Synthesis of PET-active fluorinated nanoparticles. Blacklines of polymer backbone. Purple lines are pendant PEG groups. Red lines are cinnamoyl groups. Blue and green spheres are mesylate groups and fluorine atoms, respectively. (A) Ru-3 mediated sequential ROMP. (B) i) Dialysis against H2O. (ii) hv, 3 min. (iii) 1. K18F, kryptofix-222, K2CO3, BHT, MeCN, 120°C, 60 min. 2. K19F, kryptofix-222, MeCN, 80°C, 30 min.