2904.20 - Derivatives containing only nitro or only nitroso groups:

This HTS category, 2904.20, encompasses derivatives of hydrocarbons that exclusively feature nitro (-NO2) or nitroso (-NO) functional groups, without the presence of sulfo or halogen substituents. These compounds are characterized by the introduction of these nitrogen-oxygen containing groups into the hydrocarbon structure, altering their chemical properties and potential applications. Examples within this broad classification could include various nitrated aromatic or aliphatic hydrocarbons, which serve as intermediates in the synthesis of dyes, explosives, pharmaceuticals, and other fine chemicals.

To differentiate this category from its siblings, it is important to note the absence of sulfo groups (covered in 2904.10) and halogen atoms. While sibling category 2904.10 specifically deals with sulfonated derivatives, and other sub-classifications under 2904 might cover halogenated compounds, this node is strictly limited to nitro or nitroso functionalization. This distinction is critical for accurate customs declarations, as the chemical reactivity and subsequent tariff treatment can vary significantly based on the dominant functional groups present.

Within this category, further subdivisions exist to classify specific nitro or nitroso derivatives based on their chemical structure and common nomenclature. For instance, subcategories like p-Nitrotoluene and Trinitrotoluene identify specific nitrated aromatic compounds with distinct applications. Other entries, such as artificial musks, highlight specialized nitro-containing compounds. The "Nitrated benzene, nitrated toluene (except p-nitrotoluene), or nitrated naphthalene" entry serves as a broader catch-all for other similar compounds not otherwise specified, allowing for comprehensive classification of a wide range of nitro-functionalized hydrocarbons.