2909.19.18.00 - Other

This HTS category, 2909.19.18.00, encompasses a residual group of acyclic ethers derived from monohydric alcohols. These compounds are characterized by the presence of at least one ether linkage (-O-) where the oxygen atom is bonded to two alkyl groups, and at least one of these alkyl groups is derived from a monohydric alcohol (an alcohol with a single hydroxyl group). This classification is broad and captures ethers not specifically enumerated elsewhere within the acyclic ether subheadings.

The distinguishing feature of this category lies in its residual nature. It serves as a catch-all for acyclic ethers of monohydric alcohols that do not meet the specific criteria for other, more narrowly defined subheadings. For example, while this category would include many complex acyclic ethers, it would not include methyl tertiary-butyl ether (MTBE), which is specifically classified under 2909.19.14.00 due to its widespread use as a gasoline additive and its distinct chemical structure.

As this is a leaf node within the HTS, there are no further subcategories to introduce. Classification into this specific code requires a thorough review of the chemical structure to confirm it is indeed an acyclic ether of a monohydric alcohol and that it does not fall under any preceding, more specific classifications. The exclusion of halogenated, sulfonated, nitrated, or nitrosated derivatives, which would be classified in separate subheadings, is also a key consideration.