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Methyltriphenylphosphonium Bromide from Mexico

Methyltriphenylphosphonium bromide is a phosphonium salt used in Wittig reagent preparation for olefin synthesis. Classified under 2931.90.90.52 as an organo-inorganic compound per Chapter 29 note (C)(1) for organic salts.

Duty Rate — Mexico → United States

13.7%

Rate breakdown

9903.05.5510%Section 301 (forced labor) — additional 10% ad valorem on products of Mexico

Import Tips

Hygroscopic; specify anhydrous grade and include retest date on labeling

Phosphorus compounds monitored under Chemical Weapons Convention; declare quantities

Confirm quaternary phosphonium structure to avoid organic phosphorus misclassification