- NOVEL OXIME ESTER COMPOUND AND PHOTORESIST COMPOSITION CONTAINING THE SAME
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The present invention relate to an oxime ester compound represented by chemical formula A, and to a photoresist composition containing the same. The X, R1, R2 and R5 of the formula A are as described in the description of the invention. The present inventnion aims to provide the oxime ester compound as a novel photoinitiator which can be used as a photoresist composition.COPYRIGHT KIPO 2018
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Paragraph 0143-0146
(2019/02/13)
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- A Pd-catalyzed optional approach for the synthesis of dibenzothiophenes
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A direct and practical approach for the construction of DBTs was developed via a Pd-catalyzed tandem reaction, in which commercially available o-bromo-iodobenzenes combined with benzene thiols or iodobenzenes combined with o-bromo-benzene thiols were applied. These two approaches will provide an alternative for the synthesis of DBT derivatives.
- Song, Juan,Wu, Hao,Sun, Wei,Wang, Songjiang,Sun, Haisen,Xiao, Kang,Qian, Yan,Liu, Chao
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supporting information
p. 2083 - 2087
(2018/03/26)
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- Palladium catalysis based one-pot synthesis method for DBTs (dibenzothiophenes)
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The invention discloses a palladium catalysis based one-pot synthesis method for DBTs (dibenzothiophenes). An inorganic base is added to an N,N-dimethylacetamide solution, with a palladium catalyst/ligand as a catalysis system, o-bromoiodobenzene derivatives or iodobenzene derivatives and thiophenol derivatives taken as raw materials are subjected to a reaction in nitrogen atmosphere, and DBTs areobtained through separation. The simple, economical and easily available raw materials are taken as substrates, all-position-substituted DBTs are synthesized on the basis of palladium catalyzed cascade reaction, and DBTs have great application prospect in medical synthesis intermediates and organic optoelectronic material science.
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Paragraph 0046-0050
(2020/05/12)
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- Synthesis of functionalized dibenzothiophenes- An efficient three-step approach based on Pd-catalyzed C-C and C-S bond formations
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A novel and efficient three-step protocol for synthesizing functionalized dibenzothiophenes (DBTs) from common starting materials and by using palladium-catalyzed carbon-carbon and carbon-sulfur bond formations is presented. The reaction conditions offer significantly improved functional-group tolerance and regioselectivity as compared to previously reported methods. A flexible and concise three-step protocol for the synthesis of functionalized dibenzothiophenes DBTs from readily available starting materials is presented. The method is based on two palladium-catalyzed reactions to prepare the masked thiophenols 4followed by deprotection and in situ cyclization to form the DBT skeleton. This approach offers improved functional-group tolerance as well as regiocontrol in the synthesis of functionalized DBTs as compared to previously reported methods.
- Jepsen, Tue Heesgaard,Larsen, Mogens,Jorgensen, Morten,Solanko, Katarzyna A.,Bond, Andrew D.,Kadziola, Anders,Nielsen, Mogens Brondsted
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- Regiochemistry of the reaction between dibenzothiophene radical cation and nucleophiles or nitrogen dioxide
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The regiochemistry of nucleophile or radical attack upon dibenzothiophene radical cation (2?+) has been studied, using the photolysis of 2-tetranitromethane, the NO2 or nitrous acid catalyzed (NAC) nitration of 2 and the silver(II) mediated acetoxylation of 2 as test reactions in all likelihood mediated by 2?+. The results are discussed in relation to theoretical predictions based on the VBCM model. The photolysis of the charge-transfer complex of 2 and tetranitromethane in dichloromethane gives mainly dibenzothiophene sulfoxide (3) and minor amounts of 2-nitrodibenzothiophene (4), r-1-hydroxy-c-4-trinitromethyl-1,4-dihydro-dibenzothiophene (5), t-2-nitro-r-1 -trinitromethyl-1,2-dihydrodibenzothiophene (6) and c-1-nitro-r-4-trinitromethyl-1,4-dihydro-dibenzothiophene 7. In aceto-nitrile the major product is the sulfoxide 3 together with 2-nitrodibenzothiophene (4) and 4-nitrodibenzothiophene (9). The photolysis in 1,1,1,3,3,3-hexafluoro-propan-2-ol yields only the sulfoxide 3 and minor amounts of the 2-nitroarene 4. Nitration of 2 by NO2 in dichloromethane gives largely 3 and the 2-nitro isomer 4, as does NAC nitration in acetic acid. The oxidation of 2 by an AgII complex of 2,2′-bipyridine gave mainly 1- and 4-acetoxydibenzothiophene and a minor proportion of the 3-acetoxy isomer, no sulfoxide 3 being formed. The X-ray crystal structure is reported for compound 5. Acta Chemica Scandinavica 1997.
- Butts, Craig P.,Eberson, Lennart,Hartshorn, Michael P.,Radner, Finn,Robinson, Ward T.,Wood, Bryan R.
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p. 839 - 848
(2007/10/03)
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