Radicals formed by SmI 2 –H 2 O-mediated electron transfer to the carbonyl group of unsaturated five-membered lactones undergo diastereoselective cyclisation to give cyclohexane-1,4-diols. The use of HMPA as an additive with SmI 2 –H 2 O gave improved conversion and diastereoselectivity in the cyclisations.
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Just‐Baringo et al. (2016) studied this question.
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