Chemical Structure and Physicochemical Properties

1-Phenyl-1,2,3,4-tetrahydroisoquinoline (1-phenyl-THIQ) belongs to the tetrahydroisoquinoline family of bicyclic amines. Its structure consists of a benzene ring fused to a partially saturated six-membered ring containing a secondary amine, with a phenyl substituent at the C-1 position. This substitution pattern introduces a stereogenic center at C-1, making the compound relevant to asymmetric synthesis and chiral resolution studies.

Key physicochemical characteristics include a molecular formula of C₁₅H₁₅N and a molecular weight of approximately 209.29 g/mol. The secondary amine (pKa typically in the range of 8–10 for tetrahydroisoquinolines) confers basicity, allowing salt formation with common acids such as HCl. The compound is typically obtained as a pale yellow to off-white solid or oil depending on purity and storage conditions. It is sparingly soluble in water but dissolves readily in common organic solvents including dichloromethane, ethanol, methanol, and ethyl acetate.

Note: Specific melting point, optical rotation, and spectroscopic data should be confirmed against the certificate of analysis (CoA) provided with each lot of Aladdin product P160805.

Synthesis Relevance and Applications in Medicinal Chemistry

The 1,2,3,4-tetrahydroisoquinoline (THIQ) scaffold is found in numerous biologically active natural products and pharmaceuticals, including morphine-related alkaloids, noscapine, and various dopaminergic compounds. The introduction of a phenyl group at the C-1 position of THIQ generates a structural motif closely related to the benzylisoquinoline alkaloid family, underpinning its utility in total synthesis and drug discovery programs.

1-Phenyl-THIQ is widely employed as:

• Chiral building block: Enantiopure forms can be accessed via asymmetric Pictet–Spengler reactions, enzymatic resolution, or chiral HPLC separation, providing enantiomerically enriched intermediates for target-oriented synthesis.
• Pharmacophore model: The compound serves as a reference scaffold for structure–activity relationship (SAR) studies targeting receptors such as dopamine, serotonin, and sigma receptors.
• Synthetic intermediate: It can undergo N-acylation, N-alkylation, oxidation to the corresponding isoquinoline, and ring-opening reactions, enabling diversification of compound libraries.
• Monoamine oxidase (MAO) research: Certain THIQ derivatives and related structures have been investigated for their interactions with MAO enzymes, relevant to Parkinson's disease research.

Review flag: Specific receptor binding data and IC₅₀ values for 1-phenyl-THIQ itself are not provided in source material; researchers should consult primary literature before drawing pharmacological conclusions.

Laboratory Handling and Storage Guidelines

Proper handling of 1-Phenyl-1,2,3,4-tetrahydroisoquinoline is essential to maintain reagent integrity and ensure researcher safety. The following guidelines represent standard laboratory best practices for secondary amine heterocycles:

Personal Protective Equipment (PPE)

• Wear appropriate chemical-resistant gloves (nitrile recommended) when handling the compound.
• Use safety glasses or goggles and a laboratory coat at all times.
• Handle in a well-ventilated fume hood to avoid inhalation of dust or vapors.

Storage Conditions

• Store in a tightly sealed container away from moisture, light, and heat.
• Recommended storage temperature: 2–8 °C or as specified on the product label and CoA for P160805.
• Keep away from strong oxidizing agents, strong acids, and reactive halogenating agents.

Stability Considerations

• Secondary amines such as 1-phenyl-THIQ may be susceptible to oxidation upon prolonged exposure to air; minimize unnecessary exposure.
• Allow cold-stored material to equilibrate to room temperature before opening to prevent moisture condensation.

Review flag: Specific GHS hazard classification, H-statements and P-statements for this compound should be verified from the current Aladdin SDS for P160805 before use.

Quality, Purity and Analytical Verification

For research applications, reagent purity is critical to reproducible results. When sourcing 1-Phenyl-1,2,3,4-tetrahydroisoquinoline (Aladdin SKU P160805), researchers should verify the following quality parameters from the certificate of analysis (CoA):

• Purity: Confirm purity by HPLC or GC as stated on the CoA. For synthetic applications, ≥97% purity is generally recommended.
• Identity confirmation: Verify by ¹H NMR, ¹³C NMR, and/or mass spectrometry (MS) to confirm the expected molecular ion [M+H]⁺ at m/z 210.1 (approximate) and characteristic aromatic and aliphatic proton signals.
• Enantiomeric purity: If enantioselective work is planned, assess enantiomeric excess (ee) by chiral HPLC or optical rotation measurement, as the racemic compound is the standard commercial form.
• Appearance: Compare observed appearance with the CoA specification; any deviation may indicate degradation.

Aladdin Scientific provides a lot-specific CoA for P160805 upon request or via the product page. Contact technical support if analytical data are required for regulatory submissions or publication.

Regulatory Considerations and Procurement

1-Phenyl-1,2,3,4-tetrahydroisoquinoline is supplied by Aladdin Scientific as a research-grade reagent intended for laboratory use only. The following points should be considered during procurement and use:

• Research use only: This compound is not approved for human or veterinary therapeutic use. It must not be used in clinical, food, or cosmetic applications.
• Controlled substance status: While 1-phenyl-THIQ itself is not universally scheduled as a controlled substance, researchers should verify its regulatory status under applicable national and local regulations before ordering, particularly given structural similarities to pharmacologically active THIQ alkaloids.
• Export/import compliance: International shipment may be subject to export control regulations. Confirm compliance with your institution's chemical management office.
• Waste disposal: Dispose of waste material in accordance with local environmental regulations for organic nitrogen-containing compounds.

To order P160805, visit the Aladdin Scientific product page or contact your local Aladdin representative. Bulk quantities and custom packaging may be available upon request.