Hanna H. Cramer, Matthew V. Pecoraro, Paul J. Chirik. "Pyridine(diimine) Chromium η,<sup>1</sup>η<sup>3</sup>-Metallacycles as Precatalysts for Alkene-Diene [2 + 2] Cycloaddition." Journal of the American Chemical Society, 2025. doi:10.1021/jacs.5c01182