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