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Organic Building Blocks

Nitro, Azo & Hydrazine Compounds

Nitroarenes, aryl hydrazines, azo compounds and nitro heterocycles for reduction to amines, Fischer indole synthesis and dye chemistry.
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Nitro, azo and hydrazine compounds share a nitrogen-rich chemistry that feeds dye manufacture, explosives research and, most often, pharmaceutical synthesis. Nitroarenes are reduced to anilines, while aryl hydrazines build indoles and pyrazoles. This sub-category includes 1-Bromo-4-fluoro-3-nitrobenzene, 1,2-Dinitrobenzene, 1-(difluoromethyl)-4-nitrobenzene, 1-(5-Methyl-2-nitrophenyl)ethanone and (3-Fluorophenyl)hydrazine hydrochloride.

Halogenated nitrobenzenes are valuable because the nitro group activates the ring for nucleophilic aromatic substitution, and the position of each substituent decides which halogen reacts first. Buyers should confirm the substitution pattern carefully. Hydrazines are reducing agents and can be toxic and sensitising, so they are often supplied as more stable hydrochloride salts. Store free hydrazines cold, under nitrogen and away from oxidising agents.

Some polynitro compounds are energetic and travel with restrictions, which we check during quotation. All items ship in sealed containers with a COA and SDS. Gram to kilogram quantities are available for most intermediates.

Nitro, Azo & Hydrazine Compounds: questions buyers ask

How are aryl hydrazines used in the Fischer indole synthesis?
An aryl hydrazine condenses with a ketone or aldehyde to form a hydrazone, which rearranges under acid catalysis to give an indole. Substituents on the hydrazine end up on the indole benzene ring. The method is used for triptan drugs, indole alkaloids and many research compounds.
Which halogen reacts first in a halonitrobenzene?
In nucleophilic aromatic substitution, halogens ortho or para to the nitro group react much faster than those meta to it. Fluorine is usually the best leaving group in these reactions, ahead of chlorine and bromine. This lets chemists substitute one position selectively and keep another halogen for later cross-coupling.
Are nitro compounds dangerous to ship?
Most mono-nitro aromatics ship as toxic or harmful substances under normal dangerous-goods rules. Compounds with several nitro groups, or nitro groups combined with other energetic features, may be classed as explosives or desensitised explosives with tight limits. We check the classification for each item and advise the permitted route.

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