Relative and Absolute Configuration

With a knowledge of the structures of the necines and necic acids and with the location of ester linkages ascertained, it is possible to write structural formulas to represent the pyrrolizidine alkaloids. Configurations (absolute and relative) at asymmetric carbons and double bonds are indicated when the author feels that these have been established with a reasonable degree of certainty. Structures have not been provided where the information is deemed insufficient, so that not all of the alkaloids listed in Table 1 will be given representations. The alkaloids are divided into three main categories monoesters, diesters (two different necic acids), and cyclic diesters. The amine iV -oxides are not given since their structures are obvious from the amines. 

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See also in sourсe #XX -- [ , , ]

See also in sourсe #XX -- [ , , , ]

See also in sourсe #XX -- [ ]

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