2812.17.00.00 - Thionyl chloride

This classification specifically covers thionyl chloride, a inorganic chemical compound with the formula SOCl₂. Thionyl chloride is a colorless to pale yellow liquid with a pungent odor, widely utilized as a chlorinating agent in organic synthesis. Its primary applications include the conversion of carboxylic acids to acyl chlorides and alcohols to alkyl chlorides, playing a crucial role in the production of pharmaceuticals, agrochemicals, and dyes.

Within the broader category of "Chlorides and chloride oxides," thionyl chloride is distinct from its sibling entries due to its unique chemical composition and reactivity. For instance, it differs from carbonyl dichloride (phosgene, 2812.11.00.00) and the various phosphorus chlorides (2812.12.00.00 to 2812.14.00.00) by containing sulfur as the central atom in its oxide structure. Similarly, it is differentiated from sulfur monochloride (2812.15.00.00) by the presence of oxygen and its specific structure.

As a leaf node in the Harmonized Tariff Schedule, 2812.17.00.00 does not have further subcategories. Therefore, classification under this code is determined by the precise identification of the substance as thionyl chloride. Importers and exporters must ensure that the declared commodity accurately matches the chemical identity and properties of thionyl chloride, adhering to any specific documentation requirements for hazardous chemical substances.