Exploring the maximum Fukui function sites with the frontier-controlled soft-soft reactions using 1,3-dipolar cycloaddition reactions of nitrilium betaines.

According to P.K. Chattaraj. J Phys Chem A 2001, 105, 511-513 "the maximum Fukui function site is the best for the frontier-controlled soft-soft reactions whereas for the charge-controlled hard-hard interactions the preferred site is associated with the maximum net charge and not necessarily the minimum Fukui function". Taking into account these outcomes in this research is explored this reactivity scheme using in first case the reaction between fulminic acid with ethylene (reference reaction), after is varying the dipolarophile in the reaction between fulminic acid with acetylene, and finally is varying the dipole in the reaction between formonitrile imine with ethylene. These results allow study parameter such as charge transfer, polarizability, covalent character on bonding, among other; also shown the preference by the sf- / sf+ interactions in the transition state on the sf- / sf- interactions. On the other hand, these results also were justified using net electrophilicity which is defined as the electrophilic power of a system relative to its own nucleophilic power.