نتایج جستجو برای: fluorinated hydrocarbons

تعداد نتایج: 30992  

Journal: :Science 2012
Wei Liu Xiongyi Huang Mu-Jeng Cheng Robert J Nielsen William A Goddard John T Groves

Despite the growing importance of fluorinated organic compounds in drug development, there are no direct protocols for the fluorination of aliphatic C-H bonds using conveniently handled fluoride salts. We have discovered that a manganese porphyrin complex catalyzes alkyl fluorination by fluoride ion under mild conditions in conjunction with stoichiometric oxidation by iodosylbenzene. Simple alk...

Journal: :Chinese Journal of Catalysis 2022

The electrochemical reduction of CO2 towards hydrocarbons is a promising technology that can utilize and prevent its atmospheric accumulation while simultaneously storing renewable energy. However, current electrolyzers remain impractical on large scale due to the low densities faradaic efficiencies (FE) various electrocatalysts. In this study, hybrid HKUST-1 metal-organic framework–fluorinated...

Journal: :The Journal of biological chemistry 1984
D R Thakker H Yagi J M Sayer U Kapur W Levin R L Chang A W Wood A H Conney D M Jerina

Metabolism of trans-7,8-dihydroxy-7,8-dihydro-6-fluorobenzo(a)pyrene by liver microsomes from 3-methylcholanthrene-treated rats and by a highly purified monooxygenase system, reconstituted with cytochrome P-450c, has been examined. Although both the fluorinated and unfluorinated 7,8-dihydrodiol formed from benzo(a)pyrene by liver microsomes share (R,R)-absolute configuration, the fluorinated di...

2016
Wei Feng Peng Long Yiyu Feng Yu Li

Fluorinated graphene, an up-rising member of the graphene family, combines a two-dimensional layer-structure, a wide bandgap, and high stability and attracts significant attention because of its unique nanostructure and carbon-fluorine bonds. Here, we give an extensive review of recent progress on synthetic methods and C-F bonding; additionally, we present the optical, electrical and electronic...

Journal: :The Journal of organic chemistry 2012
Zachary R Woydziak Liqiang Fu Blake R Peterson

Fluorination of fluorophores can substantially enhance their photostability and improve spectroscopic properties. To facilitate access to fluorinated fluorophores, bis(2,4,5-trifluorophenyl)methanone was synthesized by treatment of 2,4,5-trifluorobenzaldehyde with a Grignard reagent derived from 1-bromo-2,4,5-trifluorobenzene, followed by oxidation of the resulting benzyl alcohol. This hexafluo...

2018
Qian Feng Wenqing Xiao Yuan Liu Yongping Zheng Yuda Lin Jiaxin Li Qingying Ye Zhigao Huang

A novel approach has been developed to synthesize slightly fluorinated graphene quantum dots (GQDs-F) through thermal cutting of highly fluorinated graphene. The fluorinated graphene with substantial structure defects is fragile and is readily attacked. The direct evaporation of abundant CFn (n = 2, 3) groups near structure defects lead to the loss of adjacent skelton C atoms, and the fluorinat...

Journal: :The Journal of antibiotics 1995
L C Creemer H A Kirst T R Shryock J B Campbell A G Webb

A new fluorinated analog of tilmicosin was synthesized by the reductive amination of desmycosin with 3,5-bis(trifluoromethyl)piperidine. Despite an apparently small change in structure, the fluorinated analog had much less in vitro antimicrobial activity than tilmicosin and it failed to protect 3-day old chicks against a Pasteurella multocida challenge at 64 mg/kg sc. In a preliminary in vivo f...

Journal: :Chemical communications 2009
Xiao Han Jie Luo Chen Liu Yixin Lu

Organocatalytic asymmetric Michael reactions of fluorinated nucleophiles with nitroolefins catalyzed by Cinchona alkaloid-derived thiourea catalysts generated the desired Michael products containing vicinal fluorinated quaternary and tertiary chiral centers with exceptional enantioselectivity.

2015
D. K. Sarkar M. Farzaneh

Nanosphere lithography (NSL) masks were created by spin-coating of polystyrene particles onto silicon surfaces. Fluorinated hydrocarbon films were coated on the nanosphere lithography masks using plasma-enhanced chemical vapor deposition (PECVD) to obtain ordered arrays of fluorinated hydrocarbon. Atomic force microscope images show hexagonally ordered nanodots of dimension 225 ± 11 nm with a h...

2012
Alessandro Belardini

Organic fluorinated materials demonstrate their excellent electro-optic properties and versatility for technological applications. The partial substitution of hydrogen with fluorine in carbon-halides bounds allows the reduction of absorption losses at the telecommunication wavelengths. In these interesting compounds, the electro-optic coefficient was typically induced by a poling procedure. The...

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