Complex for use in stabilizing herbicidal compositions and methods for synthesizing and using
View Patent ↗The present invention is directed to the discovery, isolation, identification and methods of synthesis of a novel chemical complex that can be used to stabilize mixtures of different chemical compounds, and in particular mixtures of different herbicidal compounds.
1. A novel complex comprising:
a. at least one pyrasulfotole anion;
b. at least one triethanolamine having at least one moiety capable of complexing; and
c. at least one calcium cation;
wherein said pyrasulfotole anion, said triethanolamine, and said calcium cation form a complex.
2. The complex of claim 1 , wherein said moiety capable of complexing includes hydrogen bonding between said triethanolamine and said pyrasulfotole anion.
3. The complex of claim 1 wherein said complex comprises two pyrasulfotole anions, a triethanolamine and a calcium cation.
4. The complex of claim 1 wherein said complex comprises two pyrasulfotole, a triethanolamine and two protonated triethanolamine.
5. The complex of claim 1 , wherein said pyrasulfotole anion is capable of transesterification in the presence of an unstable ester in the absence of a weak acid buffer system.
6. The complex of claim 1 wherein the complex is unsymmetrical.
7. The complex of claim 1 wherein the complex is optically active.
8. The complex of claim 1 wherein the complex is a racemic mixture.
9. A novel complex according to claim 1 having the crystal structure of the formula:
10. A herbicidal composition, comprising:
a complex comprising at least one pyrasulfotole anion, at least one triethanolamine having at least one moiety capable of complexing; and at least one calcium cation.
11. The herbicidal composition of claim 10 , wherein said complex comprises two pyrasulfotole anions, a triethanolamine and a calcium cation.
12. The herbicidal composition of claim 11 wherein said complex has the x-ray structure of formula:
13. The herbicidal composition of claim 10 , further comprising: fenoxaprop ethyl or fenoxaprop p-ethyl and at least one selected from the group consisting of bromoxynil, bromoxynil ester, bromoxynil mixed ester, and a safener.
14. The herbicidal composition of claim 13 , wherein said safener is present and is at least one selected from the group consisting of mefenpyr, mefenpyr diethyl, isoxadifen, fenchlorazole, and cloquintocet.
15. The complex of claim 1 wherein said complex is stable in oil-based formulations such as an emulsifiable concentrate formulation and controllably releases said pyrasulfotole upon addition of water to said formulation.
16. A method of controlling plants, including weeds, with a herbicidal composition, comprising: applying the composition of claim 10 to a plant, to seeds or other propagation material of a plant, to a locus of said plant, to a locus where there is no plant but where prevention of the growth of said plant is desired, and combinations thereof.
17. The herbicidal composition of claim 10 , wherein said complex was formed in the herbicidal composition in situ.
18. The herbicidal composition of claim 10 , wherein said complex was added to the herbicidal composition.
19. The herbicidal composition of claim 10 , wherein said bromoxynil mixed ester is present and comprises bromoxynil mixed ester of heptanoate and octanoate.