Process for the preparation of mono- and oligourethanes
AssigneeBayer Aktiengesellschaft
InventorsHelmut Reiff, Dieter Dieterich
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Abstract
This invention relates to a process for the preparation of N,N-disubstituted mono- and oligourethanes by the reaction of N-aromatically, N-aliphatically, N-cycloaliphatically, and N-araliphatically substituted mono- and oligourethanes with dialkyl carbonates in the presence of at least stoichiometrically equivalent quantities of solid alkali or alkaline-earth carbonate in excess dialkyl carbonate and/or an aprotic organic solvent and in the presence of a phase transfer catalyst.
Claims12
A process for preparing an N,N-disubstituted mono- or oligourethane comprising reacting
- (a) an n-aromatically, n-aliphatically, N-cycloaliphatically, or n-araliphatically substituted mono- or oligourethane
- (b) with a dialkyl carbonate in the presence of
- (c) at least stoichiometrically equivalent quantities of a solid alkali or alkaline earth carbonate in excess dialkyl carbonate, an aprotic organic solvent, or a mixture thereof, and in the presence of a phase transfer catalyst.
A process for preparing a N,N-disubstituted mono- or oligourethane comprising reacting
- (a) an N-aromatically, N-aliphatically, N-cycloaliphatically, or N-araliphatically substituted mono- or oligourethane
- (b) with dimethyl carbonate in the presence of
- (c) at least stoichiometrically equivalent quantities of dry powdered potassium carbonate in excess dimethyl carbonate or in dimethyl sulfoxide, dimethylformamide, N-methylpyrrolidone, or tetramethylene sulfone and in the presence of a tetraalkylammonium chloride, bromide, or iodide.
Dependencies are inferred from the claim text.