Beilstein J. Org. Chem.2013,9, 925–933, doi:10.3762/bjoc.9.106
entropy effect were found to play crucial roles in increasing the lifetime.
Keywords: laser flash photolysis; lifetime; singlet diradicals (biradicals); substituent effect; π-singlebond; Introduction
Localized singlet diradicals are key intermediates in processes involving the homolytic bond-cleavage