.alpha.-Ethyl-.beta.-N-propylacrolein .alpha.-Ethyl-.beta.-propylacrolein 2-Ethyl-2-hexen-1-al 2-Ethyl-2-hexenal 2-Ethyl-2-hexenol 2-Ethyl-3-propylacrolein 2-Ethylhexenal 2-Hexenal,