Frantz Kaufmann

Chemical constituents of the genus Dahlia—III: A chemotaxonomic evaluation of some Dahlia coccinea strains

Abstract An examination of five strains of Dahlia coccinea for polyacetylenes reveals a close chemical similarity between the five morphological types, especially in the tubers. Some differences were found in the aerial parts.

Polyacetylenic C14-epoxide and C14-tetrahydropyranyl compounds from Dahlia scapigera☆

Abstract A new polyacetylenic epoxide (1-acetoxy-4,5-epoxy-tetradeca-6,12-diene-8,10-diyne) has been isolated together with tetrahydro-2-(non-1,7-diene-3,5-diynyl)pyran-3-ol from Dahlia scapigera (A. Dieter) Link et Otto var. scapigera forma merckii . The two compounds are assumed to be biogenetically related. The content of polyacetylenes in the species is summarized.

Polyacetylenes of Dahlia pinnata

Abstract Dahlia pinnata Cav. was examined for polyacetylenes. The resulting data have been compared to those for six strains of D. coccinea Cav. and some differences were established. Compounds with an ene-diynediene chromophore are abundantly represented in D. pinnata , whereas at most traces of compounds with this chromophore were detected in D. coccinea .