2921.19.31.00 - 3-Amino-3-methyl-1-butyne; (Dimethylamino)isopropyl chloride hydrochloride

This HTS classification, 2921.19.31.00, specifically covers certain acyclic monoamines and their derivatives, as well as their salts. The key products within this subheading are 3-Amino-3-methyl-1-butyne and (Dimethylamino)isopropyl chloride hydrochloride. These are distinct chemical compounds with specific structural characteristics that place them outside of more broadly defined amine categories.

Distinguishing this category from its siblings, 2921.19.11.00 covers simpler mono-, di-, and trialkylamines such as ethylamines and propyl/butyl monoamines, along with their salts. In contrast, 2921.19.31.00 addresses more complex or substituted acyclic monoamines where the amine group is attached to a carbon chain with additional functional groups or branching, as exemplified by the alkyne functionality in 3-Amino-3-methyl-1-butyne and the hydrochloride salt of a tertiary amine in (Dimethylamino)isopropyl chloride hydrochloride. The "Other" sibling category, 2921.19.61, serves as a residual category for acyclic monoamines not otherwise specified.

As this subheading is a leaf node, there are no further subdivisions. Classification under 2921.19.31.00 is therefore determined by the specific identity of the imported substance matching either 3-Amino-3-methyl-1-butyne or (Dimethylamino)isopropyl chloride hydrochloride, or chemically equivalent compounds that meet the structural and functional criteria of an acyclic monoamine derivative not classified elsewhere within the 2921.19 subgroup.