2918.30.15.00 - 2-Chloro-4,5-difluoro-ß-oxobenzenepropanoic acid, ethyl ester; and Ethyl 2-keto-4-phenylbutanoate

This classification covers carboxylic acids that also possess an aldehyde or ketone functional group, but do not contain any other oxygen-containing functional groups. These compounds and their derivatives, including anhydrides, halides, peroxides, and peroxyacids, are specifically aromatic in nature. The presence of a carbonyl group directly attached to the benzene ring, or in a position that creates an aromatic ketone or aldehyde functionality, is the defining characteristic for inclusion within this heading.

Within this aromatic subgroup, the distinction is made based on the specific chemical structure and substituents. For instance, this category is differentiated from its sibling, 2918.30.10.00, which specifically enumerates "1-Formylphenylacetic acid, methyl ester." The goods covered here include specific examples such as "2-Chloro-4,5-difluoro-ß-oxobenzenepropanoic acid, ethyl ester" and "Ethyl 2-keto-4-phenylbutanoate," highlighting the diversity of aromatic keto-acids and their esters that fall outside of the more narrowly defined sibling entry.

As this is a leaf node, there are no further subcategories. Therefore, the classification of goods under 2918.30.15.00 relies on a direct match to the specified chemical names or structures, ensuring precise identification of aromatic carboxylic acids with ketone functionality and their derivatives when no other oxygen functions are present. The inclusion of specific examples serves to guide customs officials in correctly identifying and classifying these chemical compounds.