Described is a genus of E2,E4,Z8-undecatrienoic acid derivatives defined according to the structure: ##STR00001## wherein Z represents --OR'' or --NRR' with the provisos that when Z is --OR'', R'' is hydrogen, C.sub.1 C.sub.6 straight chain or branched-chain alkyl or C.sub.3 C.sub.6 straight chain or branched-chain alkenyl; and when Z is --NRR', R represents, in the alternative, hydrogen, methyl or ethyl and R' represents methyl, ethyl, n-propyl, cyclopropyl, isopropyl, n-butyl, sec-butyl, isobutyl, 2-methylbutyl, cyclobutyl, ##STR00002## cyclopentyl or allyl. The E2,E4,Z8-undecatrienoic acid derivatives are useful in imparting, augmenting and/or enhancing flavors, aromas and somatosensory effects in or to consumable materials such as foods, beverages, skin care products, oral care products, medicinal products and the like. Also described is a synthesis process for producing such derivatives.