Acetylenverbindungen im Pflanzenreich.

Biogenesis and Biological Activity of Polyacetylenes

“…In the light of EIMHJELLEN'S results, BOHLMANN (1957) In 1959 it was shown (WAKIL and GANGULY) that biogenesis of fatty acids proceeds through coupling of malonyl CoA units (formed from acetyl CoA) and subsequent decarboxylation. JONES (1961) suggested that the immediate precursor of an acetylene might be an enol ester of an acyl malonyl CoA derivative; the triple bond would arise by simultaneous elimination of CO 2 and a group such as a pyrophosphate ion.…”

“…They are certainly not at all the sort of compounds one would expect to find in living material, much less "lurking in every bush". Several reviews on natural polyacetylenes (WAILES, 1956;BOHLMANN, 1955BOHLMANN, , 1957SORENSEN, , 1963 mention that SEMMLER 'S (1906, 1909) choice of an allenic structure rather than the (correct) acetylenic one for carlina oxide (II) was influenced by his reluctance to accept the occurrence of the acetylenic bond in nature. He reasoned, "Es ist von Hause aus sehr unwahrscheinlich, daB ein acetylenartige Verbindung vorliegt" (SEMM-LER, 1906).…”

Chemotaxonomy of the Family Compositae (Asteraceae)

“…Several schools have studied in detail the content of polyacetylenic compounds, furanoid compounds and their thiophene derivatives in the Compositae for reviews of this subject, see Soerensen (1962), BuLock (1966), and especially Bohlmann and Mannhardt (1957). In 1967 more than one thousand species were investigated (Bohlmann, 1967) all of them containing several different types of acetylenic compounds, especially those with 10, 13 and 14 to 18 carbon atoms in the molecule.…”