4,4'-(Ethene-1,2-diyl)diphenol, also known as 4,4'-dihydroxystilbene, is a specialty chemical intermediate with a rigid conjugated structure. It is primarily used in organic synthesis as a building block for high-performance polymers, including liquid crystalline polyesters and polyethers, leveraging its stilbene moiety for enhanced thermal stability and optical properties. The compound finds applications in the production of dyes, optical brighteners, photoactive materials, and electronic components such as OLEDs and photovoltaic devices. Additionally, it serves as a precursor in the synthesis of flame retardants, antioxidants, and pharmaceutical intermediates due to its reactive phenolic groups and potential for derivatization.