Ketene → HCID 131734414, compound

In a preferred embodiment of the invention, the yield of the 4-chloroacetoaceticacid ester, 4-chloroacetoaceticacid amide or 4-chloroacetoaceticacid imide is at least 90%, based on the total amount of ketene provided in step (a). More preferably, the yield is above 92% or above 95%. Preferably, the yield of 4-chloroacetoacetate chloride obtained in the first reaction step is more than 90%, preferably more than 95% or more than 98%. Preferably, the conversion of chlorine is at least 95%, more preferably at least 98% or at least 99.5%.

ORD record

ord-4e076a0f3c6f4e338eb3d6368cd53185

Source dataset

uspto-grants-2016_01

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US09227905B2