Title
| - Organoselenium-induced ring closures. Stereoselective synthesis of cyclic .alpha.,.beta.-unsaturated sulfoxides, sulfones, and sulfides and synthesis of 6,9-sulfoxa-5(E)- and -5(Z)-prostacyclin, 6,9-sulfo-5(E)- and -5(Z)-prostacyclin, 6,9-sulfo-6.alpha.- and -6.beta.-4(E)-isoprostacyclin, and 6,9-thiaprostacyclin
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