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The compound is 2-(3-Bromo-4,5-dimethoxyphenyl)ethan-1-amine hydrochloride, a substituted phenethylamine derivative characterized by the presence of a bromine atom at the meta position relative to the ethylamine side chain, two methoxy groups at the 4- and 5-positions, and a primary amine group forming the hydrochloride salt. Structurally, the molecule comprises a 3,4,5-trisubstituted benzene ring bearing a two‑carbon ethylamine tether, creating an architecture that closely resembles the endogenous neurotransmitters dopamine and noradrenaline, yet with distinct substitutional differences. The bromine atom at the 3‑position introduces a heavy halogen with significant polarizability and electron‑withdrawing character, modulating the electronic environment of the aromatic ring and providing a versatile handle for further cross‑coupling functionalization. The 4,5‑dimethoxy substitution pattern, in contrast to the 3,4‑dihydroxy pattern found in dopamine, substantially enhances lipophilicity and metabolic stability while preserving the distance between the aromatic ring and the basic amine nitrogen. The hydrochloride salt form in 2-(3-Bromo-4,5-dimethoxyphenyl)ethan-1-amine hydrochloride protonates the primary amine to produce a water‑soluble, non‑hygroscopic crystalline solid, conferring advantages in handling, storage, and formulation over the free base. This precise combination — a phenethylamine backbone, a strategically placed bromine atom for synthetic diversification, a 4,5‑dimethoxylation pattern, and stable hydrochloride salt formation — underlies the compound‘s utility as a critical building block in modern pharmaceutical synthesis and medicinal chemistry.

The molecular architecture of 1-Bromo-4-(t-butyldimethylsilyloxy)butane (C₁₀H₂₃BrOSi, MW 267.28) features a linear four-carbon alkyl chain bearing two strategically differentiated terminal functional groups: a primary alkyl bromide and a tert-butyldimethylsilyl (TBS) protected alcohol. This bifunctional arrangement places an electrophilic carbon (C-Br) at one terminus, primed for nucleophilic displacement or metal-halogen exchange, while the bulky, lipophilic TBS group at the opposing end shields the masked hydroxyl from premature reaction. The silicon-containing protecting group, with its characteristic tert-butyl and two methyl substituents, imparts significant hydrophobic character to the molecule—reflected in a predicted density of approximately 1.073 g/cm³—and contributes to its existence as a colorless to pale yellow liquid with a boiling point of approximately 250°C. The molecule possesses one hydrogen bond acceptor (the silyl ether oxygen) and seven freely rotatable bonds, conferring substantial conformational flexibility to the four-carbon tether. This combination of a reactive alkyl bromide with an orthogonal TBS-protected alcohol makes 1-Bromo-4-(t-butyldimethylsilyloxy)butane a versatile and widely employed chemical building block in multi-step organic synthesis.

The molecular architecture of 4-((tert-Butyldimethylsilyl)oxy)butanal (C₁₀H₂₂O₂Si, MW 202.37) is constructed around a four-carbon linear butanal backbone, where the terminal hydroxyl group has been chemoselectively protected with a tert-butyldimethylsilyl (TBS) ether. This introduces a bulky, lipophilic silicon-containing cage that shields the oxygen atom from unwanted nucleophilic or protic interactions, while the distal aldehyde remains exposed as the primary reactive handle. The TBS group imparts significant hydrophobic character—reflected in a predicted LogP of approximately 3.0—and dominates the molecule‘s physical behavior, contributing to its existence as a colorless to pale yellow liquid with a predicted density of 0.868 g/cm³ and a boiling point of approximately 225°C. The molecule features zero hydrogen bond donors, two hydrogen bond acceptors (the silyl ether oxygen and the aldehyde carbonyl), and six freely rotatable bonds, conferring substantial conformational flexibility to the protected chain. This bifunctional architecture—combining a robust, sterically demanding silyl protecting group with a reactive terminal aldehyde—makes 4-((tert-Butyldimethylsilyl)oxy)butanal a versatile chemical building block in multi-step organic synthesis.

The molecular architecture of Cholest-5-en-3-ol (3β)-, 3-(6-bromohexanoate) (C₃₃H₅₅BrO₂, MW 563.69) is constructed by the esterification of cholesterol at the C3β-hydroxyl position with 6-bromohexanoic acid, yielding a cholesteryl ester bearing a six-carbon ω-bromoalkanoyl chain linked via an ester carbonyl to the steroid A-ring. The cholesterol scaffold—a tetracyclic framework consisting of three fused cyclohexane rings (A, B, C) and one cyclopentane ring (D)—imparts exceptional structural rigidity, with the C5–C6 double bond in ring B contributing to the planarity and conformational pre-organization of the steroid nucleus. The 3β-ester linkage orients the 6-bromohexanoyl chain in an equatorial disposition relative to ring A, extending the flexible six-carbon tether terminated by a primary alkyl bromide into space. This ω-bromo substituent constitutes a reactive electrophilic center primed for nucleophilic displacement (SN2), Williamson ether synthesis, and amine alkylation, while the cholesteryl moiety contributes substantial lipophilicity (predicted LogP ~10–11), lyotropic liquid crystallinity, and a pronounced tendency toward self-assembly in both solution and bulk phases. The molecule exhibits a melting point of 119–120 °C—consistent with the crystalline character imparted by the rigid steroid core—and a predicted boiling point of approximately 579 °C at atmospheric pressure. This combination of a rigid, mesogenic cholesterol scaffold with a reactive terminal alkyl bromide tethered via a six-carbon ester linker makes Cholest-5-en-3-ol (3β)-, 3-(6-bromohexanoate) a versatile platform molecule for the construction of liquid crystalline materials, supramolecular architectures, and cholesterol-functionalized conjugates.

Tris[2-(MethylaMino)ethyl]aMine is a tripodal polyamine featuring a central tertiary amine core from which three identical 2-(methylamino)ethyl arms radiate outward. This structural arrangement creates a molecule with four nitrogen atoms: one central tertiary amine serving as a branching point and three secondary methylamine groups terminating each flexible ethyl spacer. The C₃-symmetric architecture gives it a pre-organized, claw-like geometry reminiscent of the well-known tris(2-aminoethyl)amine (tren) scaffold, but with N-methyl substituents on each arm. With a predicted pKa of approximately 10.56, the secondary amines exist largely in their protonated form under physiological conditions . This unique tripodal framework equips it with four Lewis base sites capable of forming multidentate coordination complexes, while the methyl substitution modulates steric bulk and electronic character compared to the parent tren system.

The molecular architecture of Benzyl 4-bromobutyl ether (C₁₁H₁₅BrO, MW 243.14) features a benzyl-protected four-carbon alkyl chain terminated by a primary alkyl bromide. The molecule is constructed around a flexible butoxy spacer, where the oxygen atom is connected to a benzyl group—a phenyl ring attached via a methylene (-CH₂-) bridge—at one terminus and a four-carbon chain ending in a bromine atom at the other. The benzyl ether moiety provides a robust protecting group for the alcohol functionality, offering stability under a range of reaction conditions while remaining susceptible to selective cleavage via hydrogenolysis (H₂, Pd/C) or Lewis acid-mediated debenzylation, thereby revealing the free hydroxyl group when desired. The primary alkyl bromide serves as a versatile electrophilic center, primed for nucleophilic substitution (SN2) reactions, metal-halogen exchange, and cross-coupling transformations. This combination of a stable benzyl-protected alcohol and a reactive alkyl bromide makes Benzyl 4-bromobutyl ether a bifunctional C4 building block with precisely differentiated, orthogonal reactive handles suitable for convergent synthetic strategies.