New and Known Polyacetylenes from Nature

New and Known Polyacetylenes from Nature.— In investigations of numerous members of the tribe Inuleae (Compositae), the pentaynene (1) has been found to be particularly widespread. Osmites hirsuta, however, was found to contain the isovaleric esters (2a) and (2b). The pentaynene (1) has also been 

The acetylene (5), which has been reported previously in Seseli hippomara-thrum, has also been found in Eryngium bourgatti (Umbelliferae).  

The roots of the S. African species Artemisia afra have been examined by Bohlmann and Zdero, and shown to contain the known acetylenes (8), (10), (II), (12), and (13). This study established that Artemisia afra is chemically related to the European Artemisia species, but among sixty species of Artemisia previously examined, the acetylenes (8) and (10)— (13) have never before been found together. The roots of Artemisia 

Several other South African plants have been examined for polyacetylenic compounds. Three species of the S. African genus Chrysocoma were shown to contain the new polyenynes (14)—(17), each containing the unusual 

A total of foxuteen new thiophen-acetylenic compounds have been isolated from various species of the S. African tribe Arctotideae of the genus Berkheya, and structures (21)—(24) have been proposed for the compounds. Bohlmann 

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