1970•Journal of the Chemical Society A Inorganic Physical TheoreticalRequires access

Preparation of 2,5-diaminoterephthalic acid by the Hofmann degradation of pyromellitic di-imide (benzene-1,2,4,5-tetracarboxylic 1,2:4,5-di-imide) in the presence of metal salts

Nobumasa Hōjō, Hajime Yoneno

Abstract

Hofmann degradation of pyromellitic di-imide gave a mixture of 4,6-diaminoisophthalic acid and 2,5-diminoterephathalic acid. Degradation of the copper of cobalt chelates of pyromellitic di-imide, or of pyromellitic di-imide in the presence of cupric or cobaltic salts, gave 2,5-diaminoterephthalic acid only. This is interpreted in terms of the structure of the chelates.

About this research paper

What this paper is about

Why it matters

OpenAlex reports 3 citations for this work. Citation counts describe recorded attention and do not establish research quality.

Key contribution

A contribution statement is not available in the OpenAlex record.

Method / approach

Method details are not available in the OpenAlex metadata.

Main findings

Findings are not separately available in the OpenAlex metadata.

Limitations

Limitations are not available in the OpenAlex metadata.

Applications

Application details are not available in the OpenAlex metadata.

Available abstract

Key concepts: Imide, Pyromellitic dianhydride, Chemistry, Degradation (telecommunications), Chelation, Benzene, Cobalt, Copper