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US 7,683,161 B2Granted
Selective reduction of spinosyn factors Et-J and Et-L to spinetoram
AssigneeDow AgroSciences LLC
InventorsDavid E. Podhorez, Gary A. Roth, David C. Molzahn, Timothy Adaway
Life of this patent
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Abstract
Spinetoram is selectively produced in excellent yields by hydrogenating a mixture of 3′-O-ethyl spinosyn J and 3′-O-ethyl spinosyn L in a water miscible organic solvent using hydrogen gas and a heterogeneous catalyst.
Claims3
A process for producing spinetoram which comprises:
- hydrogenating a mixture comprising about 50-90% by weight of 3′-O-ethyl spinosyn J and about 50-10% by weight of 3′-O-ethyl spinosyn L, in a water miscible organic solvent, with hydrogen gas at a pressure between 2 and 3000 psig, in the presence of a heterogeneous catalyst capable of selectively reducing the 5,6-double bond of 3′-O-ethyl spinosyn J, until the 3′-O-ethyl spinosyn J is converted to 3′-O-ethyl-5,6-dihydro-spinosyn J.
Dependencies are inferred from the claim text.