Preparation of urethane and carbonate products
AssigneeMonsanto Company
InventorsWilliam D. McGhee, Dennis P. Riley
Life of this patent
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Abstract
The present invention provides a process for preparing urethanes and carbonates from an amine or an alcohol, carbon dioxide and a hydrocarbyl halide. The amine or alcohol is reacted with carbon dioxide in a suitable solvent system and in the presence of an amidine or guanidine base, to form the ammonium carbamate or carbonate salt which is then reacted in a polar aprotic solvent with a hydrocarbyl halide. Polymer products can also be prepared utilizing this process or utilizing the resulting urethanes and carbonates under standard polymerization conditions.
Claims12
A process for preparing carbonates comprising:
- (a) bringing CO.sub.2 and an alcohol into reactive contact in the presence of a strongly basic nitrogenous compound selected from amidine and guanidine bases to form the corresponding carbonate salt, and
- (b) reacting, in a polar aprotic solvent, said salt with a primary or secondary hydrocarbyl halide.
A process for preparing carbonates of the formula:
- ##STR12## wherein R.sub.1 represents primary or secondary radicals selected from the group consisting of alkyl, alkenyl, cycloalkyl, cycloalkenyl, aralkyl and aralkenyl radicals having 1 to about 22 carbon atoms and R.sub.4 represent alkyl, alkenyl, cycloalkyl, cycloalkenyl, aralkyl, aralkenyl, alkenaryl and alkarly radicals having 1 to about 22 carbon atoms, or R.sub.4 is represented by the formula:
- ##STR13## wherein R.sub.5 represents alkylene radicals having 1 to about 22 carbon atoms, and n is an integer from 0 to about 8, comprising:
- (a) bringing CO.sub.2 and an alcohol into reactive contact in the presence of a strongly basic nitrogenous compound selected from amidine and guanidine bases to form the corresponding carbonate salt, and
- (b) reacting, in a polar aprotic solvent, said salt with a primary or secondary hydrocarbyl halide.
Dependencies are inferred from the claim text.