Patent ID: 11884639
Assignee: SHANDONG JINGBO AGROCHEMICALS TECHNOLOGY CO., LTD.
Field: Organic fine chemistry (Chemistry)
Classification: CPC C  B  Y | IPC B  C

Claim 4:
5. The preparation method for the high optical indoxacarb intermediate (2S)-5-chloro-2,3-dihydro-2-hydroxy-1-oxo-1H-indene-2-carboxylic acid methyl ester according to claim 1, wherein a weight of the water added in step (2) is 2-4 times of the weight of the condensate; extraction with ethyl acetate, and a weight of ethyl acetate added is 6-10 times of the weight of the condensate; the crystallization solvent is methanol; a dosage of methanol is 4-8 times of the weight of the condensate.