Known Polyacetylenic Compounds from Terrestrial Plants

3 Known Polyacetylenic Compounds from Terrestrial Plants.- A large number of new sources of known polyacetylenic compounds have been reported, mainly by Bohlmann and co-workers, often as an offshoot of their studies on the Compositae terpenes. These new sources are recorded in Table 1, along with the major compound types isolated from them. Known compounds which were isolated along with the compounds described in the previous section are not included in the table. 

A useful method of visualising polyacetylenes on TLC plates has been described. Vanillin and p-dimethylaminobenzaldehyde were found to be the best reagents for locating a large variety of polyacetylenes. The combination of and the colour produced by the two spray reagents allowed twenty-five acetylenic compounds 

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New Polyacetylenic Compounds from Terrestrial Plants.- The majority of new compounds have been isolated from members of the large Compositae family, and many are reported as a result of Bohlmann s continuing study of this family. Most are closely related to known structural types and their structures therefore follow easily from spectral data. The growing use of high resolution n.m.r. for this purpose is apparent. Unless otherwise indicated the species mentioned belong to the Compositae. 

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