Carbonyl compounds, methods of making the same, and their use as fragrances and fragrance-enhancing additives

Judging by demand, many natural perfumes are available in totally inadequate quantities. For example, 5,000 kg of rose blossoms are required to produce 1 kg of rose oil. The consequences are a seriously limited annual world production and a high price. Accordingly, it is clear that the perfume industry has a constant need for new perfumes with interesting notes in order to add to the range of naturally available perfumes, to make the necessary adaptations to changing fashion trends and to be able to cover the constantly increasing demand for improvements in the odor of products of everyday use, such as cosmetics and cleaners. Carbonyl compounds derived from the reaction of alkyl cyclopentenols and vinyl ethers are described. The carbonyl compounds described have excellent fragrance properties, and their use as fragrances and/or fragrance-enhancing compounds is also described. Processes for the preparation of the carbonyl compounds are described as well.