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The secondary alcohols 3, 4 and 10 have been converted into the corresponding lactones using Acinetobacter calcoaceticus NCIMB 9871: the transformations (endo-4)⇒6+11 and 10⇒8+9 can be conducted in vitro using a coupled enzyme system (Thermoanaerobium brockii dehydrogenase and Acinetobacter calcoaceticus monooxygenase) with in situ recycling of NADPH/NADP+.
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Willetts et al. (1991) studied this question.
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