نتایج جستجو برای: oxygen bridged dihydropyrimidinone

تعداد نتایج: 215526  

2004
Ayhan Elmali

The crystal structure of L’Cu(Me2CO)Nd(NO3)3 (L’ = N,N’-bis(2-hydroxy-3-methoxybenzylidene)-ethylenediamine) was determined and the magnetic properties of the complex were investigated. (C18H18N2O4)Cu(C3H6O)Nd(NO3)3, monoclinic, space group P21/c, with a = 9.8792(9), b = 18.904(4), c = 15.667(2) Å, β = 95.360(10)◦ , V = 2913.1(8) Å3, Z = 4. The central region of the complex is occupied by CuII ...

Journal: :Chemistry: A European Journal 2021

The novel diacetylene bridged terphenylic macrocycle 1 is presented and discussed in the context of rotationally restricted Gelander oligomers. 1,4-bis(phenylbuta-1,3-diyn-1-yl) benzene bridge significantly longer than its terphenyl backbone, forcing to bend around central pylon. synthesis molecule based a large extent on acetylene scaffolding strategies, profiting from orthogonal alkyne protec...

2014
John J Kendall Angelica M Barrero-Tobon David R Hendrixson David J Kelly

Microaerophilic bacteria are adapted to low oxygen environments, but the mechanisms by which their growth in air is inhibited are not well understood. The citric acid cycle in the microaerophilic pathogen Campylobacter jejuni is potentially vulnerable, as it employs pyruvate and 2-oxoglutarate:acceptor oxidoreductases (Por and Oor), which contain labile (4Fe-4S) centres. Here, we show that both...

Journal: :Journal of the American Chemical Society 2014
Ming Wang Zhijian Huang Jianfeng Xu Yonggui Robin Chi

The first N-heterocyclic carbene (NHC)-catalyzed [3+4] cycloaddition of azomethine imines and enals is disclosed. Oxidative catalytic remote activation of enals affords 1,4-dipolarophile intermediates that react with 1,3-dipolar azomethine imines to generate dinitrogen-fused seven-membered heterocyclic products with high optical purities. Our approach also provides effective kinetic resolution ...

Journal: :Dalton transactions 2010
Julia V Dickschat Slawomir Urban Tania Pape Frank Glorius F Ekkehardt Hahn

The N,N'-dimesitylene substituted o-phenylenediamine 1 reacts with Sn[N(SiMe(3))(2)](2) under formation of the monomeric N-heterocyclic stannylene 2, while the chiral N,N'-substituted o-phenylenediamine 3 reacts with E[N(SiMe(3))(2)](2) (E = Ge, Sn) under formation of the chiral germylene 4 and the chiral stannylene 5, respectively. X-Ray diffraction studies with both stannylenes demonstrated t...

2016
Melvyn B. Ansell George E. Kostakis Holger Braunschweig Oscar Navarro John Spencer

The bis(N-heterocyclic carbene)(diphenylacetylene)palladium complex [Pd(ITMe)2(PhC≡CPh)] (ITMe=1,3,4,5-tetramethylimidazol-2-ylidene) acts as a highly active pre-catalyst in the diboration and silaboration of azobenzenes to synthesize a series of novel functionalized hydrazines. The reactions proceed using commercially available diboranes and silaboranes under mild reaction conditions.

Journal: :Chemical communications 2014
Bin-Miao Yang Kai Xiang Yong-Qiang Tu Shi-Heng Zhang Deng-Tao Yang Shao-Hua Wang Fu-Ming Zhang

A six-membered N-heterocyclic carbene fused with a spiro-scaffold is designed. The new NHC shows stronger σ-donation ability than typical 5-membered NHCs. This property leads to interesting reactivities of this spiro-fused six-membered NHC. For example, the NHC-BF3 Lewis pair complex can be readily prepared by using LiBF4 as the BF3 source, or through a direct bond-reconstruction of the tetrafl...

Journal: :Chemical communications 2014
Wataru Setaka Soichiro Ohmizu Mitsuo Kira

Macrocage molecules with a bridged rotor have been synthesized as molecular gyroscopes. The kinetics of the oxidation reaction of the thiophene-bridged molecular gyroscope, whose thiophene ring was bridged inside a silaalkane cage, was investigated. A remarkable kinetic stabilization against the oxidation of the thiophene moiety induced by the molecular cage framework was observed.

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