Process for the production of diisocyanates, selected diisocyant

Details Process for the production of diisocyanates, selected diisocyant Process for the production of diisocyanates, selected diisocyant

1989-03-08

1990-04-03

Siegel, Alan

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

Organic compounds

Amino nitrogen containing

C07C 8511

Patent

active

049142380

ABSTRACT:
Diisocyanates corresponding to a specified formula are produced by reacting an alcohol corresponding to a specified formula with a nitrochlorobenzene in the presence of NaOH and/or KOH in powder form and a strongly polar, aprotic solvent to produce a dinitro compound corresponding to a specified formula. This dinitro compound is hydrogenated to form the corresponding diamine, which is phosgenated to produce the corresponding diisocyanate. The resultant diisocyanates may then be used as starting materials in polyisocyanate addition processes.

REFERENCES:
patent: 4328166 (1942-05-01), Fujita et al.
patent: 4597910 (1986-07-01), Konig
Chemistry of Ether Linkage, S. Patai, 1967, p. 450 et seq., Interscience Publishers.
Houben Weyl, vol. VI/3, p. 77.
Chemical Abstracts, Jan. 10, 1955, vol. 49, No. 1, F. H. McMillan, "Diaryloxyalkane Derivatives".

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