4,4′-Bis(chloromethyl)-1,1′-biphenyl is an organic compound featuring two chloromethyl groups attached to the para positions of a biphenyl structure. This compound is classified as a derivative of biphenyl and is recognized for its reactivity due to the presence of chloromethyl groups, which can participate in nucleophilic substitution reactions. As a versatile building block in organic synthesis, it is used to produce various polymers, pharmaceuticals, and specialty chemicals. Its properties are of interest in materials science and medicinal chemistry, where the modification of its structure can lead to new functional materials and bioactive compounds.