Method for preparing aromatic urethans

Details Method for preparing aromatic urethans Method for preparing aromatic urethans

1977-03-24

1978-07-11

Thomas, Jr., James O.

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

Organic compounds

Carboxylic acid esters

560 25, 560 27, 560 28, C07C12506

Patent

active

041003519

ABSTRACT:
In the preparation of aromatic urethans, a dialkyl carbonate is reacted with an N-acyl derivative of an amine: thus, for example, by reacting acetanilide with a lower dialkyl carbonate, such as DMC or DEC, in the presence of titanium tetraphenate (Lewis' acid), phenylmethyl urethan is obtained with a yield over 90%. No toxic reactants are used and the reaction has outstandingly high yields and conversion ratings. The urethane in question are useful as weed-killers and pesticides in agriculture.

REFERENCES:
patent: 3763217 (1974-10-01), Brill
patent: 3819683 (1974-06-01), Krebs et al.
patent: 3938986 (1976-02-01), Pray
patent: 4021469 (1977-05-01), Weston
Illuminati et al., "Chem. Absts.", 105287m, vol. 84, 1976.

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