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Abstract

The invention concerns 1. Mixtures of tricyclo[5.2.1.0.sup.2,6 ]decane derivatives, having principal isomers corresponding to the general formula A, wherein R.sup.1 and R.sup.2 are hydrogen atoms or are a methyl group or a hydrogen atom, one of the substituents being a methyl group and the other a hydrogen atom, R.sup.3 and R.sup.4 are hydrogen atoms or are a methyl group or a hydrogen atom, one of the substituents being a methyl group and the other a hydrogen atom, Y is a tetrahydrofurane system at C-4/C-5 or a substituted oxymethyl group at C-5 and a hydrogen atom at C-4, R.sup.5 is a hydrogen atom or a C.sub.1 -C.sub.6 -acyl-, C.sub.1 -C.sub.6 -alkyl-, C.sub.1 -C.sub.6 -alkenyl-, C.sub.1 -C.sub.4 -alkoxymethyl-, C.sub.1 -C.sub.2 alkoxycarbonyl-, formylmethyl-, or di-C.sub.1 -C.sub.4 -alkoxyethyl-group, and the broken lines indicate a C--C-single bond and a C--C-double bond or alternatively two C--C-single bonds. ##STR1## 2. Process for the preparation of these mixtures, wherein dimeric methylcyclopentadiene is selectively hydrogenated in the norbornane part and reacted with formaldehyde, paraformaldehyde or trioxane in the presence of a protonic acid or Lewis acid, optionally saponified or esters, ethers, acetates or oxoaldehydes prepared in known manner, and 3. the use of these mixtures as perfuming- and flavoring materials.

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First Claim