Add time:09/24/2019         Source:sciencedirect.com

Five new alkylated benzoquinones were isolated as methyl ether derivatives from a complex mixture containing alkylated hydroxy benzoquinones, obtained from the fruits of Maesa lanceolata. The structures of the benzoquinones, named, 2-acetoxy-5-methoxy-6-methyl-3-tridecyl-1, 4-benzoquinone, 2-methoxy-5-acetoxy-6-methyl-3-tridecyl-1, 4-benzoquinone, 2-acetoxy-5-methoxy-6-methyl-3- [ (z)-10′-pentadecenyl]-1,4-benzoquinone, 2-methoxy-5-acetoxy-6-methyl-3- [ (z)-10′-pentadecenyl-1, 4-benzoquinone and 2,5-di- methoxy-6-methyl-3-tridecyl-1,4-benzoquinone, were based on 1 H and 13 C NMR data, mainly 2D NMR experiments, including 1 H–13 C HMBC correlations, as well as chemical derivatization.

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