cis-Mutatochromes

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1) All-trans mutatochrome, C40H56O, undergoes rearrangement to give cis isomers which can be resolved by column chromatography. 2) Five cis compounds were isolated, of which three are mono-cis isomers, termed neo-U, -A, and -B. 3) Quantitative study of the stereoisomeric mutatochrome was made and all-trans mutatochrome was found to be more stable to thermal, photochemical, and catalytic treatments than all-trans luteochrome. 4) Some related spectroscopic phenomena were discussed and tentative configurational assignments of (II), (III), and (IV) were respectively proposed for neo-U, -A, and -B.

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