Patent · US Expired

2,2-Bis[4-(2,3-dibromopropoxy)-3,5-dibromophenyl]-propane process

US4302614A · kind A · utility

13Cited by

1References

12Claims

0Family size

Assignee

Riedel-De Haen Aktiengesellschaft · DE

Inventors

Wolfgang Dannenberg · Wunstorf, DE
Walter Heyer · Barsinghausen, DE
Theo Doldissen · Seelze, DE
Manfred Zimmermann · Monheim, DE

Key dates

Filing date	Feb 11, 1980
Grant date	Nov 24, 1981
Priority date	—
Expiry date	Feb 11, 2000

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07C43/225
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

2,2-Bis[4-(2,3-dibromopropoxy)-3,5-dibromophenyl]-propane (BDDP) has the structural formula ##STR1## This bisphenol-A derivative is prepared by reaction of 2,2-bis[4-hydroxy-3,5-dibromophenyl]-propane with an allyl halide and subsequent bromination of the diallyl ether obtained. In the first reaction step, a lower aliphatic alcohol is used as solvent, and in the second reaction step an aromatic halogenated hydrocarbon. The reaction product is then precipitated by excess alcohol, and separated. The BDDP is obtained in the form of granules and is suitable for application as flameproofing agent.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.