Cyclic thiosulfinates and thiosulfonates from oxidation of the 2-thiacephem ring system. Synthesis of (5R)-penems by stereospecific sulfur dioxide extrusion
Cyclic thiosulfinates and thiosulfonates from oxidation of the 2-thiacephem ring system. Synthesis of (5R)-penems by stereospecific sulfur dioxide extrusion