CAS 65481-32-7 3,9-Dimethylspiro[5.5]undecane Phosphonate Dioxide
Identified by CAS 65481-32-7, this is pure 3,9-dimethyl-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5.5]undecane 3,9-dioxide, a building block for organophosphorus ligands. HTS 2931.48.00.00 covers it as a non-halogenated organo-phosphorus derivative.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If classified as other organo-inorganic with additional non-P elements
Residual 'other' in 2931.90 catches compounds not specified earlier, per numerical order rule.
If nitrogen-function compounds with P incidental
Nitrogen functions in 2920 take precedence if primary over organo-inorganic.
If for rubber/plastic accelerators emphasizing end-use
Prepared rubber accelerators classify in Chapter 38 if not pure compounds.
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Import Tips & Compliance
• Reference CAS number on all shipping docs for rapid identification
• Ensure no impurities push it into mixtures excluded by Chapter notes
• Use UN-approved packaging for phosphorus compounds
Related Products under HTS 2931.48.00.00
3,9-Dimethyl-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5.5]undecane 3,9-dioxide
This is a specific non-halogenated organo-phosphorus compound featuring a spirocyclic structure with two phosphonate groups, classified under HTS 2931.48.00.00 as an organo-inorganic compound where phosphorus is directly linked to carbon. It is used primarily as a synthetic intermediate in pharmaceutical and agrochemical production.
Antioxidant 552 (3,9-Dimethyl-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5.5]undecane 3,9-dioxide)
Antioxidant 552 is the commercial grade of 3,9-dimethyl-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5.5]undecane 3,9-dioxide, a non-halogenated organo-phosphorus stabilizer for polymers. It falls under HTS 2931.48.00.00 due to its specific spiro phosphonate structure with P-C bonds, as defined in Chapter 29 heading 2931.
DOPO Derivative 3,9-Dimethylspiro Phosphonate
A DOPO-based derivative, this compound is precisely 3,9-dimethyl-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5.5]undecane 3,9-dioxide, used in flame-retardant synthesis for electronics. Classified in HTS 2931.48.00.00 as a non-halogenated organo-phosphorus compound per Chapter 29 definitions.
Spiro Phosphonate Monomer for Polymer Synthesis
This research-grade spiro phosphonate monomer, chemically 3,9-dimethyl-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5.5]undecane 3,9-dioxide, is used in copolymer production. It qualifies under HTS 2931.48.00.00 for its organo-inorganic phosphorus structure excluding halogens.