2,4,8-Trichloro-tri and tetra bromodibenzofurans

Details 2,4,8-Trichloro-tri and tetra bromodibenzofurans 2,4,8-Trichloro-tri and tetra bromodibenzofurans

1974-03-07

1976-01-27

Ford, John M.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

252 81, 106 15FP, C07D30791

Patent

active

039352510

ABSTRACT:
Polyhalogenated dibenzofuranes having at least six halogen atoms are prepared by halogenation of 2,4,8-trichlorodibenzofurane or of dibenzofurane. The halogenation may be achieved by Cl.sub.2, Br.sub.2, SO.sub.2 Cl.sub.2, S.sub.2 Cl.sub.2 or similar halogen donors. The products are flameproofing agents for polymers, especially for polyesters and polyolefins. Examples are octachloro-, trichlorotribromo- and trichlorotetrabromo-benzofurane.

REFERENCES:
patent: 2076430 (1937-04-01), Hanson et al.
patent: 3201418 (1965-08-01), McCall et al.
Plimmer et al., J. Agr. Food Chem., Vol. 21, No. 1, 1973, p. 90-93.

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