt form generally provides superior solid-state stability relative to the free-base diamine, but proper storage conditions remain essential to preserve reagent integrity over time.

Upon receipt, inspect the material for any visible signs of degradation such as discoloration or clumping due to moisture uptake. Record the lot number, receipt date, and storage location in your laboratory inventory system. When weighing portions of the compound, minimize exposure time outside the storage container, reseal promptly, and return to proper storage immediately.

If solutions are prepared, use freshly dried solvents where practical. Solutions of Boc-protected amines are generally stable for short periods but should be prepared fresh for critical reactions. Consult the Certificate of Analysis (CoA) provided with each lot for confirmed purity data and recommended shelf-life information.

Typical Synthetic Applications and Deprotection Protocol

C175200 serves as a versatile building block in synthetic organic and medicinal chemistry. The free primary amine (–CH₂NH₂) is available for selective functionalization — including acylation, reductive amination, sulfonylation, or coupling reactions — while the Boc group temporarily masks the ring nitrogen. This orthogonal protection strategy allows stepwise introduction of different substituents on the two amine groups.

Standard Boc Deprotection (TFA method):

1. Dissolve the Boc-protected substrate in anhydrous dichloromethane (DCM) at a concentration of approximately 0.1–0.5 M.
2. Add 20–50% (v/v) trifluoroacetic acid (TFA) at 0 °C, then allow to warm to room temperature.
3. Stir for 1–4 hours, monitoring by TLC or LC-MS until complete consumption of starting material is observed.
4. Concentrate under reduced pressure, then co-evaporate with toluene or DCM to remove residual TFA.
5. The resulting TFA salt of the free amine can be neutralized with a suitable base (e.g., triethylamine, Hünig's base) or converted to a desired salt form.

Alternative HCl method: Treatment with 4 M HCl in 1,4-dioxane (4 equiv., RT, 1–2 h) provides the hydrochloride salt of the deprotected amine directly, which is often crystalline and easy to isolate by filtration or precipitation.

When working up reactions involving the oxalate salt form as starting material, note that an equivalent of oxalic acid will be present in solution; account for this when calculating stoichiometries and when performing aqueous washes.

Quality Control and Documentation Best Practices

Upon receipt of C175200 from Aladdin Scientific, researchers should verify product identity and purity by reviewing the Certificate of Analysis (CoA) included with the shipment. Key analytical data to check typically include: HPLC purity (%), ¹H NMR spectrum confirmation of structure, and appearance (physical form, color). If additional independent verification is required, techniques such as ¹³C NMR, high-resolution mass spectrometry (HRMS), and Karl Fischer titration (for water content) are recommended.

Maintain complete laboratory records documenting: lot number, supplier, date of receipt, storage conditions, date of first opening, and all experiments in which the reagent was used. This traceability is critical for troubleshooting synthetic results and for compliance with good laboratory practice (GLP) standards where applicable.

For regulated research environments, retain the CoA and Safety Data Sheet (SDS) in accessible laboratory files. The SDS provides authoritative information on hazard classification, first-aid measures, fire-fighting procedures, and regulatory status. If you require specific regulatory or compliance documentation not included with your shipment, contact Aladdin Scientific customer support.