CH2 CH  = CH CH2 -- CH =CH CH2•CH2CH ,a -'des-methyl cyclo-octadiene granatanine Cyclo-octadiene, CSH12, as above prepared, is a strong-smelling oil which decolorizes potassium permanganate solution instantaneously . It readily polymerizes to a di-cyclo-octadiene and polymer (C8H12~„ (R . Willstatter, Ber., 1905, 38, pp . 1975, 1984; G . Ciamician and P . Silber, Ber., 1893, 26, p . 2750; A . Piccinini, Gaza., 1902, 32, I p . 260). i3-cyclo-octadiene has been prepared from methyl granatinine iodmethylate . Cyclo-octane, C3H18 is obtained by the reduction of the above unsaturated hydrocarbon by the Sabatier and Senderens's method . It is a liquid which boils at 146.3-148° C. and possesses a strong camphor odour . On oxidation it yields suberic acid (R .

Willstatter, Ber., 1907, 40, pp . 957) . O . Doebner (

Bee., 1902, 35, pp . 2129, 2538; 1903, 36, p . 4318) obtained compounds, which in all probability are cyclo-octadienes, by the distillation of p-vinylacrylic acid, sorbic .acid, and cinnamenyl acrylic acid with anhydrous baryta . Cyclo-nonane Group . According to N . Zelinsky (Bee., 1907, 40, p . 780) cyclononanone, C9H16O, a liquid boiling at 95-97° C., is formed on distilling sebacic acid with lime, and from this, by reduction to the corresponding secondary alcohol, conversion of the latter into the iodide, and subsequent reduction of this with zinc, cyclo-nonane, C,H18, a liquid boiling at 170-172° C. is obtained .