Mixtures of 3-(4-methylcyclohex-3-enyl)butyraldehyde and Ambrocenide® and corresponding uses and methods

1. A mixture comprising 3-(4-methylcyclohex-3-enyl)butyraldehyde (limonenal) and (4aR,5R,7aS,9R)-octahydro-2,2,5,8,8,9a-hexamethyl-4H-4a,9-methanoazuleno(5,6-d)-1,3-dioxole, wherein the weight ratio of limonenal to (4aR,5R,7aS,9R)-octahydro-2,2,5,8,8,9a-hexamethyl-4H-4a,9-methanoazuleno(5,6-d)-1,3-dioxole is in the range from 150:1 to 2500:1.

2. The mixture of claim 1 consisting essentially of 3-(4-methylcyclohex-3-enyl)-butyraldehyde (limonenal) and (4aR,5R7aS,9R)-octahydro-2,2,5,8,8,9a-hexamethyl-4H-4a,3-methanoazuleno(5,6-d)-1,3-dioxole, wherein the weight ratio of limonenal to (4aR,5R,7aS,9R)-octahydro-2,2,5,8,8,9a-hexamethyl-4H-4a,9-methanoazuleno(5,6-d)-1,3-dioxole is in the range from 150:1 to 2500:1.

3. The mixture of claim 1 consisting of 3-(4-methylcyclohex-3-enyl)butyraldehyde (limonenal) and (4aR,5R,7aS,9R)-octahydro-2,2,5,8,8,9a-hexamethyl-4H-4a,9-methanoazuleno(5,6-d)-1,3-dioxole, wherein the weight ratio of limonenal to (4aR,5R,7aS,9R)-octahydro-2,2,5,8,8,9a-hexamethyl-4H-4a,9-methanoazuleno(5,6-d)-1,3-dioxole is in the range from 150:1 to 2500:1.

4. The mixture of claim 1 , wherein the weight ratio of limonenal to (4aR,5R,7aS,9R)-octahydro-2,2,5,8,8,9a-hexamethyl-4H-4a,9-methanoazuleno(5,6-d)-1,3-dioxole is in the range from 600:1 to 2500:1.

5. The mixture of claim 1 , wherein the weight ratio of limonenal to (4aR,5R,7aS,9R)-octahydro-2,2,5,8,8,9a-hexamethyl-4H-4a,9-methanoazuleno(5,6-d)-1,3-dioxole is in the range from 800:1 to 2500:1.

6. The mixture of claim 2 , wherein the weight ratio of limonenal to (4aR,5R,7aS,9R)-octahydro-2,2,5,8,8,9a-hexamethyl-4H-4a,9-methanoazuleno(5,6-d)-1,3-dioxole is in the range from 800:1 to 2500:1.

7. The mixture according to claim 1 , further comprising one or more diluents or solvents selected from the group consisting of ethanol, dipropylene glycol (DPG), propylene glycol, 1,2-butylene glycol, glycerol, diethylene glycol monoethyl ether, diethyl phthalate (DEP), isopropyl myristate (IPM), triethyl citrate (TEC), benzyl benzoate (BB) and benzyl acetate.

8. The mixture of claim 7 , wherein the weight ratio of (4aR,5R,7aS,9R)-octahydro-2,2,5,8,8,9a-hexamethyl-4H-4a,9-methanoazuleno(5,6-d)-1,3-dioxole to the total amount of said diluent(s) or solvent(s) is in the range from 1:99 to 1:1.

9. A fragrance mixture comprising the mixture of claim 1 , and further comprising at least an equal proportion by weight of one or more other fragrances.

10. A method of masking the fatty olfactory note of limonenal comprising: mixing limonenal with an amount of (4aR,5R,7aS,9R)-octahydro-2,2,5,8,8,9a-hexamethyl-4H-4a,9-methanoazuleno(5,6-d)-1,3-dioxole the partially or completely masks the fatty olfactory note of limonenal, wherein the weight ratio of limonenal to (4aR,5R,7aS,9R)-octahydro-2,2,5,8,8,9a-hexamethyl-4H-4a,9-methanoazuleno(5,6-d)-1,3-dioxole in the mixture is in the range from 150:1 to 2500:1.

11. The method of claim 10 , wherein the weight ratio of limonenal to (4aR,5R,7aS,9R)-octahydro-2,2,5,8,8,9a-hexamethyl-4H-4a,9-methanoazuleno(5,6-d)-1,3-dioxole in the mixture is in the range from 600:1 to 2500:1.

12. A method of preparing a fragrance composition comprising the steps of mixing together 3-(4-methylcyclohex-3-enyl)butyraldehyde (limonenal); (4aR,5R,7aS,9R)-octahydro-2,2,5,8,8,9a-hexamethyl-4H-4a,9-methanoazuleno(5,6-d)-1,3-dioxole (4aR,5R,7aS,9R)-octahydro-2,2,5,8,8,9a-hexamethyl-4H-4a,9-methanoazuleno(5,6-d)-1,3-dioxole, and one or more other fragrances, wherein the weight ratio of limonenal to (4aR,5R,7aS,9R)-octahydro-2,2,5,8,8,9a-hexamethyl-4H-4a,9-methanoazuleno(5,6-d)-1,3-dioxole is in the range from 150:1 to 2500:1.

13. The method of claim 12 , wherein the fragrance composition has a fresh, citrus-like note.