Process for the production of diisocyanates, selected diisocyana

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

1987-08-12

1989-04-11

Siegel, Alan

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

Organic compounds

Isocyanate esters

560358, C07C 6900

Patent

active

048208663

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 diamine is phosgenated to produce the corresponding diisocyanate. The resultant diisocyanates may then be used as starting materials in polyisocyanate addition processes.

REFERENCES:
patent: 4328166 (1982-05-01), Fujita et al.
patent: 4597910 (1986-07-01), Konig et al.
Chemical Abstracts, Jan. 10, 1955, No. 1, vol. 49, F. H. McMillan, "Diaryloxyalkane Derivates".
Chemistry of Ether Linkage, S. Patai, 1967, pp. 450 et seq., Interscience Publishers.
Houben Weyl, vol. VI/3, p. 77.

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