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US 2015/0031919 A1Published application
Process for the preparation of substituted phenylpropanones
AssigneeSyngenta Participations AG
InventorsDaniel Stierli, Harald Walter
Life of this patent
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Abstract
The invention relates to a process for the preparation of a compound of formula (I) wherein the substituents are defined as in claim 1, which process comprises adding a compound of formula (II), wherein R1, R2 and R3 have the meanings as described under formula (I), in the presence of an inert organic solvent, to a mixture comprising an organic nitrite of formula (III) R4—O—N═O, wherein R4 is C1-C8alkyl, a compound of formula (IV), and an inert organic solvent.
Claims5
A process for the preparation of the compound of formula I
- wherein
- R1 is hydrogen, halogen or C1-C6alkyl;
- R2 is hydrogen, halogen, C1-C6alkyl, C2-C6alkenyl, C3-C6alkinyl, C3-C6cycloalkyl-C3-C6alkinyl, halophenoxy, halophenyl-C3-C6alkinyl, C(C1-C4alkyl)═NO—C1-C4alkyl, C1-C6haloalkyl, C1-C6haloalkoxy, C2-C6haloalkenyl, or C2-C6haloalkenyloxy;
- R3 is hydrogen, halogen, C1-C6alkyl;
- which process comprises
- adding a compound of formula II
- wherein R1, R2 and R3 have the meanings as described under formula I, in the presence of an inert organic solvent to a mixture comprising an organic nitrite of formula III
- R4—O—N═O (III),
- wherein R4 is C1-C8alkyl, a compound of formula IV
- and an inert organic solvent.
7 more elements
Dependencies are inferred from the claim text.