Ambrosia

Gotter-baum, m. tree of heaven (Ailantkua glanduloaua). -fabel, -lehre, /. mythology, -speise, /. ambrosia, -trank, m. nectar. 

Fpobtem Suggest a synthesis of optically active S-(+)-sulcatol (13), the aggregation pheromone of the wood-boring ambrosia beetle, from available ethyl (S)-(-)-lactate (14). 

The next examples concern species of Ambrosia L. that are characterized, in the first, by a north-south variation, and in the second, an east-west one, with the added feature of different ploidy levels. The work is that of Seaman and Mabry (1979a, b). In the first example, we will look at A. ambrosioides (Cav.) Payne sampled from southern... 

Fig. 2.59 Compounds 193-198 from Helianthus maximiliani 199-201 from Ambrosia ambrosioi-des 202-205 from Ambrosia camphorata...

Table 2.19 Distribution of sesquiterpene lactones in Ambrosia ambrosioides (from Seaman and Mabry, 1979b)...

Table 2.20 Sesquiterpenes, chromosome numbers, and flower head features for Ambrosia camphorata (after Seaman and Mabry, 1979a)...

Fig. 3.5 Compounds 273-275, terpenes from Thuja plicata. Compounds 276 and 277, sesquiterpenes from Ambrosia psilostachya...

Fig. 3.6 Map of Texas coast and adjacent Mexican sites from Ambrosia psilostachys (Ap) study. Populations of Ambrosia cumanensis are represted by Ac. ...

Fig. 7.2 Compounds 581-589, acetylene derivatives from Ambrosia chamissonis...

Balza, E. and Towers, G. H. N. 1990. Dithiacyclohexadiene chlorohydrins and related sulphur-containing polyynes from Ambrosia chamissonis. Phytochemistry 29 2901-2904. 

Sesquiterpene lactones from the genus Ambrosia. Phytochemistry 10 2241-2244. 

Nakatani, N., Bohnstedt, C. and Mabry, T. J. 1973. The origin of Ambrosia chamissonis in Chile. Biochem. Syst. 1 129-132. 

The reaction in Entry 5 was used in the syntheses of linetin, which is an aggregation pheromone of the ambrosia beetle. In Entry 6, a transannular 5-exo cyclization occurs. Entry 7 is an example of formation of a lactone by carboxylate capture. In this case, the product was isolated as the mercurochloride. 

Plantaginaceae, and Compositae. Ragweed (Ambrosia spp.) is the most important single allergenic plant on the North American continent and affects more of our citizens than does smog. Hay fever and similar allergies from weed pollen cause tremendous... 

In a search for allelopathic agents from common weeds, Amaranthus palmerl S. Wats (Palmer amaranth) and Ambrosia artemisiifolia L. (Louisiana annual ragweed) have been analysed for their organic natural products. From A. palmerl phytol, chondrlllasterol, vanillin, 3-methoxy-4-hydroxynitrobenzene and 2,6-dimethoxy- benzoquinone were isolated. From the roots of Ambrosia artemisiifolia four polyacetylenes, a mixture of sesquiterpene hydrocarbons, methyl caffeate, and a mixture of 8-sitosterol and stlgmasterol were obtained. 

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