Fragrance compounds

This invention concerns novel fragrance compounds, and perfumes and perfumed products comprising the novel compounds. Novel compounds having the structure (I) where Ris a lower alkyl group, R, R, Rand Ris each independently hydrogen or a lower alkyl group, Ris hydrogen, a lower alkyl group, an alkylidene group or a lower alkenyl group and Ris hydrogen or a lower alkyl group, have desirable odor properties, possibly of a blackcurrant, green, buchu, cassis nature, and find use in perfumes and perfumed products.