13C Assignment of Diastereotopic C-26 and -27 Methyl Groups of 24-Methylenecholesterol: Steric Course of Hydrogen Migration from C-24 to C-25 during Its Biosynthesis in Higher Plants.

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  • 13C Assignment of Diastereotopic C-26 a

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Chemical shifts of the diastereotopic methyl groups (C-26 and C-27) of 24-methylenecholesterol have been unambiguously assigned by synthesizing stereochemically defined 13C-labeled compounds. This allowed us to establish the steric course of hydrogen migration from C-24 to C-25 during the formation of 24-methylenecholesterol from a Δ24-precursor in a tissue culture of Catharanthus roseus.

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