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The internal rotations around the some within a ylide involving theophylline has been studied using the dynamic 1H NMR spectroscopic technique in different temperatures. The kinetic and activation quantities were calculated. Arrhenius, Eyring and classic methods were applied for isomers. compared for carbon-carbon double, carbon-carbon single bond for Z isomer. The results obtained by classic method was different with data calculated from Arrhenius and Eyring methods while these methods were consistent together.

Investigation of rotations in isomerism forms of a ylide of theophylline: Dynamic 1H NMR study