Structural constraints on electrocyclic reactions of unsaturated ketenes. Synthesis and irradiation of 2,4,4,5-tetramethylbicyclo[4.2.0]octa-1,5-dien-3-one
Structural constraints on electrocyclic reactions of unsaturated ketenes. Synthesis and irradiation of 2,4,4,5-tetramethylbicyclo[4.2.0]octa-1,5-dien-3-one