Organic compounds -- part of the class 532-570 series – Organic compounds – Carboxylic acid esters
Patent
1980-08-18
1982-03-23
Breitenstein, G. T.
Organic compounds -- part of the class 532-570 series
Organic compounds
Carboxylic acid esters
560 25, 260453P, C07C125065, C07C125073
Patent
active
043214029
ABSTRACT:
In the process of producing an aromatic polyisocyanate from a methylated benzene compound having the sequential steps of ammoxidation, hydrolysis, conversion of amide to carbamate, condensation and conversion of polycarbamate ester to polyisocyanate, the improvement of converting said amide to said carbamate in a one-step reaction wherein said amide is reacted with an N-halogenating agent in the presence of alcohol and in a reaction medium having a pH of from neutral to basic and a temperature greater than 40.degree. C.
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Drogin Robert
Rao Krishna K.
Ryu Ji-Yong
Spohn Ralph J.
Breitenstein G. T.
Dexter Roland A.
Exxon Research & Engineering Co.
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