82799-44-8Relevant articles and documents
Preparation method of thioxanthone photoinitiator
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Paragraph 0057-0063; 0070-0075; 0082-0096, (2021/05/12)
The invention relates to a preparation method of a thioxanthone photoinitiator, particularly relates to a preparation method of 2,4-diethyl thioxanthone and isopropyl thioxanthone, and is characterized in that the 2,4-diethyl thioxanthone and isopropyl thioxanthone are prepared by taking dithiosalicylic acid as a raw material and adopting a combined catalyst, and the 2,4-diethyl thioxanthone and isopropyl thioxanthone are both thioxanthone photoinitiators. According to the method, the catalyst can be recycled and reused, and meanwhile, the defects that a large amount of sulfuric acid is used and a large amount of sulfonation byproducts are generated in the reaction in the traditional process are avoided. According to the method, the raw materials are cheap and easy to obtain, the yield is high, the catalyst can be recycled and continuously used, and the preparation method is cheap, environmentally friendly, easy to operate and suitable for industrialization.
One-pot synthesis technology of photo initiator 2,4-diethylthioxanthone
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Paragraph 0008; 0027-0030, (2020/03/09)
The invention discloses a one-pot synthesis technology of a photo initiator 2,4-diethylthioxanthone. The invention belongs to the field of fine chemical engineering, and specifically relates to a one-pot synthesis technology of a photo initiator 2,4-diethylthioxanthone. According to the technology, thiosalicylic acid (or dithiosalicylic acid) and 1,3-diethylbenzene are taken as the raw materials,concentrated sulfuric acid is taken as a catalyst and a solvent, and under the action of a co-catalyst, condensation reactions are carried out for 4 to 8 hours at a temperature of 0-70 DEG C. Post treatment technologies (condensation, extraction, concentration, and recrystallization) are carried out in one reaction unit; the obtained product is filtered and dried to obtain high purity 2,4-diethylthioxanthone. The technology has the advantages of good selectivity, low reaction temperature, short reaction time, high yield, simple and convenient operation, and high efficiency of single kettle, the equipment investment, the energy consumption, the operation strength, and the production cost are reduced, and the technology is suitable for industrial production.
A sulfur mixed anthracene compound photocatalytic oxidation synthesis method (by machine translation)
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Paragraph 0042-0043, (2019/02/04)
The present invention discloses a sulfur mixed anthracene compound photocatalytic oxidation synthesis method, sulfur mixed anthracene compound as a reaction substrate, in order to 2, 3 - dichloro - 5, 6 - dinitrile - 1, 4 - benzoquinone (DDQ) and tert-butyl nitrite (TBN) as catalyst, in order to acetic acid as the reaction additive, to oxygen as the oxidizing agent, the reaction substrate in 1, 2 - dichloroethane in the solvent, and the blue light illumination at normal temperature and under the conditions of reaction, after the reaction is completed after the separation and processed to obtain the sulfur mixed anthracene compound. The synthesizing method of the invention, in order to light the reaction to replace the traditional heating reaction, the energy can be saved; without the use of a transition metal catalyst; under the condition of optimizing, the yield is high. (by machine translation)