Preparation method of 2-isopropylthioxanthone

A technology of isopropylthioxanthone and cumene, which is applied in the field of photoinitiator preparation, achieves the effects of less waste, convenient post-processing, and high conversion rate
CN102863422AInactive Publication Date: 2013-01-09浙江凯普化工有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
浙江凯普化工有限公司
Publication Date
2013-01-09
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a preparation method of 2-isopropylthioxanthone. The method comprises the following steps of: reacting benzoic acid serving as a raw material with cumene and sulfur by taking a solid super-acid as a catalyst at the temperature of 80-150 DEG C; after complete reaction, cooling a reaction liquid to the room temperature, and adding toluene for extracting; filtering; recovering a filter cake serving as a solid super-acid catalyst for reuse; washing a filtrate with a saturated saline solution, and drying with absolute magnesium sulfate; concentrating under reduced pressure for removing toluene; and performing silica gel column chromatography on a concentrated solution to obtain the 2-isopropyl thioxanthone. In the method, the solid super-acid is taken as a catalyst, a technology is easy to operate, high transformation ratio is achieved, a small quantity of three wastes are produced, convenience is brought to post-treatment, and the solid acid can be used repeatedly; and the method is an economical, practical and environment-friendly technology.
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Description

(1) Technical field

[0001] The invention relates to a preparation method of a photoinitiator, in particular to a preparation method of 2-isopropylthioxanthone by using a solid superacid one-pot method. (2) Background technology

[0002] Thioxanthone compounds are a class of better photoinitiators with excellent optical properties, and can be used as synthetic intermediates of UV-curable materials, DNA fluorescent probes, and initiators in free radical polymerization reactions. The molecular weight of the polymer is controlled during the polymerization reaction. In addition, these compounds also have biological activities such as antitumor. At present, the synthesis methods of thioxanthone can be summarized as follows: 1) Polyphosphoric acid catalyzes the synthesis of thioxanthone compounds; 2) Utilizes concentrated sulfuric acid to catalyze the synthesis of thioxanthone compounds; 3) Synthesis of sulfur Xanthone compounds; 4) Synthesis of thioxanthone compounds through ben...

Claims

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