Ethyl Methylphosphonic Acid (EMPA)
Ethyl methylphosphonic acid (CH3P(O)(OH)(OC2H5)) is a hydrolysis product of nerve agents, featuring phosphorus bonded to one methyl group and one ethyl group with no additional carbon atoms. Classified under HTS 2930.90.9225 due to its specific phosphorus substitution pattern matching the heading description. Used in chemical analysis and degradation studies.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If containing additional heteroatoms or classified as other organo-inorganic
Chapter notes direct compounds with multiple heteroatom-carbon linkages to later headings in 2931.
If for phosphonic acids without the specific alkyl limitation
General phosphonic acids with broader carbon substitution fall under heading 2919 oxygen-function compounds.
If impure technical grade with significant inorganic content
High inorganic salt content may classify as other salts of inorganic acids per Section VI notes.
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Import Tips & Compliance
• Submit NMR spectra confirming P-CH3 and P-OC2H5 bonds; critical for avoiding misclassification as general phosphonic acids
• Comply with Chemical Weapons Convention import notifications; subject to enhanced scrutiny and end-use certificates
• Label as research chemical only; commercial formulations may shift to pesticide classifications
Related Products under HTS 2930.90.92.25
Dimethyl Methylphosphonate (DMMP)
Dimethyl methylphosphonate is an organophosphorus compound with the formula CH3P(O)(OCH3)2, containing a phosphorus atom bonded to one methyl group and two methoxy groups with no other carbon atoms directly attached to phosphorus. It falls under HTS 2930.90.9225 as it precisely matches the chemical structure specified for phosphorus compounds with one methyl group. Commonly used as a flame retardant and chemical intermediate.
Methylphosphonic Dichloride
Methylphosphonic dichloride (CH3P(O)Cl2) contains phosphorus bonded solely to one methyl group and two chlorine atoms, fitting HTS 2930.90.9225's criteria for phosphorus compounds with specified alkyl groups. This reactive intermediate is used in organophosphorus synthesis. No other carbon atoms are present in the core structure.
Isopropyl Methylphosphonic Acid
Isopropyl methylphosphonic acid features phosphorus bonded to one methyl and one isopropyl group, precisely matching HTS 2930.90.9225's structural requirement. Used as a metabolite marker in pesticide and chemical weapons monitoring. The limited carbon attachment ensures chapter 29 classification.
n-Propyl Methylphosphonate
This compound has phosphorus attached to one methyl group and one n-propyl group, fitting HTS 2930.90.9225's narrow definition. Serves as a specialty solvent and reaction intermediate in pharmaceutical synthesis. Structure confirmed by P-NMR spectroscopy.