Process for producing 1,3-bis(3-aminophenoxy) benzene
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- 三井化学FINE株式会社
- Publication Date
- 2003-11-19
- Estimated Expiration
- Not applicable · inactive patent
Abstract
Description
technical field
[0001] The present invention relates to a process for the preparation of 1,3-bis(3-aminophenoxy)benzene, which is useful as a raw material for, inter alia, adhesive polyimide resins, and as a heat-resistant polymer, especially It is a polyether-polyamine compound of a polyimide raw material; and relates to an intermediate for preparing 1,3-bis(3-aminophenoxy)benzene. Background technique
[0002] As a method for producing 1,3-bis(3-aminophenoxy)benzene, US Patent No. 4222962 describes the reaction between 1,3-dibromobenzene and an alkali metal salt of 3-aminophenol. However, in this method, the reactivity of the second step was poor and the yield was as low as 65%.
[0003] Also described in JP-A-03-255058 is a process involving the reaction of 1,3,5-trichlorobenzene with an alkali metal salt of 3-aminophenol to form two ether linkages followed by hydrogenolytic elimination using a noble metal catalyst residual chlorine. However, in the method described in...