The analytical data of 2a-d and 4a-c are shown in Table IV (supplementary material).Quantum Yield Determination. A solution containing lb or 2b (20-26 mM) in acetonitrile was irradiated with a low-pressure mercury lamp (60 W) under an argon atmosphere through a Coming 9-54 color filter at 20-21 °C. After irradiation, the solvent was evaporated under vacuum and methanol was added to the oily residue. The formed or unreacted Dewar 4-pyrimidinone 2b was converted to the 8-lactam 5.5" Analyses of lb and 5 were performed by HPLC with hexane-CHgC^-CHgCN (92:5:3) as the
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.