A compound of formula (I): wherein R is -CH2OH, -C(O)H5 -C(OR3)2H, -C(OR4)(OH)H, -CH=NC6H4C(O)OR5 or -CH=NR6; R1 and R2 are each independently H or CH3; R3 and R4 are each independently H or a straight or branched aliphatic group having from 1 to 12 carbon atoms, or each R3 is covalently linked to the other R3 to form a cyclic acetal having from 1 to 4 carbon atoms; R5 is H or a straight or branched aliphatic group, or a cyclic, heterocyclic or aromatic group having from 1 to 12 carbon atoms; and R6 has at least 10 carbon atoms and is an aliphatic group or an aromatic group. Mixtures of these compounds, methods for their preparation, their use as perfume materials for application to a variety of substrates and their use in flavouring and in articles of manufacture is also provided.