Hydroxy-terminated PIB

In the H-NMR spectrum of hydroxyl-terminated PIB (Structure HI) the eight peak pattern in the 3.22-3.48 ppm range is clearly due to the AB part of a typical ABX system. This splitting pattern is most likely due to prochirality the two protons (gj and g2) in the - CH2OH group are magnetically non-equivalent, as they are part of a prochiral - CH2- group  

Monnatt and co-workers [53] observed H-NMR signals for olefinic end groups - CH2C(CH3) = CH2, CH = C(Me)2, and - CH2C- (CH2) CH2- in high molecular weight PIB. 

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