Isocyanates and their preparation using hypochlorous acid

Details Isocyanates and their preparation using hypochlorous acid Isocyanates and their preparation using hypochlorous acid

1992-12-28

1994-06-07

Dees, Jose G.

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

Organic compounds

Isocyanate esters

560330, 560355, 564123, 564152, 564192, 564215, C07C26300

Patent

active

053191331

ABSTRACT:
The present invention relates to a process for preparation of an isocyanate comprising (a) reacting an amide with an aqueous solution of hypochlorous acid in the presence of an water-immiscible organic solvent to produce an N-chloro amide; and (b) reacting said N-chloro amide with a base in the presence of a phase transfer catalyst and a water immiscible organic solvent to produce an isocyanate.

REFERENCES:
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patent: 5068408 (1991-11-01), Raynor et al.
patent: 5070200 (1991-12-01), Raynor et al.
Lee et al, Tetrahedron Letters, No. 20, pp. 1641-1644, (1976).
Anita O. Sy and Joseph W. Raksis, Tetrahedron Letters, vol. 21, pp. 2223-2226, (1980).

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