Patent ID: 6222065
Filing Date: 2001-04-24
Classification: C07C

Abstract:
A process for the production of 1,5-naphthylenediisocyanate, comprisingthe first reaction step of amidating 1,5-naphthylenedinitrile in water-containing dimethylsulfoxide in the presence of an inorganic strong base, to prepare 1,5-naphthylenedicarboxylic acid amide,the second reaction step of reacting the 1,5-naphthylenedicarboxylic acid amide with chlorine in a solvent, to prepare 1,5-naphthylenedicarboxylic acid-bis-N-chloroamide,the third reaction step of reacting the 1,5-naphthylenedicarboxylic acid-bis-N-chloroamide with an alcohol in the presence of a basic compound, to prepare 1,5-bis(alkoxycarbonylamino)naphthalene, andthe fourth reaction step of pyrolyzing 1,5-bis(alkoxycarbonylamino)naphthalene in an inert solvent to obtain 1,5-naphthylenediisocyanate.