Iron-Catalyzed Cross-[2 + 2] Cycloaddition of Butadiene and α,ω-Dienes for Ductile and Chemically Recyclable Poly(oligocyclobutanes) - Cherish Nie; Sahana V. Sundar; Hang Zhang; Richard A. Register; Michael A. Webb; Rodney D. Priestley; Emily C. Davidson; Paul J. Chirik (Journal of the American Chemical Society, 2026)