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Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR) Bengaluru 
A Process for Bromination of Arylene Dianhydrides and a Method of Synthesis of Diimides Thereof 
Govindaraju Thimmaiah, Venkata Suseela Yelisetty 
Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR) Bengaluru 
Application type:
Granted - 2019-12-02 
Application Number:
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Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR) Bengaluru 
The present disclosure relates to a process for bromination of arylene dianhydrides, particularly1,4,5,8-naphthalenetetracarboxylic dianhydride (NDA) using 5,5-dimethyl-1,3- dibromohydantoin (DBH) and tribromoisocyanuric acid (TBCA) as brominating agents. The disclosure further relates to condensation of the brominated dianhydrides with amines to yield corresponding imides, particularly naphthalene diimides (NDI) which are versatile precursors for the synthesis of core functionalized naphthalene diimides. The use of DBH or TBCA asbrominating agents are not only restricted to arylene dianhydrides in the present disclosure as they can also be used for brominating any aromatic or unsaturated compounds.  

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