Process for preparing alicyclic carboxylic acid compounds
View Patent ↗A process for preparing at least one alicyclic carboxylic acid compound by Grignard reaction, the process comprising: reacting magnesium and at least one alicyclic halide compound in at least one solvent to produce at least one alicyclic Grignard reagent; concurrently adding carbon dioxide to the magnesium, the alicyclic halide compound, the solvent, and the alicyclic Grignard reagent, while the alicyclic Grignard reagent is still being produced, to form at least one alicyclic carboxylate magnesium salt; and hydrolyzing the alicyclic carboxylate magnesium salt to form the alicyclic carboxylic acid compound; wherein the alicyclic Grignard reagent and the alicyclic carboxylate magnesium salt are prepared in a one-pot synthesis.
1. A process for preparing at least one alicyclic carboxylic acid compound by Grignard reaction, the process comprising:
reacting magnesium and at least one alicyclic halide compound in at least one solvent to produce at least one alicyclic Grignard reagent;
concurrently adding carbon dioxide to the magnesium, the alicyclic halide compound, the solvent, and the alicyclic Grignard reagent, while the alicyclic Grignard reagent is still being produced, to form at least one alicyclic carboxylate magnesium salt; and
hydrolyzing the alicyclic carboxylate magnesium salt to form the alicyclic carboxylic acid compound;
wherein the alicyclic Grignard reagent and the alicyclic carboxylate magnesium salt are prepared in a one-pot synthesis.
2. The process of claim 1 , wherein the alicyclic carboxylic acid compound is at least one p-menthane derivative.
3. The process of claim 2 , wherein the p-menthane derivative is p-menthane-3-carboxylic acid.
4. The process of claim 1 , wherein the alicyclic halide compound is at least one p-menthane halide.
5. The process of claim 4 , wherein the p-menthane halide is selected from the group consisting of p-menth-3-yl chloride, p-menth-3-yl bromide, p-menth-3-yl iodide, and mixtures thereof.
6. The process of claim 1 , wherein the carbon dioxide is concurrently added at a rate of about 0.05 to about 0.8 moles/hour.
7. The process of claim 6 , wherein the carbon dioxide is concurrently added at a rate of about 0.1 to 0.5 moles/hour.
8. The process of claim 1 , wherein the process yields at least 50% by wt. conversion of the alicyclic halide compound to the alicyclic carboxylic acid compound.
9. The process of claim 1 , wherein the process yields at least 75% by wt. conversion of the alicyclic halide compound to the alicyclic carboxylic acid compound.
10. The process of claim 1 , wherein the alicyclic halide compound is added to the magnesium and the solvent at a rate of about 0.1 to 0.5 moles/hour.
11. The process of claim 1 , wherein the alicyclic Grignard reagent and the alicyclic carboxylate magnesium salt are prepared at a temperature of at least 75° C.
12. The process of claim 1 , wherein the alicyclic Grignard reagent and the alicyclic carboxylate magnesium salt are prepared at a temperature of at least 90° C.
13. The process of claim 1 , wherein the solvent comprises a boiling point of at least 65° C. at 1 atmosphere.
14. The process of claim 1 , wherein the solvent comprises a boiling point of at least 150° C. at 1 atmosphere.
15. The process of claim 1 , wherein the process further comprises adding at least one entrainment reagent to the magnesium and the solvent prior to adding the alicyclic halide compound.
16. The process of claim 15 , wherein the entrainment reagent is 1,2-dibromo ethane.