Studies Related to Naturally Occurring Acetylene Compounds. XXIX. Preliminary Investigations in the Genus Bidens: I. Bidens radiata Thuill and Bidens ferulaefolia (Jacq.) DC..

Abstract

A preliminary investigation of B. radiata and B. ferulaefolia revealed the occurrence of a number of the poly-acetylenes previously isolated from several members of the genus Coreopsis. The diene-tetrayne I was found both in the nonpolar form I,R = H, and as a polar derivative supposed to be L R = OCOCH3 Further the trideca-l,3,5,ll-tetraene-7,9-diyne II could be isolated in crystalline form. The presence of 1-phenylhepta 1,3,5-triyne could be demonstrated only spectroscopically. B. radiata furnished 2 fractions containing substances with broad adsorption bands in the ultraviolet. One of them could be obtained pure, and preliminary constitutional work indicated the structure = 5- methyl- 5[image]-buta-l,3-dienyl-2,2[image]-dithienyl.