Cyclopentene derivatives

Abstract

Cyclopentene derivatives (I) ##STR1## where R.sup.1 is isopropyl or isopropenyl, R.sup.2 is alkyl of 1 to 3 carbon atoms, X is --CHO, a dialkyl acetal or 1,2- or 1,3-alkylene acetal thereof where the acetal radical is of 2 to 6 carbon atoms, --CH.sub.2 OH or --CH.sub.2 OCOR.sup.3 where R.sup.3 is hydrogen or alkyl or alkenyl of up to 3 carbon atoms. The manufacture of I from the corresponding halomethyl cyclopentenes and aldehydes R.sup.2 --CH(CH.sub.3)--CHO in the presence of a base and a quaternary ammonium salt, followed if desired by acetalization or conversion of the --CHO group to the --CH.sub.2 OH or --CH.sub.2 O--CO--R.sup.3 groups. The compounds are useful as fragrance materials.

Dependencies are inferred from the claim text.