Abstract: A method is described for the preparation of a trimethylcyclohexyl-alkan-3-ol containing a proportion of trans isomer of Formula D where R=H, Me, Et, n-propyl, iso-propyl, n-butyl, iso-butyl or tert-butyl and R1=Me, Et, n-propyl, iso-propyl, n-butyl, iso-butyl or tert-butyl, or of a mixture of several such trimethylcyclohexyl-alkan-3-ols, wherein the method comprises catalytically hydrogenating corresponding compound(s) of Formula B in which R and R1 in each case have the indicated meanings, in the presence of a nickel catalyst, preferably of Raney nickel, and in an absence of catalytically active amounts of copper chromite.

Abstract: A method is described for the preparation of a trimethylcyclohexyl-alkan-3-ol containing a proportion of trans isomer of Formula D 1

Abstract: It was found that 8-exo-formyl-2,6-exo-tricyclo[5.2.1.0.sup.2,6 ]decane having the constitution and stereochemistry of formula (I) possesses particularly useful olfactory properties which are clearly superior to those of the 8-endo-epimer and which already have an effect if compound (I) is enriched with mixtures of 8-exo- and 8-endo-epimers. Compound (I) can therefore be advantageously used, in pure or enriched form, as a scent or as a component of perfume compositions. To prepare an enriched epimer mixture, a mixture obtained in a known manner (U.S. Pat. No. 3,270,061) and having an exo/endo ratio of 1.45:1 is brought into equilibrium by base catalysis, preferably by the action of alkali hydroxides in alcoholic solution, to give an exo/endo ratio of 5.25:1. Alternatively, the enriched epimer mixture can be prepared starting from 8-formyl-2,6-exo-tricyclo[5.2.1.0.sup.2,6 ]decene-3(4), catalytically hydrogenated for example with palladium coal and then optionally brought into equilibrium.

Abstract: Mixtures of new dimethyl-tricyclo[5.2.1.0.sup.2,6 ]decane derivatives, notably the primary isomers of the common formula A, whereinR.sup.1 and R.sup.2 mean either methyl group or hydrogen, one of the substituents being a methyl group and the other hydrogen,R.sup.3 and R.sup.4 mean either methyl group or hydrogen, one of the substituents being a methyl group and the other hydrogen, andX indicates the .pi.-system of a C-C double bond or an epoxide system, can advantageously be used as new acent- and flavor materials.The compounds of the common formula A, were prepared by hydrogenation of dimeric methylcyclopentadiene selectively in the norbornane part and when desired by epoxidation of the remaining double bond.

Abstract: The invention concerns1. Mixtures of tricyclo[5.2.1.0.sup.2,6 ]decane derivatives, having principal isomers corresponding to the general formula A, whereinR.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, andthe broken lines indicate a C--C-single bond and a C--C-double bond or alternatively two C--C-single bonds. ##STR1## 2.

Abstract: C-8-substituted 1,5-dimethyl-bicyclo[3.2.1]octane-8-ols having the general formula I ##STR1## wherein R is a lower open chained or cyclic alkyl- alkenyl- or alkinyl group having up to 6 carbon atoms and the wavy line at the C-8 atom means epimeric forms, the process for producing these compounds and their use as odorants and constituents of parfume composition for cosmetic and industrial parfuming or essential oils and flavoring agents.

Abstract: Synthetic oakmoss extracts of alkyl-substituted .beta.-resorcylic acid esters useful as perfume ingredients, are prepared by refluxing alkyl-substituted dihydro-.beta.-resorcylic acid esters with sulphuric acid and acetic anhydride, followed by saponifying the resultant diacetate.