Sentence Examples

  • Oak tannin; whilst others yield protocatechuic acid and phloroglucin, e.g.
  • Moringa-tannin or maclurin, C1,H1006 H20, found in Morus tinctoria, hydrolyses on fusion with caustic potash to phloroglucin and protocatechuic acid.
  • Alkali fusion of eugenol gives protocatechuic acid.
  • The latter when heated with hydrochloric acid to 170°, or water to 200°, separates carbon with the formation of protocatechuic acid, I.
  • Conversely, by heating protocatechuic acid with potash and methylene iodide, piperonylic acid was regained.

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