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A short synthesis of the title compound 13 is reported. The acetal group in 13 enables one to control the regio‐ and stereoselectivity of the two successive Diels‐Alder additions of the tetraene. The first addition is significantly faster than the second one, thus making 13 a versatile reagent for regio‐ and stereoselective ‘tandem’ cycloadditions.
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Métral et al. (1985) studied this question.
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