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Strategic chemical procurement demands more than competitive pricing; it requires verifiable manufacturing origins, consistent stereochemical purity, and ironclad regulatory compliance.
The global fine chemical marketplace frequently suffers from secondary and tertiary brokers repackaging uncertified material. True manufacturers maintain synthesis control directly within GLP-aligned multi-purpose reactor suites.
By producing directly from calibrated precursors—namely 4-aminobenzoic acid derivatives and diethylamino-substituted alcohols—producers ensure unadulterated crystal habit and eliminate cross-contamination risks.
Every commercial batch must be underpinned by a comprehensive dossier comprising high-performance liquid chromatography (HPLC), proton and carbon-13 nuclear magnetic resonance (1H/13C-NMR), and gas chromatography-mass spectrometry (GC-MS).
Without baseline integration data and explicit impurity profiling, downstream research laboratories risk corrupted analytical baselines and wasted institutional grant budgets.
Dimethocaine (hydrochloride or free base) exhibits hygroscopic vulnerabilities under specific atmospheric relative humidity conditions. Uncontrolled oceanic or air transit degrades crystalline integrity.
Enterprise chemical suppliers implement multi-layer moisture-barrier foil hermetic sealing, desiccated nitrogen headspace purging, and temperature-stabilized tracking from synthesis reactor to laboratory receiving dock.
Institutional researchers and contract testing organizations (CROs) should mandate that vendors provide raw HPLC chromatograms demonstrating baseline separation of the 4-aminobenzoate core from mono-dealkylated and ester-cleaved degradants, rather than accepting unverified tabular claims of 99% nominal assay.
Technical reference parameters comparing the free base and the standard monohydrochloride salt format utilized across analytical, forensic, and pharmacological research applications.
| Analytical Parameter | Dimethocaine Monohydrochloride (DMC HCl) | Dimethocaine Free Base | Validation Methodology |
|---|---|---|---|
| IUPAC Systematic Name | (3-diethylamino-2,2-dimethylpropyl) 4-aminobenzoate monohydrochloride | (3-diethylamino-2,2-dimethylpropyl) 4-aminobenzoate | IUPAC Standard Nomenclature |
| CAS Registry Number | 533-85-2 | 553-63-9 | Chemical Abstracts Service |
| Molecular Formula | C16H26N2O2 · HCl | C16H26N2O2 | High-Res Mass Spectrometry (HRMS) |
| Molecular Weight | 314.85 g/mol | 278.39 g/mol | Theoretical Molecular Mass |
| Physical Appearance | White crystalline micro-powder | Off-white to pale yellow viscous oil / low-melting solid | Visual / Optical Microscopy |
| Chromatographic Purity | ≥99.2% (a/a) | ≥98.5% (a/a) | HPLC-DAD (Reverse Phase, C18) |
| Melting Point Range | 176.0 °C – 179.0 °C | 40.0 °C – 43.0 °C | Differential Scanning Calorimetry (DSC) |
| Solubility Profile | Freely soluble in H2O, methanol; slightly in EtOH | Soluble in ethyl acetate, chloroform, ether; insoluble in H2O | Gravimetric / Visual Titration |
| Residual Solvents | Ethanol <500 ppm, Isopropanol <500 ppm | Ethyl Acetate <500 ppm, n-Hexane <290 ppm | GC-HS (ICH Q3C Guideline) |
| Heavy Metals Content | ≤10 ppm total heavy metals | ≤10 ppm total heavy metals | ICP-MS Inductively Coupled Plasma |
Store sealed containers at -20°C for prolonged reference preservation. The hydrochloride salt demonstrates robust thermal stability up to 24 months when protected from light, ambient moisture, and atmospheric carbon dioxide.
Because DMC incorporates a benzoate ester linkage, exposure to aqueous alkaline solutions will induce hydrolytic cleavage into 4-aminobenzoic acid (PABA) and 3-diethylamino-2,2-dimethylpropanol. Maintain neutral pH during reagent preparation.
All batches manufactured and distributed are strictly intended for scientific laboratory research, structural characterization, in vitro assay calibration, and legal chemical synthesis. Human consumption is strictly prohibited.
An exhaustive analysis of regulatory classifications, legal import prerequisites, and supply-chain auditing frameworks across principal geopolitical jurisdictions.
