Preparation of dialkyl (N-cyanoimido)carbonates from dialkyl imi

Details Preparation of dialkyl (N-cyanoimido)carbonates from dialkyl imi Preparation of dialkyl (N-cyanoimido)carbonates from dialkyl imi

1992-01-21

1993-08-17

Higel, Floyd D.

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

Organic compounds

Imidate esters

558 6, C07C27168, C07C26100, C07C26900, C07C26906

Patent

active

052370844

ABSTRACT:
Dialkyl (N-cyanoimido) carbonates are prepared in good yield in a non-aqueous solvent by a process which comprises either (a) adding a cyanogen halide at a controlled rate to a reactor containing an unsubstituted or substituted dialkyl imidocarbonate, an inorganic base and/or a trialkyl amine, or (b) by adding a trialkyl amine to a solution of the unsubstituted or substituted dialkyl imidocarbonate and a cyanogen halide. The dialkyl imidocarbonate precursors are prepared by using a stoichiometric ratio (2:1) of alcohol to cyanogen halide in the presence of an acid acceptor and in a non-aqueous solvent.
Dialkyl (N-cyanoimido)carbonates are useful as intermediates for pesticides and pharmaceuticals.

REFERENCES:
patent: 2708189 (1955-05-01), Nelb et al.
patent: 2819292 (1958-01-01), Welcher et al.
patent: 3225077 (1965-12-01), Schaefer et al.
patent: 4298544 (1981-11-01), Robinson

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