Preparation method of 2-isopropylthioxanthone

A technology of isopropylthioxanthone and propylthiophenol is applied in the field of preparation of 2-isopropylthioxanthone, and can solve the problems of high energy consumption, low efficiency, and unsuitability for large-scale popularization and use. , to achieve the effect of low energy consumption and high efficiency
CN102174036AActive Publication Date: 2011-09-07江西扬帆新材料有限公司
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
江西扬帆新材料有限公司
Publication Date
2011-09-07

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Abstract

The invention discloses a preparation method of 2-isopropylthioxanthone. The method comprises the following steps: 1) performing diazotization reaction: using anthranilic acid, inorganic acid and sodium nitrite to react in water at 0-5 DEG C for 20-40 minutes and obtain diazonium salt; 2) performing condensation etherification reaction: using inorganic alkali, 4-isopropylthiophenol and the diazonium salt obtained in the step 1) to react in water at 0-70 DEG C for 2-4 hours; then adjusting the pH value to 3 with inorganic acid, filtering to obtain the solid; 3) performing dehydration cyclization reaction: placing the solid obtained in the step 2) in concentrated sulphuric acid of which mass concentration is no less than 97%, to react at 20-25 DEG C for 1-3 hours; and 4) reducing the temperature of the product obtained in the step 3), rinsing, filtering, and adding alkaline solution to layer and obtain 2-isopropylthioxanthone. The 2-isopropylthioxanthone prepared by the method is characterized by high efficiency and low energy consumption.
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Description

technical field

[0001] The invention relates to a preparation method of 2-isopropylthioxanthone. Background technique

[0002] 2-isopropylthioxanthone as shown in formula I is a UV-curable photoinitiator, which is widely used in inks, adhesives, electronic products, automotive coatings and the like.

[0003]

[0004] Formula I

[0005] CN200810025425.2 reported the method of etherifying o-chlorobenzoic acid, 4-isopropylthiophenol and lithium hydroxide in tetralin, and then cyclizing in concentrated sulfuric acid to prepare 2-isopropylthioxanthone ; Tetrahydronaphthalene, Lithium Hydroxide that this method needs are expensive, therefore are not suitable for large-scale popularization and use. CN201010168358.7 replaces lithium hydroxide with sodium hydroxide; however, it requires pressurized and high-temperature reaction, requires high equipment, and has great potential safety hazards. CN201010190953.0 replaces lithium hydroxide with copper powder; but the reaction tempe...

Claims

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