Process for preparing 1,3,6,8-tetrabromopyrene

Details Process for preparing 1,3,6,8-tetrabromopyrene Process for preparing 1,3,6,8-tetrabromopyrene

1986-09-12

1987-08-04

Evans, J. E.

Organic compounds -- part of the class 532-570 series

Organic compounds

Halogen containing

C07C 1702

Patent

active

046847537

ABSTRACT:
Process for preparing 1,3,6,8-tetrabromopyrene by brominating pyrene in aqueous suspension with simultaneous reoxidation of the resulting hydrogen bromide to bromine by means of an oxidizing agent, which comprises reacting pyrene in a highly concentrated aqueous suspension having a pyrene-water weight ratio of 1:1.2 to 2 with bromine at temperatures of 40.degree. to 65.degree. C. with simultaneous reoxidation of the resulting hydrogen bromide to bromine using an oxidizing agent, completing the bromination by heating the reaction mixture to temperatures of 70.degree. to 130.degree. C., reducing excess bromine with a reducing agent to hydrogen bromide and subjecting the 1,3,6,8-tetrabromopyrene formed, preferably without intermediate isolation, to an alkaline aftertreatment at temperatures of 40.degree. to 100.degree. C. within the pH range 8.5 to 12.

REFERENCES:
Vollman et al., Ann. 531, pp. 12 and 16 (1937).

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