In the United States, Dimethocaine is not specifically scheduled under the Federal Controlled Substances Act (CSA). However, procurement departments must assess potential scrutiny under the Federal Analogue Act if imported for non-research uses.
Canada evaluates the compound under schedule boundaries of the CDSA; legitimate laboratories must execute an End-User Declaration (EUD) stating in vitro analytical intentions.
Regulatory status varies dynamically across EU member states. In the United Kingdom, Dimethocaine falls within the scope of the Psychoactive Substances Act 2016 for consumer retail, but legitimate commercial research supply remains permissible under licensed institutional oversight.
Suppliers must supply REACH-compliant Safety Data Sheets (SDS) and clear ECHA classification dossiers.
As the primary manufacturing territory for fine chemical synthesis, China strictly controls standard precursor reagents. Approved facilities operate under clean production permits and formal volatile organic compound (VOC) emissions caps.
Japanese import controls require confirmation that materials are not marketed as unapproved medical formulations under the PMDA charter.
Enterprise chemical trade demands comprehensive cross-border compliance packages. Shipments are accompanied by HS Code tariff declarations (typically falling under 2922.49 or 2922.50), verified Commercial Invoices, GHS-aligned labeling, and Packing Slips.
This multi-tiered documentation pre-empts custom delays at air cargo ports worldwide.
Dimethocaine (Larocaine) functions as a foundational chemical benchmark across multiple pharmacological, forensic, and chemical engineering disciplines.
Forensic laboratories and state toxicological agencies employ high-purity DMC monohydrochloride as a reference calibration standard. High-performance liquid chromatography tandem mass spectrometry (LC-MS/MS) and GC-MS spectral databases (NIST, SWGDRUG) rely on verified primary standards to identify unknown samples seized at border crossings.
Accurate retention time indexes and fragmentation patterns (notably the diagnostic m/z 86 fragment ion corresponding to the diethylaminoethyl moiety) require uncompromised, reference-grade purity.
In academic pharmacology, Dimethocaine is extensively studied as an atypical monoamine reuptake inhibitor. Structural biologists leverage the compound to map the spatial architecture of the human dopamine transporter (hDAT) and serotonin transporter (hSERT) binding pockets.
Because DMC exhibits dopamine transporter inhibition without the tropane bridge typical of cocaine, comparative affinity assays (Ki values) elucidate how ester conformations influence uptake kinetics versus channel blockade.
Historically developed by Hoffman-La Roche as an analog of procaine, Larocaine retains significant local anesthetic potency. Neurobiologists utilize the molecule in patch-clamp electrophysiology to evaluate blockades across voltage-gated sodium channels (Nav1.1 through Nav1.7).
Its distinct quaternary carbon center adjacent to the ester oxygen modifies the pKa and lipophilicity, making it a critical research tool for delineating tonic versus frequency-dependent neural conduction blockades.
How pioneering chemical manufacturers are transitioning from traditional batch vessels to automated microreactor platforms to elevate yield, eliminate hazardous intermediates, and tighten polymorphic consistency.
Traditional batch synthesis of Dimethocaine involves reacting 4-nitrobenzoyl chloride with 3-diethylamino-2,2-dimethylpropan-1-ol, yielding an intermediate that undergoes subsequent nitro-reduction. Continuous flow microreactors maintain precise stoichiometric equilibrium, reducing exothermic runaway hazards.
Replacing toxic tin/acid or sulfide reductants with continuous-flow heterogeneous catalytic hydrogenation (using Pd/C or Raney nickel packed beds under pressurized H2) ensures complete conversion of the 4-nitro aromatic precursor to the aniline functionality without generating toxic heavy metal effluent.
Controlled antisolvent addition coupled with in-line Focused Beam Reflectance Measurement (FBRM) tracks nucleation events in real time. This ensures consistent crystal size distribution (CSD), preventing the formation of micro-amorphous powders that degrade during shelf storage.
Process Analytical Technology (PAT) incorporating inline near-infrared (NIR) and Raman spectroscopy continuously probes residual solvent levels and salt formation. This replaces slow post-hoc batch release testing with instantaneous quality assurance verification.
Before issuing a commercial purchase order for Dimethocaine, institutional procurement officers should vet suppliers against the following empirical benchmarks.
Insist on receiving primary FID and UV traces for HPLC and 500 MHz 1H-NMR spectra featuring solvent peaks (CDCl3 or DMSO-d6) and clear peak integrations that confirm the ethyl and gem-dimethyl singlets.
