2931.90.90.52/Methyltriphenylphosphonium Bromide/Japan

Methyltriphenylphosphonium Bromide from Japan

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 — Japan → United States

12.5%

Rate breakdown

9903.05.4912.5%Section 301 (forced labor) — Japan (col1 rate < 12.5 percent): MFN < 12.5% → total duty capped at 12.5%

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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