2905.19.90.05 - 3,3-Dimethylbutan-2-ol (pinacolyl alcohol)

This classification pertains to acyclic, saturated monohydric alcohols that do not fall under the specific subheadings for decyl or hexyl alcohols and their isomers. These alcohols are characterized by a single hydroxyl (-OH) group attached to a saturated carbon chain, and they are not part of a ring structure. The catch-all nature of this category means it encompasses a wide array of such compounds, provided they meet the general criteria for saturated monohydric alcohols.

Distinguishing this category from its siblings, 2905.19.90.10 (Decyl alcohol and isomers thereof) and 2905.19.90.20 (Hexyl alcohol and isomers thereof), is crucial. Those headings specifically enumerate alcohols with a ten-carbon (decyl) or six-carbon (hexyl) chain, including all possible structural arrangements of these carbon lengths with a single hydroxyl group. This current subheading, 2905.19.90.05 (3,3-Dimethylbutan-2-ol (pinacolyl alcohol)), and others under the ".90" suffix, cover all other saturated acyclic monohydric alcohols that do not meet the specific carbon chain lengths defined in the preceding sibling categories.

As a leaf node within the HTS, this classification does not have further subcategories. Therefore, the classification of a specific alcohol under this heading relies entirely on its chemical structure and the elimination of it fitting into any more specific sibling categories. For instance, 3,3-Dimethylbutan-2-ol, with its eight-carbon backbone (considering isopropyl and tert-butyl components), is classified here because it is a saturated acyclic monohydric alcohol and does not fit the decyl or hexyl alcohol definitions. The primary classification criteria involve verifying the absence of unsaturation, the presence of a single hydroxyl group on an acyclic carbon chain, and the carbon chain length not being specifically enumerated elsewhere.