Slowly add the lithium alkyl (prepared in step 2) to the phosphite-electrophile mixture (from step 3) while maintaining low temperatures. This addition should be carried out dropwise and with continuous stirring. The reaction will result in the formation of the α-oxophosphonate monolithium salt.
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Acetic acid, (2,4-dichlorophenoxy)-, (dimethoxyphosphinyl)methyl ester
