3,6-Endoxo-1,2,3,6-tetrahydrophthalic anhydride
Bicyclic cyclenic anhydride featuring oxygen-bridged norbornene structure with fused phthalic anhydride. Covered by HTS 2917.20.00.00 as cyclenic polycarboxylic acid derivative. Key monomer for high-temperature resistant polymers.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If epoxide functionality present
Epoxides classified earlier in 2932 regardless of carboxylic content.
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Import Tips & Compliance
• Distinguish exo/endo isomers via NMR; both cyclenic but different reactivity profiles
• Provide Diels-Alder reaction synthesis documentation confirming structure
• Monitor double bond content as full hydrogenation changes to hexahydro version
Related Products under HTS 2917.20.00.00
Cyclohexane-1,2-dicarboxylic acid
Cyclohexane-1,2-dicarboxylic acid is a cyclanic polycarboxylic acid with two carboxyl groups attached to a cyclohexane ring. It falls under HTS 2917.20.00.00 as a separate chemically defined organic compound of the cyclanic polycarboxylic acids category. This compound is used in the production of plasticizers and resins.
Hexahydrophthalic anhydride
Hexahydrophthalic anhydride is the cyclic anhydride of cyclohexane-1,2-dicarboxylic acid, a derivative specifically covered by HTS 2917.20.00.00. This cyclanic compound is widely used in epoxy resin curing agents and alkyd resin production. It qualifies as a chemically defined derivative of cyclanic polycarboxylic acids.
Cyclohexane-1,4-dicarboxylic acid
A symmetrical cyclanic polycarboxylic acid with carboxyl groups at the 1 and 4 positions of the cyclohexane ring. Classified under HTS 2917.20.00.00 as a separate chemically defined cyclanic polycarboxylic acid. Used in polyester resin synthesis and pharmaceutical intermediates.
Bicyclo[2.2.1]heptane-2,3-dicarboxylic anhydride
Also known as nadic anhydride, this bicyclic cyclanic derivative features a norbornane structure with fused anhydride functionality. Falls under HTS 2917.20.00.00 as a cyclanic polycarboxylic acid anhydride. Primarily used in high-performance epoxy resins for aerospace composites.
Tetrahydrophthalic anhydride
Tetrahydrophthalic anhydride is a partially hydrogenated cyclanic polycarboxylic acid anhydride covered by HTS 2917.20.00.00. The cyclohexene ring structure qualifies as cyclenic per the heading description. Widely used in unsaturated polyester resins and alkyd coatings.
Camphoric acid
Camphoric acid (1,2,2-trimethylcyclopentane-1,3-dicarboxylic acid) is a naturally-derived cyclanic polycarboxylic acid classified under HTS 2917.20.00.00. This bicyclic terpenoid structure fits the cycloterpenic subcategory. Used in pharmaceutical synthesis and fragrance chemistry.