Cyclo-heptene, C 7 H 121 is obtained by the action of alcoholic potash on suberyl iodide; and from cyclo-heptane carboxylic acid, the amide of which by the action of sodium hypobromite is converted into cyclo-heptanamine, which, in its turn, is destructively methylated (R.
Cyclo-heptadiene 1.3, C7Hio, is obtained from cyclo-heptene (Willstatter, loc. cit.).
Cyclo-heptane carboxylic acid (suberanic acid), C7H13C02H, is obtained by the reduction of cyclo-heptene-I-carboxylic acid; from brom-cyclo-heptane by the Grignard reaction; and by the reduction of hydrotropilidine carboxylic acid by sodium in alcoholic solution (R.
Four cyclo-heptene carboxylic acids are known.
Cyclo-heptene-i- carboxylic acid-i is prepared from oxysuberanic acid.
This acid when heated with concentrated hydrochloric acid to 120-130° C. yields a chlor-acid, which on warming with alcoholic potash is transformed into the cyclo-heptene compound.
Cyclo-heptene-2-carboxylic acid-1 is formed by the reduction of cyclo-heptatriene 2.4.