Diastereomere Alkene als Modelle für die ¹³C‐NMR‐Spektroskopie von Polymeren

Trans ‐3,4,7,8‐tetramethyl‐5‐decene is a low molecular weight model of poly‐2,5‐(2,4‐hexadiene). Eight resonance signals can be observed in the 13 C NMR spectrum of the carbon double bond which are assigned to the relative configurations of the asymmetric carbon atoms. The configurational splitting can be described partially by additive constitutional and configurational shift parameters, which have been determined from a number of alkenes with up to four asymmetric carbon atoms. However, full additivity is not reached as the conformation of the substituents of the carbon double bond influences the shift differences due to the relative configurations of the asymmetric carbon atoms.