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Generalized iodolactonization conditions have been developed for the formation of both cis‐ and trans‐γ‐lactones from 3‐pentenoic acid derivatives containing various protected alcohol moieties. Kinetic control of the reaction using iodine and base at 0 °C for 6 h provided the cis‐lactone with good selectivity (75:25), and thermodynamic control at room temperature for 24 h provided the trans‐lactone...
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