9902.05.30 - Triphenyl phosphine (CAS No. 603-35-0) (provided for in subheading 2931.39.00)

This HTS code, 9902.05.30, specifically covers Triphenyl phosphine (CAS No. 603-35-0). This chemical compound is primarily recognized for its role as a ligand in coordination chemistry and as a reagent in organic synthesis, particularly in Wittig and Mitsunobu reactions. Its inclusion within Chapter 99 signifies that it is subject to temporary legislation, modifications, or additional import restrictions as proclaimed under specific trade agreements or Section 22 of the Agricultural Adjustment Act.

Given that this is a leaf node, there are no direct subcategories to introduce. Therefore, understanding the practical classification criteria for this specific item involves recognizing its chemical identity and its provision within the broader HTS structure. The reference to subheading 2931.39.00 indicates its underlying classification under the general group for organo-inorganic compounds, distinguishing it from other organic or inorganic chemical products not possessing this specific chemical structure and function. Its classification under 9902.05.30 means it is currently subject to specific, temporary trade provisions that supersede its standard classification under Chapter 29.