Transition metal carbene chemistry7: Nucleophilic substitution reactions of imidazolide and benzimidazolide ions with Fischer carbene complexes in MeOH
作者： Supriya Biswas , Mahammad Ali
DOI: 10.1016/J.JORGANCHEM.2007.02.047
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摘要: Abstract Rate constants for the nucleophilic substitution reactions of imidazolide (IZ − ) and benzimidazolide (BIZ ions with 4 - Cr Z 5 in MeOH at 25 °C are reported Hammett ρ values evaluated to be 1.50 ± 0.10 1.51 ± 0.08 -IZ -BIZ reactions, respectively. The comparable reactivity also almost identical these indicate that there is no difference sensitivity towards electronic effects due slightly bigger size BIZ over IZ bond formation transition states equally progressed. higher compared those a wide range nucleophiles may arise mainly lower polarity solvent which enhances requirement stabilization negative charge state by Z-substituents.
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