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The stereochemistry of the exocyclic double bond in 4a was found to be E by comparison of its spectral and analytical data with those of the compound prepared from the reaction of la with methyl 4-iodobenzoate ac- cording to a procedure reported by us earlier
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The stereochemistry of the exocyclic double bond in 4a was found to be E by comparison of its spectral and analytical data with those of the compound prepared from the reaction of la with methyl 4-iodobenzoate ac- cording to a procedure reported by us earlier: G. Fournet, G. Balme, I Goré, Tetrahedron 1991, 47, 6293.
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