4-Cyanobenzyl alcohol is an organic compound featuring a benzene ring substituted with a cyano group and a hydroxymethyl group at the para positions. It is a white to off-white crystalline solid with a molecular formula of C8H7NO. This compound serves as a versatile building block in organic synthesis. The reactive hydroxyl group can be readily converted into various functional groups such as halides, esters, or ethers, while the cyano group can be hydrolyzed to a carboxylic acid or reduced to an amine. Its primary application is in the synthesis of advanced materials, particularly as a key precursor for hole-transporting materials (HTMs) and electron-transporting materials (ETMs) used in organic light-emitting diodes (OLEDs) and other organic electronic devices. It is also used in pharmaceutical and agrochemical research for constructing more complex molecular architectures. 4-Cyanobenzyl alcohol should be handled with care in a well-ventilated area, using appropriate personal protective equipment as it may cause skin and eye irritation.