Abstract
Investigation on the replacement of d.m.s.o by Imidazole at a Ferrous phthalocyanine centre have been extended over six-thousand fold range of Imidazole concentration by using the stopped-flow method. The observed rate constant is still directly proportional to Imidazole concentration even at the highest (1.45 M) Imidazole concentrations, so that no experimental support for a limiting SN1 mechanism has been obtained. Reasons are presented to show that such a mechanism is not ruled out, but experimental support must now be sought in other solvent/nucleophile combinations with ferrous phthalocyanine.
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