2907.29.15.00 - 4,4'-Biphenol

This HTS subheading, 2907.29.15.00, specifically covers 4,4'-Biphenol. 4,4'-Biphenol is an organic compound characterized by two phenol groups linked together by a direct carbon-carbon bond at the para positions of their respective aromatic rings. It is distinct from other polyphenols and phenol-alcohols classified within the broader 2907.29 category by its specific structure and bonding.

Unlike sibling categories such as pyrogallic acid (2907.29.10.00) or tert-butylhydroquinone (2907.29.25.00), which have different substituent groups or arrangements, 4,4'-Biphenol's classification is determined by the presence of the two directly linked phenolic rings. It is also differentiated from the general "Other" category (2907.29.90.00) by its precisely defined chemical structure, making it a distinct and individually classified chemical substance.

As a leaf node within the HTS structure, 2907.29.15.00 does not have further subcategories. Classification within this specific code relies on the definitive identification of the substance as 4,4'-Biphenol. This compound is primarily used as a monomer in the production of polymers, such as liquid crystal polymers and polycarbonates, and as an intermediate in the synthesis of other organic chemicals, reflecting its importance in industrial chemical processes.