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- W2998797438 abstract "Abstract Trigonostemons G and H, two novel dimeric dinorditerpenoids, were isolated from the stem barks of Trigonostemon chinensis. Their planar structures and relative configurations were established by extensive analysis of spectroscopic data. Trigonostemons G and H possess a homodimeric biaryl skeleton obtained from two rearranged chiral nonracemic abietane‐type dinorditerpenes through an axially chiral biaryl 11,11′‐linkage. Torsional scan and computation of the transition states were carried out to estimate the rotational energy barrier, and the axial chirality (a S ) was determined by time‐dependent density functional theory (TDDFT) electronic circular dichroism (ECD) calculations. The positive n‐π* ECD transitions of the isolated carbonyl chromophore above 300 nm could be used to determine the central chirality of trigonostemon G independently by ECD calculations of the diastereomers." @default.
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- W2998797438 date "2020-01-13" @default.
- W2998797438 modified "2023-10-15" @default.
- W2998797438 title "Trigonostemons G and H, dinorditerpenoid dimers with axially chiral biaryl linkage from <i>Trigonostemon chinensis</i>" @default.
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- W2998797438 doi "https://doi.org/10.1002/chir.23170" @default.
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