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Updated: May 5, 2025
Piperine has also been made by the uniting of piperidine and piperic acid, and, as piperidine has already been formed from pyridine, we have here a true synthesis also. Both theobromine and caffeine, its methyl derivative, have been made from xanthine, which itself can be formed from guanine, a constituent of guano.
When boiled with alcoholic potash solution, it takes up a molecule of water and splits apart into piperic acid, C H O , and piperidine, C H N. This latter base has been shown to be a hydrogen addition product of pyridine, C H N. When heated with concentrated sulphuric acid, it is oxidized to pyridine.
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