Migratory insertion polymerization (MIP) of P FpR [ P Fp = (PPh 2 (CH 2 ) 3 Cp)Fe(CO) 2 , R = (CH 2 ) 4 CHCH 2 or (CH 2 ) 5 CH 3 ] (1) involved competitive MIP ring-closing polymerization and monomer cyclization (MC), producing P( P FpR) macrocycles (2) and P FpR rings (3), respectively. MC, generating 3, occurred at the early stage of MIP, while the growing polymer chains exclusively underwent ring-closing cyclization without producing any linear analogues. The effect of solvent, temperature, and the concentration of 1 on the competition between the ringclosing MIP and MC was investigated. 3 was synthesized as the only product in THF with a low concentration of 1 (1 wt %), while the ring-closing MIP predominated under the condition at 60 °C with a high concentration of 1 in THF (>70 wt %), resulting in 2 with M n up to 17 500 g/mol. This effective synthesis of ring molecules is attributed to the piano-stool coordination geometry and the low rotation barrier of Cp−Fe bond and will facilitate further exploration of ring molecules as functional materials and supramolecular building blocks.
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.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.