摘要:
The solvent effect on the ene reactions of diethylazodicarboxylate and triazolindione was determined in 18 and 16 solvents respectively. The first enophile gives a solvent effect that depends on solvent acidity (type a solvent effect), while in the second reaction the significant solvent effect is the result of the nucleophilic character of the solvent (type b solvent effect). These are the same solvent behaviours observed in the analogous Diels-Alder cycloadditions, and evidence of the close parallel between these two pericyclic reactions was produced by determining the effect of inorganic perchlorates on their rates.