4-Nitrobenzyl alcohol #CAS619-73-8

4-Nitrobenzyl alcohol #CAS619-73-8

Light yellow crystals. Melting point: 92-93℃. Boiling point: 185℃ (1.6 kPa). Flash point: 180℃. Soluble in ethanol and ether, slightly soluble in water.

p-Nitrobenzyl alcohol exhibits extremely strong chemical reactivity. The nitro group in its structure has a strong electron-withdrawing effect, which significantly reduces the electron density of the benzene ring, making it difficult for it to undergo electrophilic substitution reactions. However, it can be efficiently converted into the corresponding p-aminobenzyl alcohol through methods such as iron powder acidic reduction, catalytic hydrogenation, or sodium sulfide reduction. Meanwhile, another active core of its structure is the hydroxymethyl group, which possesses the typical chemical properties of primary alcohols. Under mild oxidants (such as MnO₂, PCC, Swern oxidation), it can selectively oxidize to p-nitrobenzaldehyde, or under strong oxidants (such as potassium permanganate, potassium dichromate), it can be completely oxidized to p-nitrobenzoic acid. Additionally, this hydroxyl group is also highly prone to esterification reactions with carboxylic acids or acyl chlorides, or to react with halogenating agents (such as sulfoxide chlorides, tribromophosphine) to form corresponding p-nitrobenzyl halides. It is a core building block used in medicine and organic synthesis for introducing the nitrobenzyl protecting group.

Application Of 4-Nitrobenzyl alcohol

4-Nitrobenzenemethanol is a potential building block in the synthesis of various pharmaceuticals.

4-nitrobenzyl alcohol is used as the sole source of carbon and nitrogen to study the pathway for the catabolism of 4-nitrotoluene by Pseudomonas.

It has indispensable and widespread applications in pharmaceutical synthesis, development of sensitive protective groups, and the field of analyzing dyes. It is a key organic chemical building block for synthesizing antibiotics (such as chloramphenicol), antifungal drugs, and anti-tumor targeted molecules. Moreover, due to its excellent chemical stability towards nitrobenzyl (PNB) and its ease of removal under mild reduction conditions, it is widely used as a core photosensitive/chemosensitive protecting group precursor for protecting carboxyl, hydroxyl, or amino groups in the synthesis of peptides and amide-type drugs. Additionally, in materials science and analytical chemistry, it is often used as a special high-purity matrix for preparing matrix-assisted laser desorption ionization mass spectrometry (MALDI-MS), a special component of photoresist, and for synthesizing intelligent dye molecules that can change color and fluorescence in response to light or redox states.

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