Process for the preparation of ar-amino-para-arenediols

Details Process for the preparation of ar-amino-para-arenediols Process for the preparation of ar-amino-para-arenediols

1990-04-06

1992-03-24

Dees, Jose G.

Organic compounds -- part of the class 532-570 series

Organic compounds

Carbonate esters

564418, C07C20918

Patent

active

050990578

ABSTRACT:
High purity amino-para-arenediols such as 2-nitro-1,4-benzenediol are prepared by (a) contacting a para-bis(alkylcarbonato)arene with a nitrating agent under reaction conditions such that a para-bis(alkylcarbonato)nitroarene is formed, (b) contacting the para-bis(alkylcarbonato)nitroarene with a hydrolyzing agent under conditions such that a nitro-para-arenediol is produced, and (c) contacting the nitro-para-arenediol with a reducing agent under conditions such that an amino-para-arenediol is produced. Of the amino-para-arenediols, 2-amino-1,4-benzenediol is particularly useful in the preparation of high molecular weight polybenzoxazoles.

REFERENCES:
patent: 4912246 (1990-03-01), Lysenko et al.

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