Verify whether the vendor is quoting the crystalline monohydrochloride (CAS 533-85-2) or the free base oil/semisolid (CAS 553-63-9). Price discrepancies frequently trace back to lower-stability free base offerings.
Residual moisture promotes ester hydrolysis over time. Reliable manufacturers execute Karl Fischer titration or thermogravimetric analysis to guarantee that water content remains strictly beneath the 0.5% ceiling.
Examine whether the manufacturer provides compliant Safety Data Sheets (16 sections according to UN GHS Revision 9), formal commercial invoices detailing exact CAS registrations, and declaration certificates.
Confirm whether the supplier maintains single-batch pilot capacities (from 500g pilot batches up to 50kg production campaigns), preventing lot-to-lot baseline variability during continuous research studies.
Validate that packaging uses double-walled antistatic poly bags contained within heat-sealed aluminum foil sleeves with molecular sieve desiccants to preserve the crystal habit during intercontinental shipping.
In-depth responses to critical questions posed by quality assurance managers, analytical chemists, and enterprise supply chain directors.
While both compounds share a 4-aminobenzoate core and a diethylaminoalkyl sidechain, Dimethocaine features a neopentyl-like branch: it incorporates two geminal methyl groups at the C-2 position of the propyl chain (2,2-dimethylpropyl). This steric hindrance around the beta position significantly slows down in vivo esterase cleavage compared to procaine and increases overall molecular lipophilicity, altering its interaction with both sodium ion channels and monoamine transporters.
It is critical to specify the exact chemical salt form. Dimethocaine Monohydrochloride corresponds to CAS No. 533-85-2, which is the solid crystalline powder standard across research and analytical labs. The free base corresponds to CAS No. 553-63-9, which exists as a low-melting solid or viscous oil. Discrepancies between the CAS number on the commercial invoice and customs databases can lead to automated customs holds.
The principal degradant is 4-aminobenzoic acid (PABA), resulting from hydrolytic cleavage of the ester bond under humid or elevated temperature conditions. A secondary possible impurity from synthesis is residual 4-nitrobenzoate ester intermediates or the mono-ethyl dealkylated derivative ((3-(ethylamino)-2,2-dimethylpropyl) 4-aminobenzoate). A calibrated reverse-phase C18 HPLC column using an acetonitrile/water gradient with 0.1% trifluoroacetic acid (TFA) readily resolves these impurities from the DMC analyte peak.
In most jurisdictions globally, Dimethocaine is not specifically listed as a Schedule I controlled substance, making it legally acquirable by verified academic institutions, analytical laboratories, and research organizations under bona fide non-clinical research exemptions. However, certain jurisdictions (e.g., the UK under psychoactive substance statutes, or specific US state-level analogs) enforce restrictions on unapproved distribution. Verified suppliers require signed end-user declarations (EUD) before shipping.
DMC HCl is freely water-soluble at concentrations up to 50 mg/mL, forming a clear, colorless aqueous solution. It also exhibits high solubility in analytical-grade methanol and DMSO. Solutions prepared in physiological buffers (e.g., PBS at pH 7.4) should be prepared fresh on the day of experimentation or stored flash-frozen at -80°C to eliminate baseline ester hydrolysis.
For institutional bulk orders (1 kg to 25 kg), material is sealed within double-layered USP Class VI virgin polyethylene inner liner bags, evacuated with dry inert nitrogen, and placed into a light-impermeable, hermetically heat-sealed heavy-gauge aluminum composite foil barrier bag. The outer pack is secured within an UN-rated fiber drum with tamper-evident security seals.
Browse our continuous production series of lyophilized signaling compounds, high-titer biochemical markers, and reference powders manufactured to rigorous analytical standards.
Engage with our chemical engineering and compliance desks to request batch certificates, lot-specific HPLC/1H-NMR spectra, and customized quotation schedules for commercial synthesis lots.
Provide target CAS, desired quantity, and destination jurisdiction to immediately receive the corresponding lot-specific Certificate of Analysis and analytical HPLC trace.
Submit your institutional End-User Declaration (EUD) and organizational credentials to qualify for rapid regulatory dispatch clearance through authorized carrier channels.
Commercial orders are dispatched within inert gas hermetic containment and supported by end-to-end tracking, customs brokerage pre-clearance, and rapid air express logistics.
