Probing the Hidden Photoisomerization of a Symmetric Phosphaalkene Switch. - Deka, Rajesh; Steen, Jorn D.; Hilbers, Michiel F.; Roeterdink, Wim G.; Iagatti, Alessandro; Xiong, Ruisheng; Buma, Wybren Jan; Di Donato, Mariangela; Orthaber, Andreas; Crespi, Stefano (Angewandte Chemie, 2025)