Described are synthetically produced substantially pure enol ether compositions which are cis and/or trans isomers of enol ethers having the structures: ##STR00001## wherein R.sub.1 is C.sub.4 C.sub.10 straight chain alkyl or C.sub.9 8-alkenyl; and wherein R.sub.2 is C.sub.1 C.sub.4 alkyl, C.sub.3 C.sub.4 2-alkenyl, C.sub.4 3-alkenyl or C.sub.10 non-allenic alkadienyl and uses thereof in imparting, augmenting or enhancing the aroma and/or taste of a consumable material such as a perfume composition, a cologne, a perfumed article such as a soap, cosmetic, hair preparation or detergent, a foodstuff, a chewing gum or an alcoholic or non-alcoholic beverage such as a carbonated beverage or fruit liquer. Also described is a process for synthesis of such enol ethers by means of (i) first forming an acetal having the structure: R.sub.1--CH.sub.2--CH(OR.sub.2).sub.2 (ii) then carrying out a thermal decomposition reaction at pH<7 and then (iii) fractionally distilling the resulting reaction product to provide the enol ether.