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US 7,247,753 B2Granted
Method for producing macrocyclic ketones by means of dieckmann codensation in the gas phase
AssigneeBASF SE
InventorsAlexander Wartini, Klaus Ebel, Gisela Hieber, Hagen Weigl
Life of this patent
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Abstract
The invention relates to a method for producing macrocyclic ketones of general formula (I) by direct cyclisation of compounds of general formula (II) in the gas phase on a heterogeneous catalyst. In general formula (I), X represents a monounsaturated or polyunsaturated or saturated C10–C17 alkyl radical which can be optionally substituted by a C1–C6 alkyl radical, and in general formula (II), R1, R2 can respectively be the same or different and represent hydrogen or C1–C6 alkyl, and has the above-mentioned designation.
Claims18
A process for the preparation of macrocyclic ketones of the formula I
- where
- X is a mono- or polyunsaturated or saturated C10–C17-alkyl radical which may optionally be substituted by a C1–C6-alkyl radical,
- said process comprising direct cyclization of a compound of the formula II
- where
- R1, R2, in each case independently of the other, may be identical or different and are hydrogen or C1–C6-alkyl and X has the meaning given above, and wherein said cyclization takes place in the gas phase over a heterogeneous catalysts comprising, as active components, oxides, hydroxides or carboxylates of subgroups I to VIII, or of main groups II, III and IV, wherein the compound of formula (II) is evaporated and then passed at a desired reaction temperature in gaseous form over the catalyst arranged in a fixed bed.
2 more elements
Dependencies are inferred from the claim text.