Patent ID: 6310259
Filing Date: 2001-10-30
Classification: C07C

Abstract:
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 ##STR4##in which:R.sup.1, R.sup.2, R.sup.3 represent an alkyl group with 1 to 9 carbon atoms, branched or unbranched, a cycloalcyl group with 6 to 8 carbon atoms, an aryl group, or an arylalkyl group,X.sup.(-) represents an inorganic or organic anion,y is 1 or 2,and the .beta.-ketoester so obtained is saponified and decarboxylated in a manner known per se.