• Lepidine and similar compounds can be alkylated at the 2-position by free radicals generated by the action of t-butyl hydroperoxide and a salt of Fe(II) on a primary or secondary alkyl iodide: Acta Chem. Scand., 43, 995 (1989). Similarly, 2-formylation can be achieved in high yield using 1,3,5-trioxane in the presence of TFA, t-BuOOH and FeSO4 in acetonitrile: J. Org. Chem., 51, 536 (1986).