Structure of Longifolene.

Abstract

Naffa and Ourisson proposed a structure of longifolene from the investigation of its X-ray, infrared, and Raman spectra, and from chemical reactions of five-membered ring having a double bond. For the purpose of chemical certification of five- and seven-membered rings in the molecule, other than those verified by Naffa and others, examination was made on dehydrogenation of α-longifolic acid and a monobasic acid which was obtained from longicamphenylone by decomposition. 4, 8-Dimethylazulene was obtained from α-longifolic acid in this experiment confirming the structural formula suggested by Naffa and Ourisson.