A General Protocol for C−H Difluoromethylation of Carbon Acids with TMSCF
<sub>2</sub>
Br
作者:Qiqiang Xie、Ziyue Zhu、Lingchun Li、Chuanfa Ni、Jinbo Hu
DOI:10.1002/anie.201900763
日期:2019.5.6
efficient method for the selectiveC‐difluoromethylation of carbon acids with the reagent TMSCF2Br has been developed. A variety of structurally diverse sp3‐ and sp‐hybridized carbon nucleophiles, including esters, amides, fluorenes, terminal alkynes, β‐ketoesters, malonates, and other activated C−H nucleophiles, could be efficiently and selectively transformed into the corresponding C‐difluoromethylated
Chromophoric compounds and process for their preparation
申请人:Siemens Aktiengesellschaft
公开号:US06284889B1
公开(公告)日:2001-09-04
The invention relates to chromophoric NLO-active compounds of the general formula
and to a process for preparing such compounds.
The compounds according to the invention can be used for preparing NLO-active polymers and thus for constructing electrooptical and photonic components.
Polyadducts produced from nonlinear-optically active copolymers and polymerizable nonlinear-optically active monomers
申请人:Siemens Aktiengesellschaft
公开号:US20010053818A1
公开(公告)日:2001-12-20
The present invention relates to nonlinear-optically active copolymers which are composed of a chromophore acrylate, a glycidyl-functional acrylate, and a further acrylate unit, and to polyadducts produced from them by crosslinking with a carboxyl-functional polyester. The nonlinear-optical copolymers of the present invention, and the polyadducts prepared from them, possess an orientation stability in the crosslinked state, and a thermal stability, which makes them highly suitable for producing electrooptical and photonic components.
Copper Catalyzed Oxidative Arylation of Tertiary Carbon Centers
作者:Prakash Basnet、Melissa B. Sebold、Charles E. Hendrick、Marisa C. Kozlowski
DOI:10.1021/acs.orglett.0c03581
日期:2020.12.18
describe herein a Cu(OTf)2catalyzedoxidative arylation of a tertiary carbon-containing substrate including aryl malononitriles, 3-aryl benzofuran-2-ones, and 3-aryl oxindoles. In some cases, the nitrile groups of the aryl malononitriles undergo further reactions leading to lactones or imines. These reaction conditions are applicable for a range of arenes, including phenols, anilines, anisoles, and heteroarenes
A highly efficient catalytic system for cross-coupling of aryl chlorides and bromides with malononitrile anion by palladium carbene complexesElectronic supplementary information (ESI) available: experimental details. See http://www.rsc.org/suppdata/cc/b3/b302890a/
Six imidazolium chlorides (1–6) as precursors of 1,3-diaryl substituted N-heterocyclic carbene ligands were synthesized and evaluated in palladium-catalyzed cross-coupling reactions of aryl chlorides and bromides with malononitrile in the presence of NaH. Among them, 1,3-bis(2,4,6-triethylphenyl)imidazolium chloride (5) and 1,3-bis(2,4,6-triisopropylphenyl)imidazolium chloride (6) are novel. The catalytic system combining Pd(0) with imidazolium salts 4, 5 and 6 with bulky aryl groups in pyridine is found to be superior over others and afforded α-arylmalononitriles in high yields when employing a wide variety of substrates.