- Preparation method of methomyl
-
The invention discloses a preparation method of methomyl. Methylthio acetaldoxime is used as a raw material and reacts with methyl isocyanate in water under the action of a phase transfer catalyst, the temperature is raised to 50-60 DEG C after the reaction is finished, cooling crystallization and filtration are performed after the material is completely dissolved, filtrate and a filter cake are obtained, the filtrate is extracted with an organic solvent, desolvation is then carried out, desolventized solids and the filter cake are combined and dried, and a methomyl product is obtained. The preparation method has the advantages of high yield, low cost, simplicity and convenience in operation and the like.
- -
-
Paragraph 0011; 0026-0046
(2020/07/24)
-
- Pyrazole oxime derivatives and compositions
-
A pyrazole oxime derivative represented by the general formula (I) which is useful as an insecticide and fungicide, STR1 wherein the structural elements are defined in the specification, and the method of controlling said pests. The compounds represented by the general formula (I) can be synthesized by the methods disclosed in the specification.
- -
-
-
- Process for the preparation of carbamates of N-hydroxythioimidates
-
An improved process for converting N-hydroxythioimidates to N-(methylcarbamoyloxy)-thioimidates by reaction with methylcarbamoyl chloride at pH above 10 in a two-phase reaction medium: water and a water-immiscible organic solvent.
- -
-
-
