Preparation of isocyanates using a silver salt promoted rearrang

Details Preparation of isocyanates using a silver salt promoted rearrang Preparation of isocyanates using a silver salt promoted rearrang

1991-04-01

1992-11-10

Dees, Jose G.

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

Organic compounds

Isocyanate esters

560157, 560162, 560163, 560330, 560355, 560358, C07C26312

Patent

active

051625750

ABSTRACT:
The present invention relates to a process for producing isocyanates which comprises reacting an N-halogenated amide with an organic base in an essentially water-free modified Hofmann reaction using a soluble silver salt promoter in the presence of an organic solvent. Also disclosed is a process for producing a carbamate which comprises reacting an N-halogenated amide with an organic base in an essentially water-free modified Hofmann reaction using a soluble silver salt promoter in the presence of an alcohol solvent.

REFERENCES:
patent: 2640846 (1953-06-01), Hurwitz et al.
patent: 4238404 (1980-12-01), Zeagel et al.
patent: 4282167 (1981-08-01), Sy et al.
patent: 4683329 (1987-07-01), Rao

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