نتایج جستجو برای: ethylene bis

تعداد نتایج: 75440  

Journal: :Chemical reviews 2004
Kang Xu

2.1. Solvents 4307 2.1.1. Propylene Carbonate (PC) 4308 2.1.2. Ethers 4308 2.1.3. Ethylene Carbonate (EC) 4309 2.1.4. Linear Dialkyl Carbonates 4310 2.2. Lithium Salts 4310 2.2.1. Lithium Perchlorate (LiClO4) 4311 2.2.2. Lithium Hexafluoroarsenate (LiAsF6) 4312 2.2.3. Lithium Tetrafluoroborate (LiBF4) 4312 2.2.4. Lithium Trifluoromethanesulfonate (LiTf) 4312 2.2.5. Lithium Bis(trifluoromethanes...

Journal: :Chemical communications 2013
Xiaoping Yang Michael M Oye Richard A Jones Shaoming Huang

Reactions of H2salen (H2L, N,N'-ethylene bis(salicylideneimine)) with Yb(CF3SO3)3, Yb(OAc)34H2O and Yb(NO3)36H2O in MeOH–EtOH under reflux gave NIR luminescent complexes [Yb6L9(H2L)2] (1), [Yb3L3(HL)(OH)2] (2) and [Yb2L2(H2L)2(NO3)(MeOH)2]NO3 (3), respectively.

Journal: :European Journal of Organic Chemistry 2023

A small macrocycle comprising ether-bridged naphthyl units was prepared in a two-step synthesis. Single-crystal X-ray diffraction of two polymorphs are reported, one which showed multiple C−H⋅⋅⋅πnaphthyl interactions solvent molecule the cavity macrocycle. Chemical reduction led to C−O bond cleavages accompanied by Z/E isomerization. The resulting twofold negatively charged (E)-1,2-bis(2-naphth...

Journal: :Chemistry 2011
María Martín-Rodríguez Carmen Nájera José M Sansano Abel de Cózar Fernando P Cossío

The 1,3-dipolar cycloaddition between azomethine ylides and alkenes is efficiently catalysed by [{(S(a))-Binap-Au(tfa)}(2)] (Binap=2,2'-bis(diphenylphosphino)-1,1'-binaphthyl; tfa=trifluoroacetyl). Maleimides, 1,2-bis(phenylsulfonyl)ethylene, chalcone and nitrostyrene were suitable dipolarophiles even when using sterically hindered 1,3-dipole precursors. The results obtained in these transforma...

Journal: :Chemical communications 2011
Tanya K Ronson Harriott Nowell Aleema Westcott Michaele J Hardie

A new carboxylic acid functionalised cavitand forms [Cu(3)L(2)] metallo-cryptophanes with Cu(OAc)(2) that can be linked together into dimers with the bridging ligand 1,2-bis(4-pyridyl)ethylene. Reaction of the cavitand with Co(OAc)(2) gives a metallo-cryptophane with a central Co(7) cluster.

Journal: :Molecules 2007
Lida Fotouhi Saeed Dehghanpour Majid M Heravi Mahboobeh Dashti Ardakani

A novel, mixed-valent copper(I)-copper(II) complex, {[bis(ethylene-diamine)copper(II)] bis[diiodocuprate(I)]} (1), has been prepared by electrochemical dissolution of a sacrificial copper anode in a solution of ethylenediamine (en), I2 and tetraethylammoniumperchlorate (TEAP) as supporting electrolyte in acetonitrile (AcN)and characterized by single-crystal X-ray structure determination. The cr...

Journal: :Bulletin of the Chemical Society of Japan 1959

Journal: :Chemical communications 2011
Weihua Wang Shiyong Wang Yuning Hong Ben Zhong Tang Nian Lin

We studied the supramolecular assembly of a multifunctional ligand, cis-bis-terpyridine tetraphenyl ethylene, on a Cu(111) surface by low-temperature scanning tunneling microscopy (STM). Three distinctive supramolecular structures, metallacycles, propeller-shaped clusters and extended linear chains, are formed under specific assembly conditions owing to different inter-molecular binding modes o...

Journal: :Chemical communications 2007
Stefano Avedano Lorenzo Tei Alberto Lombardi Giovanni B Giovenzana Silvio Aime Dario Longo Mauro Botta

Two new GdEGTA (EGTA = ethylene glycol-bis(2-aminoethylether)-N,N,N',N'-tetraacetic acid) derivatives incorporating aromatic moieties into the oxoethylenic bridge have been prepared and characterised, their conjugates to HSA investigated and an unprecedented high relaxivity, close to that predicted by theory, interpreted in terms of the combined effect of restricted local rotation and fast rate...

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