Gi. Borodkin et al., Interaction in olefin-NO+ complexes: structure and dynamics of the NO+-2,3-dimethyl-2-butene complex, MENDELEEV C, (2), 1999, pp. 83-85
H-1 and C-13 NMR studies involving the C-13 NMR deuterium perturbation meth
od and ab initio calculations showed the interaction between 2,3-dimethyl-2
-butene and the nitrosonium cation to form a dynamic pi-complex.