The present invention relates to a process for preparing 3-methyl-2-butenol (prenol) and 3-methyl-2-butenal (prenal) from 3-methyl-3-butenol (isoprenol), in which 3-methyl-3-butenol is subjected to a catalytic isomerization over a carbon-supported Pd catalyst in the presence of a gas mixture comprising 1% to 15% by volume of oxygen to obtain a first product mixture, and the first product mixture is subjected to an oxidative dehydrogenation over a Pd catalyst comprising SiO.sub.2 and/or Al.sub.2O.sub.3 as support material, or over a carbon-supported Pd/Au catalyst in the presence of a gas mixture comprising 5% to 25% by volume of oxygen.

The present invention relates to a process for preparing 3-methyl-2-butenol (prenol) and 3-methyl-2-butenal (prenal) from 3-methyl-3-butenol (isoprenol), in which 3-methyl-3-butenol is subjected to a catalytic isomerization over a carbon-supported Pd catalyst in the presence of a gas mixture comprising 1% to 15% by volume of oxygen to obtain a first product mixture, and the first product mixture is subjected to an oxidative dehydrogenation over a Pd catalyst comprising SiO.sub.2 and/or Al.sub.2O.sub.3 as support material, or over a carbon-supported Pd/Au catalyst in the presence of a gas mixture comprising 5% to 25% by volume of oxygen.

The present invention relates to a process for preparing 3-methyl-2-butenol (prenol) and 3-methyl-2-butenal (prenal) from 3-methyl-3-butenol (isoprenol), in which 3-methyl-3-butenol is subjected to a catalytic isomerization over a carbon-supported Pd catalyst in the presence of a gas mixture comprising 1% to 15% by volume of oxygen to obtain a first product mixture, and the first product mixture is subjected to an oxidative dehydrogenation over a Pd catalyst comprising SiO.sub.2 and/or Al.sub.2O.sub.3 as support material, or over a carbon-supported Pd/Au catalyst in the presence of a gas mixture comprising 5% to 25% by volume of oxygen.

The present invention relates to a process for preparing a mixture of terpene alcohols comprising limonene-4-ol and terpinene-4-ol from terpinolene epoxide via an isomerization and/or hydrogenation reaction in the presence of a copper catalyst.

The present invention relates to a process for preparing a mixture of terpene alcohols comprising limonene-4-ol and terpinene-4-ol from terpinolene epoxide via an isomerization and/or hydrogenation reaction in the presence of a copper catalyst.

The present invention relates to a process for preparing a mixture of terpene alcohols comprising limonene-4-ol and terpinene-4-ol from terpinolene epoxide via an isomerization and/or hydrogenation reaction in the presence of a copper catalyst.

A method for preparing a tertiary alcohol having a formula (I)

##STR00001##

The method includes reacting cyclododecanone with an acrylate having a formula ROCOCH?CH.sub.2 in a reductive aldol reaction under a metal catalysis. R in the formula (I) is a straight-chain C.sub.1-C.sub.8-alkyl, a branched C.sub.1-C.sub.8-alkyl, a straight-chain alkenyl group, a branched alkenyl group, an unsubstituted phenyl group, or a substituted phenyl group.

A method for preparing a tertiary alcohol having a formula (I)

##STR00001##

The method includes reacting cyclododecanone with an acrylate having a formula ROCOCH?CH.sub.2 in a reductive aldol reaction under a metal catalysis. R in the formula (I) is a straight-chain C.sub.1-C.sub.8-alkyl, a branched C.sub.1-C.sub.8-alkyl, a straight-chain alkenyl group, a branched alkenyl group, an unsubstituted phenyl group, or a substituted phenyl group.

Provided are industrial and economical methods for producing 2,6-dimethyl-1,5-heptadien-3-yl acetate (3), which is, for example, a sex pheromone component of Comstock mealybug, and 2,6-dimethyl-1,5-heptadien-3-ol (2), which is an intermediate of the acetate (3). More specifically, provided are a method for producing 2,6-dimethyl-1,5-heptadien-3-ol comprising a step of subjecting 2-methyl-3-buten-2-yl 2-methyl-2-propenyl ether (1) to a rearrangement reaction in the presence of a base to obtain 2,6-dimethyl-1,5-heptadien-3-ol (2), and a method for producing 2,6-dimethyl-1,5-heptadien-3-yl acetate comprising a step of acetylating the produced 2,6-dimethyl-1,5-heptadien-3-ol (2) to obtain 2,6-dimethyl-1,5-heptadien-3-yl acetate (3). ##STR00001##

Provided are industrial and economical methods for producing 2,6-dimethyl-1,5-heptadien-3-yl acetate (3), which is, for example, a sex pheromone component of Comstock mealybug, and 2,6-dimethyl-1,5-heptadien-3-ol (2), which is an intermediate of the acetate (3). More specifically, provided are a method for producing 2,6-dimethyl-1,5-heptadien-3-ol comprising a step of subjecting 2-methyl-3-buten-2-yl 2-methyl-2-propenyl ether (1) to a rearrangement reaction in the presence of a base to obtain 2,6-dimethyl-1,5-heptadien-3-ol (2), and a method for producing 2,6-dimethyl-1,5-heptadien-3-yl acetate comprising a step of acetylating the produced 2,6-dimethyl-1,5-heptadien-3-ol (2) to obtain 2,6-dimethyl-1,5-heptadien-3-yl acetate (3). ##STR00001##