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US 6,310,259 B1Granted
Method for producing 6,10 and 6,9-dimethyl-5,10-undecadienyl-2-ones
AssigneeDegussa AG
InventorsWilhelm Keim, Armin Kraus, Rainer Hahn, Klaus Huthmacher
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AssigneeDegussa AG
InventorsWilhelm Keim, Armin Kraus, Rainer Hahn, Klaus Huthmacher
Estimating the term…
The present application refers to a process for preparing 6,10- and 6,9-dimethyl-5,10-undecadienyl-2-ones by telomerizing isoprene with alkyl acetoacetates in the presence of a catalyst system containing a transition metal compound catalyst and a phosphorus- or arsenic-containing compound cocatalyst, wherein the process is performed in the presence of a protic additive of the general formula in which: R1, R2, R3 represent an alkyl group with 1 to 9 carbon atoms, branched or unbranched, a cycloalkyl group with 6 to 8 carbon atoms, an aryl group, in particular phenyl, or an arylalkyl group, X(−) represents an inorganic or organic anion, y is 1 or 2, and the β-ketoester so obtained is saponified and decarboxylated in a manner known per se.
A process for preparing 6,10- and 6,9- dimethyl-5,10-undecadienyl-2-ones by telomerzing isoprene with alkyl acetoacetates in the presence of a catalyst system containing a transition metal compound catalyst and a phosphorus- or arsenic-containing compound cocatalyst, wherein the process is performed in the presence of a protic additive of the general formula
A process for preparing 6,10- and 6,9-dimethyl-5,10-undecadienyl-2-ones by telomerizing isoprene with alkyl acetoacetates in the presence of a catalyst system containing a transition metal compound catalyst and a phosphorus- or an arsenic-containing compound cocatalyst, wherein the process is performed in the presence of an acid or a protic additive of the general formula:
Dependencies are inferred from the claim text.