In the study of the oxidation of saturated hydrocarbons by certain microorganisms, oxidation products involving both ends of the hydrocarbons were required for the elucidation of the path of the oxidation. Work in this study was limited to the oxidation products of dodecane and octadecane and included the preparation o€ 1, ll-dodecadiene (Ia), I, 17-octadecadiene (Ib), 1, 2-epoxy-l l-dodecene (11), 1, 2, 11, 12-diepoxydodecane (IIIa), 1, 2, 17, 18- ...