Scheme 9 White and Jayasinghe synthesis of integerrinecic acid lactone
Scheme 10 Hiyama et al. synthesis of β-hydroxy δ-lactones
Scheme 11 Saigo et al. synthesis of 4,5-substituted δ-lactones
OTBS
Scheme 12 Synthesis of δ-lactones from azetidinones
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K. Palanichamy and K.P. Kaliappan