Diphenylsilanediol (CAS No. 947-42-2) is an important organosilicon compound, also known as dihydroxydiphenylsilane. NIST data confirms its molecular formula as C12H12O2Si and its molecular weight as 216.308 g/mol.

Structurally, the silicon atom in diphenylsilanediol is bonded to two phenyl groups and two hydroxyl groups; it can be viewed as an organosilicon intermediate featuring reactive Si–OH groups and phenyl structures. This structural configuration allows it not only to participate in condensation reactions but also to incorporate phenyl groups into the structures of subsequent organosilicon polymers.

One of the most significant applications of CAS 947-42-2 is its use as a raw material for synthesizing phenyl-based organosilicon materials. Publicly available information indicates that it is used to synthesize phenyl silicone oils, phenyl silicone resins, and phenyl silicone rubbers, and also serves as a structure-control agent during silicone rubber processing.

Furthermore, diphenylsilanediol is a key intermediate in the production of octaphenylcyclotetrasiloxane. Published patents describe the use of diphenylsilanediol as an intermediate to synthesize octaphenylcyclotetrasiloxane, which is subsequently utilized in high-temperature phenyl silicone resin systems.