Analysis of 1H‐NMR spectra of various end‐functionalized polyisobutylenes

Abstract 1H‐NMR spectra of various telechelic (i.e., ∼ CH2C(CH3)2Cl, ∼ CH2C(CH3)CH2, ∼ CHC(CH3)2, and ∼ CH2CH(CH3)CH2OH capped) polyisobutylenes (PIB) have been analyzed. The products were prepared by living carbocationic polymerization followed by end‐group functionalization. Shielding and deshielding effects strongly influence the 1H‐NMR spectra of these products. Inductive effects (chlorine‐ended PIBs), magnetically anisotropic end‐groups (olefin groups and phenyl rings), allylic coupling (olefin end‐groups), chirality (hydroxyl end‐groups), and the interaction of these effects on the 1H‐NMR spectra are discussed. Numerous heretofore unidentified resonances have been assigned and better insight into the detailed structure of end‐functionalized PIBs has been obtained.