| 摘要 |
64693-4280 High purity nitro-1,3-benzenediols and amino -1,3-benzenediols are prepared by (a) contacting a 1,3-bis(alkylcarbonato)benzene with a nitrating agent under reaction conditions such that a 1,3-bis(alkyl-carbonato)nitrobenzene is formed, (b) contacting the 1,3-bis(alkylcarbonato)nitrobenzene with a hydrolyzing agent under conditions such that a nitro-1,3-benzenediol is produced, and optionally (c) contacting the nitro -1,3-benzenediol with a reducing agent under conditions such that an amino-1,3-benzenediol is produced. Bis(alkylcarbonato)nitrobenzene intermediates are also claimed. Of the amino-1,3-benzenediols, 4,6-diamino- -1,3-benzenediol is particularly useful in the preparation of high molecular weight polybenzoxazoles. 35,117-F |
