Preparation method of carboxylic acids or ketones using ozone, singlet state-oxygen atom or hydroxyl free radical
AssigneeNational Tsing Hua University
InventorKuo-Chu HWANG
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Abstract
A preparation method of carboxylic acids or ketones using ozone, singlet state oxygen atom O(1D) or hydroxyl free radical is provided. The method includes: filling ozone, singlet state oxygen atom O(1D) and/or hydroxyl free radical to cycloalkanes or benzenes at a pre-determined temperature and a pre-determined pressure in the presence or absence of light irradiation to produce carboxylic acids or ketones. The reaction occurs at room temperature and atmospheric pressure without producing harmful side products. The preparation method is a simple, low energy consuming, and eco-friendly method.
Claims13
A method for preparation of ketones, comprising steps of:
- filling at least one of following three oxidants, comprising ozone, a singlet state-oxygen atom O(1D), and a hydroxyl free radical, to cycloalkanes at a pre-determined temperature and a pre-determined pressure without using transition metal catalysts or bromide catalysts and without using nitric acid or acetic acid as a solvent to produce cycloketones;
- wherein the pre-determined temperature is in a range between −10° C. and 50° C., and the pre-determined pressure is in a range between 0.8 atm and 1.2 atm;
- wherein the cycloalkanes comprise cyclopentane, cyclohexane, cycloheptane, cyclooctane or a combination thereof;
- the cycloketones comprise cyclopentanone, cyclohexanone, cycloheptanone, cyclooctanone or a combination thereof.
A method for preparation of aromatic ketones, comprising steps of:
- filling at least one of following three oxidants, comprising ozone, a singlet state-oxygen atom O(1D), and a hydroxyl free radical to alkylbenzenes at a pre-determined temperature and a pre-determined pressure without using transition metal catalysts or bromide catalysts and without using nitric acid or acetic acid as a solvent to produce aromatic ketones, wherein an alkyl group of the alkylbenzenes comprises two or more carbon atoms;
- wherein the alkylbenzenes comprise ethyl benzene or diphenylmethane;
- and the aromatic ketones comprise acetophenone or benzophenone.
A method for preparation of aromatic carboxylic acids, comprising steps of:
- filling at least one of following three oxidants, comprising ozone, a singlet state-oxygen atom O(1D), and a hydroxyl free radical to benzenes at a pre-determined temperature and a pre-determined pressure without using transition metal catalysts or bromide catalysts and without using nitric acid or acetic acid as a solvent to produce aromatic carboxylic acids, wherein the number of carbon atoms of each substituent of the benzenes is 1;
- wherein the benzenes comprise toluene, p-xylene, o-xylene, m-xylene, p-toluic acid, 4-carboxybenzaldehyde or a combination thereof;
- and the aromatic carboxylic acids comprise benzoic acid, terephthalic acid, phthalic acid, isophthalic acid or a combination thereof.
Dependencies are inferred from the claim text.