| abstract |
The present invention relates to a kind of method for preparing isocyanate compound, it comprises the following steps：A) the amines A and CO with least one primaquine group are made 2 And organo-tin compound S reactions, so that at least one in the primaquine group in amines A is converted into carbamate groups, there is the group OR of at least one tin atom for being connected to organo-tin compound so as to obtain carbamate compounds C, the organo-tin compound S 3 , wherein R 3 It is the organic group of the C bondings with 1 to 30 carbon atom, wherein 1,2 or 3 carbon atom can be substituted by oxygen or nitrogen；B) carbamate groups in the carbamate compounds C obtained in step a) are cracked to form isocyanate compound and alcohol R 3 OH, the tin compound formed in step a) is not separated；C) isocyanate compound is obtained from step b) reactant mixture. |