Process for the preparation of aromatic carbamates and isocyanat

Details Process for the preparation of aromatic carbamates and isocyanat Process for the preparation of aromatic carbamates and isocyanat

1982-01-28

1983-11-15

Torrence, Dolph H.

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

Organic compounds

Carboxylic acid esters

260453P, C07C12506, C07C11800

Patent

active

044157452

ABSTRACT:
Production of aromatic polyisocyanates is achieved by a multireaction process comprising sequentially; the ammoxidation of a methylated aromatic, e.g. toluene; hydrolysis of the aromatic nitrile; conversion of the resultant amide to a carbamate; condensation with aldehyde; decomposition of the condensation product; and, recovery of the aromatic polyisocyanate.

REFERENCES:
patent: 2860166 (1956-11-01), Newcamer et al.
patent: 3029245 (1962-04-01), Aries
patent: 3462476 (1969-08-01), O'Donnell et al.
patent: 4202986 (1980-05-01), Shawl
Altankirk et al., J. Org. Chem. 27, 4532 (1962).

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