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US 10,647,667 B2Granted
Method for preparing 3-substituted 2-vinylphenyl sulfonates
AssigneeBayer CropScience AG
InventorsDaniel Gallenkamp, Mark James Ford, Dirk Brohm, Florian Erver
Life of this patent
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Abstract
The present invention relates to a method for preparing 3-substituted 2-vinylphenyl sulfonates.
Claims15
Method for preparing a vinylphenyl sulfonate of formula (I):
- in which R1 is C1-C6-alkyl, phenyl, 4-methylphenyl or benzyl, and
- R2 is halogen or methyl,
- comprising reacting
- (a) a compound of formula (II)
- with an activator in the presence of a base to give a compound of formula (III)
- wherein one or more compounds are used as activators selected from the group consisting of thionyl chloride, phosgene, diphosgene, triphosgene, thiophosgene and chloroformic esters,
- and reacting
- (b) the compound of the formula (III) in the presence of a base with a compound of formula (IV)
- R1—SO2—R3 (IV),
- where R3 is F, Cl, Br or OSO2R1 and R1 is as defined in formula (I),
- to give the vinylphenyl sulfonate of the formula (I).
8 more elements
Compound of formula (V),
- in which R2 is halogen or methyl;
- X is C or S, Y is S or O, and wherein X and Y cannot both be S.
Dependencies are inferred from the claim text.