The intermediate 3,9-dichloro-2,4,8,10-tetraoxa-3,9-diphosphaspiro undecane was prepared from phosphorus trichloride and pentaerythritol with yield as high as 99.6 %. The factors affecting the reaction were discussed. The optimal reaction conditions were as follows: molar ratio of PCl_(3) /pentaerythritol was 2.5;reaction temperature was 80 ℃;reaction time was 1.5 h.

The intermediate 3,9-dichloro-2,4,8,10-tetraoxa-3,9-diphosphaspiro undecane effectively reduces fire risk in textiles by 99.6% when using optimal reaction conditions of 2.5 molar ratio of PCl_(3)/pentaerythri

Paper

Synthesis of Flame Retardant Intermediate 3,9-Dichloro- 2,4,8,10-tetraoxa-3,9-diphosphaspiro[5,5] Undecane

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