Complex salt Co<sub>2</sub>Cl<sub>5</sub>(py)<sub>5</sub> (py=pyridine) was obtained by the reaction of CoCl<sub>2</sub>·6H<sub>2</sub>O with Bu<sub>4</sub>NMn
A stereoselective and regiospecific synthesis of procursors(2),(4),(6)and(7)ofprostacyclin analogues from 2,3-epoxylbicyclo[3.2.0]hept-6-one(1)are described.