Topic and overall goal: In a joint project, both research groups succeeded in 2011 in synthesizing the first phosphorus-based singlet biradical and demonstrated its great potential in activating small molecules [...] by in situ NMR (under incorporated light switching), UV spectroscopy and structural analysis that the biradical (generated by reaction with isonitriles) forms a transannular bond and a closed-shell housane [...] thermally reacts back. This molecular switching has been applied to switch chemical reactions on and off. The Beweries group has many years of experience in activating small molecules using low valent, cyclic
https://www.spectre.uni-rostock.de/phd-projects/p33/