ChemInform Abstract: Thermal Intramolecular [2 + 2] Cycloaddition: Synthesis of 3‐Azabicyclo[3.1.1]heptanes from Morita—Baylis—Hillman Adduct‐Derived 4, 4‐Diaryl‐1, 3‐dienes. Issue 16 (April 2015)