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note
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Formation of the kinetic product, trans-spirane 6aa as the major isomer in ionic liquids, as opposed to the cis-spirane 5aa through the endo-transition state in the classical Diels-Alder route is likely explained by unique solvation in the ionic liquid of the 2-amino-1,3-butadiene 9a and dienophile 8a in the transition states shown below. Asymmetric solvation in the ionic liquids may produce a steric hindrance with the phenyl group on the dienophile, in the endotransition state, thereby disfavoring it (Figure 1). equation presented
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