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The present invention relates to processes for the preparation of compounds of the formula (Ia) by reacting styrene with a secondary alkanol and the hydrogenation of the resulting phenyl-substituted tertiary alkanol. In addition, the invention relates to compounds of the formula (Ia) and to the use

The present invention relates to processes for the preparation of compounds of the formula (Ia) by reacting styrene with a secondary alkanol and the hydrogenation of the resulting phenyl-substituted tertiary alkanol. In addition, the invention relates to compounds of the formula (Ia) and to the use of such compounds as fragrances, and also to compositions which comprise compounds of the formulae (Ia) and (Ib).

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1. A process for the preparation of a composition comprising a compound of formula (Ia) and a compound of formula (Ib) the process comprising: a) reacting styrene with a compound of the formula (II)  to provide a compound of formula (IIIa) and a compound of formula (IIIb)  andb) the heterogeneous

1. A process for the preparation of a composition comprising a compound of formula (Ia) and a compound of formula (Ib) the process comprising: a) reacting styrene with a compound of the formula (II)  to provide a compound of formula (IIIa) and a compound of formula (IIIb)  andb) the heterogeneous-catalytic hydrogenation of the compounds of the formula (IIIa) and formula (IIIb) to give the compounds of the formula (Ia) and the formula (Ib), where R1 and R2, independently of one another, are selected from C3-7-cycloalkyl-C1-7-alkyl-, C3-7-cycloalkyl-, or C1-7-alkyl-, and R1 and R2 together comprise in total 3 to 11 carbon atoms. 2. The process according to claim 1, wherein R1 and R2, independently of one another, are selected from C1-7-alkyl-, C3-7-cycloalkyl or C4-7-cycloalkylalkyl. 3. The process according to claim 1, wherein the reaction in step a) takes place under conditions under which the compound of the formula (II) is present in a supercritical state. 4. The process according to claim 1, wherein the reaction in step a) takes place at a temperature in the range from 250 to 500° C. and a pressure in the range from 5 to 50 MPa. 5. The process according to claim 1, wherein the molar ratio of the styrene used in step a) to the compound of the formula (II) used in step a) is in the range from 1:5 to 1:200. 6. The process according to claim 1, wherein the catalyst used in step b) comprises at least one active metal selected from the group consisting of palladium, platinum, cobalt, nickel, rhodium, iridium and ruthenium. 7. The process according to claim 6, wherein the catalyst used in step b) comprises ruthenium as active metal. 8. The process according to claim 6, wherein the catalyst used in step b) comprises at least one further active metal of sub-groups IB, VIIB or VIIIB of the Periodic Table (CAS version). 9. The process according to claim 1, wherein step b) is carried out in trickle mode. 10. The process according to claim 1, wherein R1 is methyl and R2 is ethyl. 11. A composition comprising a compound of the formula (Ia) and a compound of the formula (Ib) where R1 and R2, independently of one another, are selected from C3-7-cycloalkyl-C1-7-alkyl-, C3-7-cycloalkyl-, and C1-7-alkyl-,and R1 and R2 together comprise in total 3 to 11 carbon atoms. 12. The composition according to claim 11, wherein R1 and R2, independently of one another, are selected from the group consisting of C1-7-alkyl-, C3-7-cycloalkyl and C4-7-cycloalkylalkyl. 13. The composition according to claim 11, where R1 is methyl and R2 is ethyl. 14. A cosmetic composition comprising a compound of the formula (Ia) and a compound of formula (Ib) where R1 and R2, independently of one another, are selected from C3-7-cycloalkyl-C1-7-alkyl-, C3-7-cycloalkyl-, and C1-7-alkyl-,and R1 and R2 together comprise in total 3 to 11 carbon atoms, wherein the cosmetic composition is formulated as aqueous or alcoholic liquid, oil, spray, foam, mousse, gel, gel spray, cream, lotion, tabs or wax. 15. The cosmetic composition, textile detergent or cleaner for hard surfaces according to claim 14, wherein R1 is methyl and R2 is ethyl.