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4-Bromoanisole is an organic compound used widely across research, manufacturing, and laboratory applications. With a molecular formula of C7H7BrO and a molecular weight of about 187.04 g/mol, this chemical delivers a unique blend of properties. Its IUPAC name is 1-bromo-4-methoxybenzene, and Chemists have relied on it as a key intermediate for decades, producing specialty chemicals, pharmaceuticals, and agrochemicals. Recognized under the HS Code 29095090, 4-Bromoanisole falls into the category of aromatic ethers, which opens doors to a variety of syntheses and structural research.
This compound usually appears as a colorless to pale yellow crystalline solid. Sometimes it comes in flakes, powder, or even pearls, depending on storage and handling. The structural formula, C6H4BrOCH3, tells a simple story: a benzene ring, a methoxy (-OCH3) group at one end, with a bromine atom directly across from it at the para position. The presence of bromine on the aromatic ring pushes the molecular density up, making it heavier than many simple aromatic ethers. The specific density settles around 1.5 g/cm³ at 25°C; it feels heavier than water but lighter than metals and some densely packed organic solids. Melting point tends to fall near 34-38°C, which means a warm room or even body heat can soften or melt this material. Boiling point stretches past 230°C, so the compound handles moderate heating during synthesis or processing.
4-Bromoanisole is not water-soluble, which is common for many aromatic compounds. It’ll dissolve much more easily in organic solvents, like ethanol, diethyl ether, or chloroform. The methoxy group on the ring boosts stability against oxidation and keeps the brominated ring activated for further chemical reactions. Many chemists appreciate that 4-Bromoanisole stays stable under most common storage conditions — dry containers, kept away from strong acids and bases, protect it from sunlight. As a raw material, it acts as a versatile starting point for Suzuki coupling and other palladium-catalyzed cross-coupling reactions; having that bromo group on the ring positions it for easy substitution with other groups, giving access to a whole world of custom molecules.
Packaging comes in different forms, with users receiving crystal, flakes, powder, pearls, or sometimes a solution in organic solvents to make measuring easier. commercially, it is normally shipped in sealed plastic or glass containers, ranging from a few grams for research up to kilograms or even drums for manufacturing. Solid 4-Bromoanisole handles easily with basic personal protective equipment, but like most chemicals, spills on skin or eyes need washing right away. There’s a faint, slightly aromatic smell, nothing overpowering, but it's best handled in a well-ventilated area.
Handling 4-Bromoanisole, I’ve learned to respect personal safety—no shortcuts. It’s not the most volatile or acutely toxic chemical out there, but it can cause skin and eye irritation if mishandled. Prolonged or repeated skin contact dries out or sensitizes the skin, and inhaling vapors regularly, especially with poor ventilation, risks headaches or dizziness. Always store away from incompatible substances, such as strong oxidizers or acids, because hazardous decomposition can happen under extreme conditions. Disposal follows local chemical waste rules since release into drains could harm aquatic environments — the persistence of aromatic bromine compounds in water can damage delicate ecosystems. Consider replacing or minimizing brominated reagents if greener, non-halogenated alternatives are available; otherwise, use precise amounts, contain waste, and neutralize any spills quickly.
From my own work in the lab, having a solid and consistent supply of 4-Bromoanisole makes a huge difference. It allows custom syntheses of advanced materials without complicated purification steps. The bromo group’s reactivity gives chemists a smooth on-ramp for making biaryl compounds, functionalized aromatics, or fine chemicals. In pharmaceutical research, 4-Bromoanisole gives medicinal chemists a predictable base for attaching functional groups, so small adjustments in its structure lead to big shifts in biological activity. Agrochemical industries lean on it for the same reasons, building complex molecules that help protect crops or foster better growth through subtle chemical tweaks. The global demand remains steady, which keeps manufacturing and supply chains alive, but also means ongoing attention to quality, purity, and responsible handling will always matter. Reducing waste, keeping exposures low, and following robust safety protocols are just as important as the chemical itself on the bench or in production facilities.
