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One of the color substances, taiwanin A, was isolated from Taiwania ( Taiwania cryptomerioides  Hayata) heartwood. According to the  13 C-NMR,  1 H-NMR, HSQC, HMBC, and NOE difference spectroscopy analyses, the diene structure of taiwanin A was reconfirmed to be the  trans-trans  formulation. In addition, it was proven that deep orange crystalline taiwanin A changed to white and pale yellow compounds, taiwanin C and taiwanin E, after light irradiation. The conversion mechanism of taiwanin A into taiwanin C and taiwanin E is also proposed and discussed in this study.

holzforschung

Chemical Constituents and Mechanisms of Discoloration of Taiwania (Taiwania cryptomerioides Hayata) Heartwood. The Structure Reconfirmation and Conversion Mechanism of Taiwanin A