6,8-dimethylnonan-2-ol

Conditions: temp:100.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 200 g of freshly distilled 6,8-dimethyl-3,5-nonadien-2-one and 2 g of copper chromite are placed in a 1 liter steel autoclave which is provided with a magnetic stirrer (Autoclave Engineers, Inc.). The autoclave is flushed with hydrogen and it is firstly placed under a pressure of 30 bar of hydrogen. The autoclave is now heated rapidly to 100° C. and then slowly within 3 hours to 170° C. The pressure is then adjusted to 50 bar and the temperature is fixed at 200° C. The theoretical amount of hydrogen to be absorbed amounts to 90 liters. The autoclave is held at a pressure of 50 atmospheres and in a temperature range between 180°-200° C. After 5 hours, 7% of unsaturated material is still present in the mixture. The hydrogenation is continued for a further 6 hours in order to reduce the amount of non-hydrogenated product to 0.2%. The resulting crude product is separated from the catalyst by filtration and then distilled. There are obtained 171 g (83%) of chemically pure 2,4-dimethyl-nonan- 8-ol of boiling point 91° C./6 mmHg; nD20 =1.4368. 136 g of this product are designated at being olfactorily good (yield 83% or 65.7% respectively). is provided with a magnetic stirrer (Autoclave Engineers, Inc.) The autoclave is flushed with hydrogen and it is fixed at 200° C The theoretical amount of hydrogen to be absorbed amounts to 90 liters is held at a pressure of 50 atmospheres and in a temperature range between 180°-200° C The hydrogenation is continued for a further 6 hours in order The resulting crude product is separated from the catalyst by filtration distilled

Conditions: temp:170.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 64 g of the foregoing ketone are hydrogenated in a stirring autoclave in the presence of 6 g of copper chromite and under 40 bar hydrogen pressure. The temperature is firstly brought to 140° C. When the hydrogen absorption slows down (after 3 hours), the autoclave is heated to 170° C. and held for 3 hours between 165° C. and 170° C. After cooling down to 25° C., the catalyst is filtered off under suction and the filtrate is distilled. There are obtained 56 g (85.4%) of chemically pure 2,4-dimethyl-nonan-8-ol. is firstly brought to 140° C When the hydrogen absorption slows down (after 3 hours) After cooling down to 25° C. the catalyst is filtered off under suction the filtrate is distilled