3-Bromo-4-chlorophenol

This compound is typically obtained as a crystalline solid ranging from off-white to light tan. Its molecular formula is C6H4BrClO, corresponding to a molecular weight of 207.45. The melting point generally falls within the range of 62–66 ℃. The calculated density is approximately 1.86 g/cm³ under ambient conditions. It exhibits good solubility in common organic solvents including methanol, ethanol, acetone, and ethyl acetate, while showing limited solubility in water and moderate solubility in nonpolar solvents such as dichloromethane and toluene. The molecule consists of a phenol ring with a bromine atom at the 3position and a chlorine atom at the 4position. The phenolic hydroxyl is acidic and can participate in hydrogen bonding, while both halogen atoms are activated toward nucleophilic aromatic substitution and transitionmetalcatalyzed crosscoupling reactions. Storage in tightly sealed containers protected from light and moisture at ambient temperature is generally adequate, though desiccated conditions are recommended for prolonged periods. Contact with strong oxidizing agents, strong bases, and acid chlorides should be avoided.

3Bromo4chlorophenol is a disubstituted phenol derivative featuring both bromine and chlorine atoms on the aromatic ring in a 1,2relationship relative to each other, with the hydroxyl group at the 1position. The phenol core provides an acidic proton capable of hydrogen bonding and metal coordination, while the electronwithdrawing halogens modulate the acidity of the hydroxyl group and influence the overall electronic distribution. The bromine atom at the 3position and chlorine at the 4position offer orthogonal handles for sequential functionalization through palladiumcatalyzed crosscoupling reactions, with the bromine generally being more reactive due to the weaker carbonhalogen bond. This substitution pattern creates a polarized aromatic system where the halogens can direct electrophilic substitution and activate specific positions toward nucleophilic attack. The combination of a modifiable phenol and two different halogen handles on a compact aromatic scaffold makes the compound a valuable building block in medicinal chemistry, agrochemical research, and materials science for constructing more complex molecules with tailored electronic and steric properties.

This halogenated phenol is employed in the synthesis of various therapeutic agents, including antimicrobial compounds and enzyme inhibitors. The phenolic hydroxyl enables convenient ether formation with alkyl halides or esterification with carboxylic acids, while the bromine and chlorine atoms allow for sequential crosscoupling reactions to introduce diverse aryl, heteroaryl, or amino groups. The electronwithdrawing halogens can modulate the acidity and hydrogenbonding capacity of the phenol, influencing binding interactions with biological targets.

In crop protection chemistry, this compound serves as a precursor for developing novel fungicides and herbicides. Halogenated phenols are common motifs in agrochemicals that disrupt fungal membrane integrity or inhibit key enzymes in plant metabolic pathways. The bromine and chlorine atoms enable finetuning of lipophilicity and electronic properties to optimize target affinity and environmental persistence, while the phenol provides a handle for further derivatization through ester or ether formation.

The rigid aromatic core and orthogonal halogen handles make this compound valuable for designing liquid crystalline compounds and organic semiconductors. Incorporation into conjugated polymers through crosscoupling polymerization yields materials with tunable optoelectronic properties for applications in organic fieldeffect transistors and photovoltaic devices. The phenol group can be used to introduce solubilizing chains or to anchor the materials to surfaces.

As a versatile synthetic intermediate, 3bromo4chlorophenol participates in diverse transformations including Ullmann couplings, SuzukiMiyaura reactions, and nucleophilic aromatic substitution. The differential reactivity of the two halogens enables sequential functionalization: the bromine can be engaged in crosscoupling while the chlorine remains intact for later elaboration. The phenol can be protected as an ether or ester to modulate reactivity during synthetic sequences. Its utility extends to the synthesis of natural product analogs and functional materials where precise control over substitution patterns on the aromatic ring is required.

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