The structure of the alkali fusion product derived from maesopsin. The evidence based on mass spectrometry and N.M.R. spectroscopy

Abstract

Maesopsin, C₁₅H₁₂O₆, (obtained from the heartwood of Maesopsis eminii, Rhamnaceae) on fusion with alkali forms a yellow product, C₁₅H₁₀O₅, which on methylation forms two methyl ethers. Structures for these products are suggested from a consideration of their N.M.R. and mass spectra, which afford confirmation of the original work.