FIELD: chemistry.
SUBSTANCE: invention relates to crystalline form 6,6'-[[3,3',5,5'-tetrakis(1,1-dimethylethyl)-[1,1'-biphenyl]-2,2'-diil]bis(oxy)]bisdibenzo[d,f][1,3,2]-dioxaphosphepine Formula (I), demonstrating two high-intensity reflections, indicated in form of values 2Θ, at 7.8±0.2° and 19.7±0.2° on an X-ray powder diffractogram, obtained at 25 °C using Cu-Kα radiation; where the crystalline form does not contain a solvent; and where crystalline form has melting point of 202–208 °C.
(I).
EFFECT: technical result is thermally stable form of 6,6'-[[3,3',5,5'-tetrakis(1,1-dimethylethyl)-[1,1'-biphenyl]-2,2'-diil]bis(oxy)]bisdibenzo[d,f][1,3,2]-dioxaphosphepine.
6 cl, 1 tbl, 3 ex, 9 dwg
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