Method of producing a cyclohexenone oxime ether lithium...

Organic compounds -- part of the class 532-570 series – Organic compounds – Heterocyclic carbon compounds containing a hetero ring...

Reexamination Certificate

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Reexamination Certificate

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06989453

ABSTRACT:
A process for preparing 2-{1-[2-(4-chlorophenoxy)propoxyimino]-butyl}-3-hydroxy-5-(tetrahydrothiopyran-3-yl)cyclohex-2-enone lithium salt by reacting the corresponding acid 2-{1-[2-(4-chlorophenoxy)-propoxyimino]butyl}-3-hydroxy-5-(tetrahydrothiopyran-3-yl)-cyclohex-2-enone and lithium hydroxide and the isolation of the lithium salt are described. Here, it is advantageous to use a solvent mixture which comprises methanol and at least one aromatic hydrocarbon and to remove at least some of the solvent prior to the isolation. It is particularly preferred to dissolve the acid in an aromatic hydrocarbon, preferably toluene, and to use a methanolic lithium hydroxide solution.The product, which can be obtained in a more efficient manner by this process, furthermore has considerable advantages with respect to formulation.

REFERENCES:
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patent: 6133202 (2000-10-01), Bratz et al.
patent: 6294504 (2001-09-01), Tobler et al.
patent: 6316390 (2001-11-01), Nakamura et al.
patent: 6383987 (2002-05-01), von der Heyde et al.
patent: 6576596 (2003-06-01), Hill et al.
patent: 6599861 (2003-07-01), Schaetzer et al.

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