Method of synthesis of tetradentate amide macrocycle ligand and its metal-complex
A tetradendate amide based macrocyclic ligand and its Fe(III) complex which act as activators of hydrogen peroxide. The synthetic methodology to develop the ligands is new, simple and provides better yield for each step of the ligand synthesis. The Fe(III)-complexes and hydrogen peroxide together are can perform several environmentally benign oxidation reactions. Organic dye bleaching, bleaching of pulp and paper effluent and N-oxide synthesis may be performed using the newly developed catalyst and hydrogen peroxide. Alcohol oxidation and alkene epoxidation may also be performed using the catalysts and hydrogen peroxide.
1. A tetradentate amido macrocycle ligand made by a process comprising the steps of:
(a) protecting one of the amine groups of o-phenylenediamine with a tert-butyloxycarbonyl group (BOC);
(b) reacting the product of step (a) with dimethylmalonyl chloride in the presence of triethylamine;
(c) reacting the product of step (b) with triflouroacetic acid to remove the protecting BOC group; and
(d) reacting the product of step (c) with oxalyl chloride in the presence of triethylamine to produce a tetradentate amido macrocycle ligand.
2. A process for synthesizing a tetradentate amido macrocyclic ligand, comprising the steps of:
(a) protecting one of the amine groups of o-phenylenediamine with a tert-butyloxycarbonyl group (BOC);
(b) reacting the product of step (a) with dimethylmalonyl chloride in the presence of triethylamine;
(c) reacting the product of step (b) with triflouroacetic acid to remove the protecting BOC group; and
(d) reacting the product of step (c) with oxalyl chloride in the presence of triethylamine to produce a tetradentate amido macrocycle ligand.
3. A process for synthesizing an iron complex of the tetradentate amido macrocyclic ligand produced by the method of claim 2 , comprising the steps of:
deprotonating the ligand of claim 2 with a strong base, reacting the resulting product with ferrous chloride and exposing the resulting mixture to air.
4. An iron complex of a tetradentate amido macrocycle ligand made by the process of claim 3 .
5. A process of using the iron complex of claim 4 for an activator of hydrogen peroxide for oxidation of a substrate, comprising the step of contacting the substrate with the iron complex of claim 4 and hydrogen peroxide.
6. The process of claim 5 , wherein said substrate comprises pulp and paper effluent.
7. The process of claim 5 , wherein said substrate comprises a dye.
8. The process of claim 5 , wherein said substrate is selected from precursor molecules from which small molecules are synthesized by oxidation.