Preparation of carbamates from organic carbonates and aromatic u

Details Preparation of carbamates from organic carbonates and aromatic u Preparation of carbamates from organic carbonates and aromatic u

1984-08-08

1986-01-28

Helfin, Bernard

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

Organic compounds

Carboxylic acid esters

560 25, C07C125065, C07C125073

Patent

active

045672873

ABSTRACT:
Disclosed is an improved process for the preparation of carbamates by heating an organic carbonate and an aromatic urea or polyurea in the presence of aluminum as catalyst and a promoter comprising a combination of iodine and a mercury salt.
High reaction temperatures are avoided by the process and conversions to carbamate products are high. Additionally, the process is economically attractive because even the common aluminum foil can be used as the catalyst.
The products prepared by the process can be used in the production of insecticides, and, particularly, as intermediates in the preparation of organic mono- and polyisocyanates.

REFERENCES:
patent: 3627813 (1971-12-01), Abbate et al.
patent: 3763217 (1973-10-01), Brill
patent: 4100351 (1978-07-01), Romano et al.
patent: 4381404 (1983-04-01), Buysch et al.

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