By SIR IAN HEILBROK, ERH JOSES, and F. SONDHEIMER.-4 variety of reactions of pentenynol, illustrated in the accompanying diagram, has been studied. These include partial hydrogenation, carboxylation, hydration to methylfuran, condensation with formaldehyde to the C, glycol, oxidative coupling to the C,, glycol, and oxidation to the corresponding carboxylic acid with chromic acid. Light-absorption data for the diacetylene ...