ChemInform Abstract: New Reactivity Patterns of the β‐Lactam Ring: Tandem C3‐C4 Bond Breakage‐Rearrangement of 4‐Acyl‐ or 4‐Imino‐3,3‐dimethoxy‐2‐ azetidinones Promoted by SnCl2×2H2O. | Publicación