cas 5495-84-1, 2-Isopropylthioxanthone | Articles data

Articles about 5495-84-1Total 14 be found

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Preparation process of photoinitiator 2-/4-isopropyl thioxanthone
The invention provides a preparation process of a photoinitiator 2-/4-isopropyl thioxanthone, which comprises the following steps: by taking dithiobenzoic acid as a raw material, and carrying out substitution condensation on an intermediate 2-chloromercaptobenzoyl chloride and isopropyl benzene under an anhydrous condition by taking a boron trifluoride complexing agent as a condensing agent; after condensation, carrying out reduced-pressure solvent removal, water washing treatment and high-vacuum distillation to obtain a 2-/4-isopropyl thioxanthone crude product, and refining the crude product to obtain a 2-/4-isopropyl thioxanthone refined product. The method has the advantages that generation of three wastes is greatly reduced, the production cost is reduced, the sewage treatment pressure is reduced, the production efficiency is improved, and the method is suitable for mass production of products.
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Paragraph 0022-0025

(2022/01/10)

Ultraviolet-light-induced aerobic oxidation of benzylic C(sp3)-H of alkylarenes under catalyst- and additive-free conditions
A mild and efficient system has been discovered for the synthesis of α-aryl carbonyl compounds via oxidation of benzylic C–H to C[dbnd]O bonds. This ultraviolet-light-mediated oxygenation reaction exhibited excellent substrate scope including various xanthenes, thioxanthenes and 9, 10-dihydroacridines and afforded the corresponding ketones with good to excellent yields under catalyst- and additive-free conditions at room temperature.
Zhou, Jiacheng,Li, Meichao,Li, Tianci,Li, Chunmei,Hu, Xinquan,Jin, Liqun,Sun, Nan,Hu, Baoxiang,Shen, Zhenlu
(2021/02/01)

Preparation method of thioxanthone photoinitiator
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.
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Paragraph 0064-0069

(2021/05/12)

Ultraviolet light promoted synthesis method of thioxanthone compounds
The invention discloses an ultraviolet light promoted synthesis method of a thioxanthone compound. The preparation method comprises the following steps: carrying out a reaction in 1,2-dichloroethane at normal temperature under the condition of 380-385 nm ultraviolet irradiation by taking a thioxanthone compound as a reaction substrate and taking oxygen in air as an oxidizing agent, and after the reaction is finished, carrying out separation treatment to obtain the thioxanthone compound. According to the synthesis method disclosed by the invention, the traditional heating reaction is replaced by an illumination reaction, so that energy sources can be saved, and any catalyst is not used.
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Paragraph 0025-0026

(2020/06/02)

2 - Isopropyl thioxanthone preparation method
The invention relates to and provides a method for preparing 2-isopropyl thioxanthone by enabling raw material 2-chloro-2'-methoxy-5'-isopropyl diphenyl ketone or 2-chloro-2'-ethoxy-5'-isopropyl diphenyl ketone to react with powdered sulfur in the presence of an alkaline substance and copper powder. The method provided by the invention is a process for preparing 2-isopropyl thioxanthone with the advantages of no use of a solvent difficult to recycle, high content, few impurities, fast reaction, low raw material consumption and simple and convenient aftertreatment.
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Paragraph 0020; 0042-0044; 0045-0047; 0051-0053; 0054-0056

(2019/10/23)

Preparation method of 2-isopropylthioxanthone
The invention relates to a preparation method of a photoinitiator 2-isopropylthioxanthone. The method is concretely characterized in that 2-(4-isopropylthiophenyl)benzoic acid undergoes a ring-closingreaction under a refluxing dehydration condition to prepare the 2-isopropylthioxanthone. The method has the advantages of small use amount of concentrated sulfuric acid, small environmental pressureand good product appearance.
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Paragraph 0016-0026

(2019/07/04)

Visible-Light-Induced Aerobic Oxidation of Benzylic C(sp 3)-H of Alkylarenes Promoted by DDQ, tert -Butyl Nitrite, and Acetic Acid
A visible-light photocatalytic aerobic oxidation of benzylic C(sp 3)-H bonds proceeded in the presence of 2,3-dichloro-5,6-dicyano-1,4-benzoquinone, tert -butyl nitrite, and acetic acid. Advantages of this aerobic oxidation method include its relatively mild conditions, the use of visible-light irradiation instead of conventional thermal methods, the use of a low catalyst loading, and the ability to oxidize a range of alkylarenes, including xanthenes, thioxanthenes, and 9,10-dihydroacridines, to the corresponding ketones in excellent yields.
Pan, Decheng,Wang, Yiqing,Li, Meichao,Hu, Xinquan,Sun, Nan,Jin, Liqun,Hu, Baoxiang,Shen, Zhenlu
p. 218 - 224
(2019/01/14)

