2931.51.00.00 - Methylphosphonic dichloride

This category encompasses methylphosphonic dichloride, a specific organo-phosphorus compound characterized by a methyl group attached to a phosphorus atom, which is further bonded to two chlorine atoms. It falls under the broader classification of halogenated organo-phosphorus derivatives due to the presence of chlorine substituents. These compounds are typically used as intermediates in the synthesis of other chemicals, including pesticides and flame retardants, owing to the reactivity of the dichloride functional group.

Methylphosphonic dichloride is distinguished from its siblings by its specific chemical structure. For instance, 2931.52.00.00 covers propylphosphonic dichloride, which differs in the alkyl group attached to the phosphorus atom. Similarly, 2931.53.00.00 and 2931.54.00.00 represent distinct organo-phosphorus compounds with different functional groups and applications, such as specific pesticide intermediates or established pesticides like Trichlorfon. The residual category, 2931.59.00, is reserved for other halogenated organo-phosphorus derivatives not specifically enumerated.

As this is a leaf node within the HTS classification system, there are no further subcategories. Therefore, classification under 2931.51.00.00 is determined solely by the chemical identity of methylphosphonic dichloride, a compound with a methyl group directly bonded to a phosphorus atom that also bears two chlorine atoms. The precise molecular structure and the absence of other specified functional groups are the key criteria for its classification.