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500 MHz 1H NMR spectrum of tBuCH2CMe2Cl/iPr2O oxonium ion adduct in the presence of 10 eq of TiCl4 in 50/50 (v/v) CS2/CD2Cl2 at −70 °C. The lines designated with “a–e” relate to fragments of reactive complex with the relevant designations; lines designated with “*” represent excess iPr2O·TiCl4 complex; lines at 1.2 and 1.3 ppm are impurities in CS2. Reprinted with permission from [44]. Copyright (2013) American Chemical Society.
