Polymer Chemistry Nonmetallic photoinitiators of polymerization are gaining interest for biomedical and electronics applications in which metal compounds are toxic or their presence reduces performance. Messina et al. report on boron clusters [B12(OR)12, where R is a phenyl or pentafluorophenyl group] that act as photoinitiators with blue light for the polymerization of olefins. These compounds photoionize and can initiate the reaction via one-electron transfer (creating a cluster radical anion and a monomer radical cation) to both electron-rich and electron-deficient styrene monomers at very low loadings (0.005 mol %). Even monomers such as isobutylene yielded highly branched polymers when the highly electron-withdrawing fluorinated initiator was used. J. Am. Chem. Soc. 10.1021/jacs.6b03568 (2016).