2-Methyl-4-(2,2,3-trimethylcyclopent-3-en-1-yl)pent-4-en-1-ol

4-penten-1-ol,2-methyl-4-(2,2,3-trimethyl-3-cyclopenten-1-yl)- is a colorless liquid with a very powerful and natural sandalwood note. The material can be prepared starting from -campholenealdehyde: Condensation with formaldehyde and subsequent reduction lead to 2-(2,2,3-trimethyl-3- cyclopenten-1-yl)-2-propenol, which is reacted with an alkyl ortho-propanoate to yield an alkyl 2-methyl-4-(2,2,3-trimethyl-3-cyclopenten-1-yl)-4-pentenoate. Reduction of the latter gives the fragrance material. It can be used to impart a powerful and tenacious natural sandalwood note to a wide range of perfume types.