A sulfur mixed anthracene compound photocatalytic oxidation synthesis method (by machine translation)
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)
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Paragraph 0040-0041

(2019/02/04)

Preparation methods of acyl chloride and thioxanthone
The present invention relates to the field of fine chemicals and pharmaceutical chemicals, particularly to new economical preparation process technologies of ortho-chlorosulfenyl aroyl chloride and thioxanthone compounds, and applications of the thioxanthone compounds in synthesis of photoinitiators or other new material chemicals.
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Paragraph 0017

(2018/04/01)

Method for catalytic oxidization synthesis of anthone compound
The invention discloses a method for catalytic oxidation synthesis of an anthone compound. The method is carried out according to the following steps: adding an anthene compound, Fe(NO3)3*9H2O and a fluorine-containing inorganic salt into an acetonitrile solvent, and performing a reaction for 2-12h at 75-85 DEG C under a normal pressure oxygen condition to obtain the anthone compound, wherein the mass ratio of the reaction substrate namely the anthone compound, Fe(NO3)3*9H2O and the fluorine-containing inorganic salt is 100:(8-15):(15-30), and after the completion of the reaction, the anthone compound can be obtained by adopting conventional column separation purification. The method provided by the invention is simple, convenient and safe to operate, and has the following beneficial effects: A) clean oxygen is used as an oxidant in the method, so that the environmental cost is greatly reduced; and B) Fe(NO3)3*9H2O is used as a catalyst in the method, so that the cost is low.
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Paragraph 0042

(2017/07/21)

O-acyloxime photoinitiators
Oximeester compounds of the formulae I, II, III and IV whereinR1 is phenyl, C1-C20alkyl or C2-C20alkyl optionally interrupted by —O—, C2-C20alkanoyl or benzoyl, or R1 is C2-C12alkoxycarbonyl or phenoxycarbonyl; R1′ is C2-C12alkoxycarbonyl, or R1′ is phenoxycarbonyl, or R1′ is —CONR10R11 or CN; R2 is C2-C12alkanoyl, C4-C6alkenoyl, benzoyl, C2-C6alkoxycarbonyl or phenoxycarbonyl; R3, R4, R5, R6 and R7 are hydrogen, halogen, C1-C12alkyl, cyclopentyl, cyclohexyl, phenyl, benzyl, benzoyl, C2-C12alkanoyl, C2-C12alkoxycarbonyl, phenoxycarbonyl or a group OR8, SR9, SOR9, SO2R9 or NR10R11; R4′, R5′ and R6′ are hydrogen, halogen, C1-C12alkyl, cyclopentyl, cyclohexyl, phenyl, benzyl, benzoyl, C2-C12-alkanoyl, C2-C12alkoxycarbonyl, phenoxycarbonyl, or are a group OR8, SR9, SOR9, SO2R9, NR10R11; provided that at least one of R3, R4, R5, R6, R7, R′4, R′5 and R′6 is OR8, SR9 or NR10R11; R8, R9, R10 and R11 are for example hydrogen, C1-C12alkyl, phenyl; are suitable as initiators for the photopolymerization of radically polymerizable compounds.
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(2008/06/13)

Process for the preparation of thioxanthones
Processes are described for the preparation of thioxanthones (Formula I). A reactant mixture of a 2-chlorothiobenzoyl chloride (Formula II) and an aromatic compound (Formula III) is added to a slurry of a Friedel-Crafts catalyst in an organic Friedel-Crafts solvent. Products of the processes may be used for the preparation of a pharmaceutical product for use in the field of psycho-therapeutics, or as activators or sensitizers in the photo-polymerization of ethylenically unsaturated monomers.
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Page 4

(2008/06/13)

Process for preparing thioxanthone and derivatives thereof
A process for preparing thioxanthone and derivatives thereof is disclosed. In the process, an aromatic compound, such as cumene, is reacted with thiosalicylic acid (TSA) or dithiosalicylic acid (DTSA) in the presence of sulfuric acid. The reaction mixture, which includes thioxanthone or a derivative thereof, is thereafter distilled under reduced pressure to recover the thioxanthone compound.
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Page 6

(2008/06/13)

Method for producing xanthone and thioxanthone compounds useful as photoinitiators
A method for preparing a compound of formula I STR1 in which X is O or S; both groups R together with the two carbon atoms to which they are attached form a fused aromatic group; R1 is an organic radical; and n is 0, 1, 2 or 3 comprising reacting a compound of formula II STR2 where R, R1 and n are defined above and where each R3, independently, is C1-12 alkoxy or one R3 is C1-12 alkoxy and the other R3 is halogen, with elemental sulphur in an alkaline medium, a metal sulphide or a metal hydrosulphide. Compounds of formula I and formula II are useful as photoinitiators.
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(2008/06/13)