Patent ID: 7202378
Filing Date: 2007-04-10
Classification: C07C

Abstract:
1. A process for producing 1,5-naphthalene diisocyanate comprising the steps of: reacting 4-(2-nitrophenyl)-n-butyronitrile with an acid or a base to produce 4-(2-nitrophenyl)-n-butyric acid; optionally chlorinating the 4-(2-nitrophenyl)-n-butyric acid to produce 4-(2-nitrophenyl)-n-butyryl chloride; cyclizing the 4-(2-nitrophenyl)-n-butyric acid or the 4-(2-nitrophenyl)-n-butyryl chloride to produce 5-nitro-3,4-dihydro-1(2H)-naphthalinone; aminating the 5-nitro-3,4-dihydro-1(2H)-naphthalinone to produce 5-nitro-3,4-dihydro-1(2H)-naphthylamine or the tautomeric 5-nitro-3,4-dihydro-1(2H)-naphthylimine; aromatizing the 5-nitro-3,4-dihydro-1(2H)-naphthylamine or the tautomeric 5-nitro-3,4-dihydro-1(2H)-naphthylimine to produce 5-nitro-1-naphthylamine and/or 5-nitroso-1 -naphthylamine; hydrogenating the 5-nitro-1-naphthylamine and/or 5-nitroso-1-naphthylamine to produce 1,5-naphthalenediamine; and reacting the 1,5-naphthalenediamine with phosgene to produce 1,5-naphthalene diisocyanate.