- Preparation method for alpha-hydroxy ketone bifunctional photoinitiator
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The invention provides a preparation method for an alpha-hydroxy ketone bifunctional photoinitiator. The preparation method comprises the following steps: with 4,4'-diisobutyryl diphenyl ether as a raw material, allowing the 4,4'-diisobutyryl diphenyl ether to react with chlorine, and carrying out hydrolyzing, crystallizing and purifying so as to obtain a product. The preparation method provided by the invention is high in yield, good in product appearance and low in cost, and has advantages in industrial production. In the step of a chlorination reaction, side reactions are effectively controlled; and in the step of hydrolysis, the problem of difficult layering of a water phase and an organic phase generated by using phase transfer catalysis and phase transfer catalysis is avoided.
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Paragraph 0018-0030
(2020/06/02)
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- PROCESS FOR PREPARING ARYL KETONE
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A process for preparing aryl ketones is disclosed. The process includes photo-oxidizing a compound of formula (V), (VI), (VII) or (VIII): in the presence of an oxidative system comprising at least one bromide compound to form aryl ketones. X1, X2, R1, R2, R3, L1, L2, L3, L4, t, n, m and p have the meanings as described in the specification and claims.
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Paragraph 0176; 0180
(2017/06/12)
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- Highly efficient C-H hydroxylation of carbonyl compounds with oxygen under mild conditions
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A transition-metal-free Cs2CO3-catalyzed α-hydroxylation of carbonyl compounds with O2 as the oxygen source is described. This reaction provides an efficient approach to tertiary α-hydroxycarbonyl compounds, which are highly valued chemicals and widely used in the chemical and pharmaceutical industry. The simple conditions and the use of molecular oxygen as both the oxidant and the oxygen source make this protocol very environmentally friendly and practical. This transformation is highly efficient and highly selective for tertiary C(sp3)-H bond cleavage. OH, so simple! A transition-metal-free Cs2CO 3-catalyzed α-hydroxylation of carbonyl compounds with O 2 provided a variety of tertiary α-hydroxycarbonyl compounds (see scheme; DMSO=dimethyl sulfoxide), which are widely used in the chemical and pharmaceutical industry. The simple conditions and the use of molecular oxygen as both the oxidant and the oxygen source make this protocol very efficient and practical.
- Liang, Yu-Feng,Jiao, Ning
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p. 548 - 552
(2014/01/23)
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- PROCESS FOR THE PREPARATION OF AROMATIC ALPHA-HYDROXY KETONES
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Process for the preparation of aromatic alpha-hydroxyketones (aromatic α-hydroxyketones) that does not require the use of chlorine, sulfuryl chloride or bromine and comprises the halogenation of an intermediate aromatic ketone with a hydrogen halide in the presence of an oxidising compound.
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Page/Page column 5
(2011/04/18)
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- PROCESS FOR THE PREPARATION OF AROMATIC ALPHA-HYDROXY KETONES
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Process for the preparation of aromatic alpha-hydroxyketones (aromatic α- hydroxyketones) that does not require the use of chlorine, sulfuryl chloride or bromine and comprises the halogenation of an intermediate aromatic ketone with a hydrogen halide in the presence of an oxidising compound.
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Page/Page column 16
(2010/01/29)
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- White solid photoinitiator in the form of powder and preparation thereof
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The present invention is refereed to a white solid photoinitiator in the form of powder and consisting of 2-hydroxy-1-{4-[4-(2-hydroxy-2-methyl-propionyl)-phenoxy]-phenyl}-2-methyl-propan-1-one (COMPOUND1), and to the procedure for its preparation.
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- WHITE SOLID PHOTOINITIATOR IN THE FORM OF POWDER AND PREPARATION THEREOF
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The present invention is referred to a white solid photoinitiator in the form of powder and consisting of 2-hydroxy-1 -{4-[4-(2-hydroxy-2-methyl-propionyl)-phenoxy]-phenyl}-2-methyl-propan-1 -one (COMPOUND1), and to the procedure for its preparation.
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Page/Page column 7/7-8/8
(2008/06/13)
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