Aromatic diisocyanate and method of producing the same

Details Aromatic diisocyanate and method of producing the same Aromatic diisocyanate and method of producing the same

1996-09-23

1997-08-05

Barts, Samuel

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

Organic compounds

Isocyanate esters

560338, 560345, C07C26304

Patent

active

056544740

ABSTRACT:
Novel aromatic diisocyanate and a method of producing the same. The method comprises reacting a diamine compound with a chloroformate to produce an urethane intermediate, and then reacting the urethane intermediate with a halogenated organosilicon compound or a halogenated organoboron compound, using an organic solvent capable of dissolving both the diamine compound and the urethane intermediate. This method enables to produce the aromatic diisocyanate by one-pot. The aromatic diisocyanate has excellent various properties such as high heat resistance and chemical resistance.

REFERENCES:
patent: 4017459 (1977-04-01), Onder
"Conversion of Isocyanates to Carbodiimides Catalyst Studies", John J. Monagle, Nov., 1962.
"A Simple, Convienient, and Efficient Method for the Synthesis of Isocyanates from Urethanes", J. Org. Chem. 1995, 60, 257-258.
"A New Synthesis of Isocyanates and Isothiocyanates", Angew. Chem. internat. Edit/vol. 7(1968)/No. 12.

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