Abstract: The preparation of bicyclic enol-ethers (I) ##STR1## (where n is from 3 to 12, and R.sup.1, R.sup.2 and R.sup.3 may be H or C.sub.1 --C.sub.4 -alkyl) by free radical adduct formation of CHR.sup.1 =CR.sup.2 --CHR.sup.3 --O--R.sup.4 (III)(where R.sup.4 is tert.-butyl, tetrahydrofuran-2-yl or tetrahydropyran-2-yl) with a cyclic ketone (IV) ##STR2## followed by acid-catalyzed cyclization, and novel compounds II ##STR3## The compounds (I) and (II) are intermediates for the synthesis of musk-like fragrances.

Abstract: The invention concerns new 3-methyl-5-keto-.alpha.,.omega.-alkene-dioic acids of the general formula ##STR1## wherein the double bond is in one of the positions indicated by the broken lines,R.sub.1 and R.sub.2 independently of one another are a hydrogen atom or a C.sub.1 -C.sub.4 -alkyl group,x is an integer from 9 to 11 andy and z independently of one another are 1 or 2, but cannot both be 1;a process for their preparation and their use for the preparation of macrocyclic .beta.-methyl ketones which are valuable fragrances.

Abstract: There is provided a process for preparing a compound of the formula ##STR1## wherein X.sup.1, X.sup.2, X.sup.3, and X.sup.4 are independently selected from the group consisting of fluorine, chlorine, bromine and iodine; n is an integer of from 1 to about 100; a, b, c, and d are each integers of from about 0 to about 4; Z.sup.1 and Z.sup.2 are independently selected from the group consisting of halogen and alkyl of from about 1 to about 15 carbon atoms; R.sup.1 and R.sup.2 are independently selected from the group consisting of alkylene containing from about 1 to about 12 carbon atoms, alkylenyl containing from about 2 to about 12 carbon atoms, cycloalkylene of the formula ##STR2## wherein R.sup.3, R.sup.4 and R.sup.5 are independently selected from the group consisting of alkylene of from about 1 to about 5 carbon atoms, and cycloalkylenyl of the formula ##STR3## and A is selected from the group consisting of R.sup.3 CR.sup.