The present invention provides a compound having one of the following formulae: ##STR00001## R and R.sub.1 are each independently H or C.sub.1-5 alkyl provided that in formula (I) when R is methyl, R.sub.1 is H or C.sub.2-5 alkyl. R.sub.2 has from 1 to about 12 carbon atoms and is a straight or branched aliphatic group, or a cyclic, heterocyclic or aromatic group. R.sub.3 and R.sub.4 are each independently H or CH.sub.3. Mixtures of these compounds, methods for their preparation, their use as perfume materials for application to a variety of substrates and their use in flavoring and in articles of manufacture is also provided.