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61.
Benzynes, generated in situ from 2-(trimethylsilyl)aryl triflates and cesium fluoride, undergo allylalkynylation with allylic chlorides and alkynylstannanes in the presence of palladium catalyst to give 1-allyl-2-alkynylbenzenes in good to excellent yields. [reaction: see text] 相似文献
62.
The conjugated polymer poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV) is an important electrooptical material, which is useable as an excellent laser media. In this paper, we present the absorption and fluorescence spectral characteristics of MEH-PPV in a few organic solvents. The paper shows that MEH-PPV exists in an excimeric state in benzene, and that the laser action as shown here arises from a liquid excimeric state. 相似文献
63.
[reaction: see text] In this paper, we wish to report the intramolecular [2 + 2 + 2] cocyclotrimerization of nitrilediynes catalyzed by the CoI2(dppe)/Zn system at 80 degrees C in CH3CN. Under these reaction conditions, various highly substituted nitrilediynes having steric conjunction at the alpha and beta positions to a nitrile group and a bulkier substitution at the terminal carbon of alkyne undergo [2 + 2 + 2] cocylotrimerization to afford tetra- and pentacyclic pyridine derivatives in good to excellent yields. 相似文献
64.
A ruthenium-catalyzed chelation-assisted C-H bond activation of aromatic ketones and the reaction with olefins to provide Heck-type products in good to excellent yields with a high regio- and stereoselective manner is described. 相似文献
65.
Bhuvaneswari S Jeganmohan M Cheng CH 《Chemical communications (Cambridge, England)》2008,(40):5013-5015
The three-component coupling of benzynes with terminal alkynes and activated alkenes in the presence of CuI, PCy(3) and CsF in a 1:1 mixture of CH(3)CN and THF at 50 degrees C for 5 h gave 1-alkyl-2-alkynylbenzenes in good to moderate yields. 相似文献
66.
The feature article surveys the transition metal-catalyzed three-component coupling of allenes and the related allylation reactions. Most of the reactions shown in the article mechanistically proceed via oxidative addition of organic electrophiles to metals, followed by carbometallation of allene and then transmetalation by main group metals or reagents and organometallic reagents. These reactions provide an efficient route for the synthesis of various substituted allyl and vinyl metal reagents and complex organic molecules in highly regio-, stereo- and chemoselective manner in one pot. The metal reagents or pi-allyl-metal intermediates obtained from the reaction are utilized for the allylation of aldehydes, ketones and imines, producing various homoallylic alcohols and amines in a highly regio- and stereoselective manner. 相似文献
67.
Padala K Pimparkar S Madasamy P Jeganmohan M 《Chemical communications (Cambridge, England)》2012,48(57):7140-7142
A ruthenium-catalyzed oxidative coupling of substituted aromatic and heteroaromatic esters with alkenes in the presence of catalytic amounts of AgSbF(6) and Cu(OAc)(2) to provide highly substituted alkene derivatives in good to excellent yields under an open atmosphere is described. 相似文献
68.
Sambath Baskaran Masilamani Tamizmani Thanigachalam Mahalakshmi Chinnappan Sivasankar 《Journal of computational chemistry》2012,33(10):1047-1054
The viability of making [Fe(CB6)L] (L = H2, N2, O2, nitric oxide [NO?, NO, and NO+], CO2, and hydrocarbons [CH4, C2H6, C2H4, and C6H6]) has been investigated by density functional theory (DFT) calculations. The complexes 2 – 18 are thermodynamically stable and may be synthesized. The small molecules are activated to some extent after complexation. Molecular orbital and ΔG calculation revealed that the molecular hydrogen and hydrocarbons can be chemically adsorbed and desorbed on [Fe(CB6)] without any significant chemical modification and therefore [Fe(CB6)] may serve as a storage material. The N2, O2, and nitric oxide (NO?, NO, and NO+) can be activated using [Fe(CB6)]. Proton, carbon, boron, and nitrogen NMR chemical shift calculation predicts drastic chemical shift difference before and after the complexation of [Fe(CB6)] with small molecules. This new findings suggest that the CB62? ligand‐based complex may provide several applications in the future. © 2012 Wiley Periodicals, Inc. 相似文献
69.
[reaction: see text] An efficient ring closure of 2-iodophenoxy-, 2-iodobenzyloxy-, and 2-iodobenzylaminoallenes followed by ring opening of oxabenzonorbornadienes leading to the synthesis of 2-benzofuranyl, 1H-isochromenyl, or 1,2-dihydroisoquinoline methyl-1,2-dihydro-1-naphthalenol derivatives catalyzed by palladium complexes is described. 相似文献