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US 7,405,328 B2Granted
Method for producing alkenone ethers
AssigneeSolvay Fluor GmbH
InventorsEckhard Hausmann, Oalf Boese, Johannes Eicher
Life of this patent
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Abstract
In a method or producing haloalkenone ethers by addition of a carboxylic acid halide to a vinyl ether and subsequent elimination of hydrogen halide, the improvement comprising carrying out the reaction in the absence of a base and/or in the presence of a stabilizer for the resulting alkenone, whereby higher yields of the desired alkenone product can be obtained.
Claims10
A method for preparing an alkenone, corresponding to Formula (I):
- R1—C(O)—C(H)═C(H)—OR2 (I)
- in which
- R1 represents CF3, and
- R2 represents aryl, substituted aryl, a C1-C4 alkyl group or a C1-C4 alkyl group, which is substituted by at least one halogen atom;
- said method comprising reacting a carboxylic acid halide with a vinyl ether in an addition reaction in a first step, and subsequently eliminating hydrogen halide in a second step to form the alkenone, wherein the reaction is carried out in the absence of an acid-capturing agent for the resulting hydrogen halide, and the second step is carried out at a temperature in the range from 30° C. to 90° C.
- wherein the acid halide corresponds to Formula (II):
- R1—C(O)X (II)
- in which
- X represents fluorine, chlorine or bromine, and
- R1 has the meaning given above,
- and the vinyl ether corresponds to Formula (III):
- CH2═C(H)—OR2 (III)
- in which R2 has the meaning given above.
10 more elements
Dependencies are inferred from the claim text.