(E)-Hexahydro-(Z)-4,7a-dimethyl-4-vinylbenzofuran-2(3H)-one is an isomer of Anastrephin (A637310), which is a lactone component found in sex?pheromone blend of male Caribbean and Mexican fruit flies. (E)-Hexahydro-(Z)-4,7a-dimethyl-4-vinylbenzofuran-2(3H)-one is a reagent for the synthesis of prolinol (an intermediate for insect pheromones). (E)-Hexahydro-(Z)-4,7a-dimethyl-4-vinylbenzofuran-2(3H)-one?may find utility in pheromone and insecticide applications.