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Markus R. Heinrich Dr. 《Chemistry (Weinheim an der Bergstrasse, Germany)》2009,15(4):820-833
This minireview is aimed at giving an overview of recent advances in olefin functionalisation reactions involving aryl radicals generated from arenediazonium salts. Based on the well‐known Meerwein arylation, in which an aryl and a halogen substituent are coupled to an olefinic substrate, new reaction types have been developed that allow the introduction of a broad spectrum of other atoms and functional groups at the place of the original halogen atom and that are applicable to an extended range of olefinic substrates. 相似文献
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Antonio Luiz Braga Oscar E.D. Rodrigues Daniel J. Emmerich Claudio C. Silveira Manfredo Hörner Ezequiel M. Vazquez-Lopez 《Journal of chemical crystallography》1999,29(6):677-680
The reaction between 1-phenylsulphenyl-2-phenylethyne and p-toluenesulfonic acid in methylene chloride gives (Z)-1-(phenylsulphenyl)-2-phenylethenyl p-toluenesulfonate (1) in good yields. This reaction is both a regio- and a stereospecific cis addition, confirmed by X-ray crystal structure analysis of the title compound. 1 crystallizes in the monoclinic space group P21/n with the lattice parameters a = 10.556(3), b = 9.730(3), c = 19.687(3) Å, = 105.05(2)°, V = 1952.7(8) Å3, and Z = 4. The results of elemental analysis, IR and NMR spectroscopy are included. 相似文献
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Monique LüthyRichard J.K. Taylor 《Tetrahedron letters》2012,53(27):3444-3447
A practical procedure for the palladium-catalysed Suzuki-Miyaura coupling of various alkenyl tosylates with alkenyl MIDA boronates has been developed. Commercially available trans-bromo[N-succinimidyl-bis(triphenylphosphine)]palladium(II) [Pd(PPh3)2NBS] is an effective catalyst under the slow release conditions of MIDA boronates; with less activated alkenyl tosylates addition of the cheap, air-stable tricyclohexylphosphine tetrafluoroborate enhances reactivity. 相似文献
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Devdutt Chaturvedi Nisha Mishra Amit K. Chaturvedi Virendra Mishra 《Monatshefte für Chemie / Chemical Monthly》2008,139(12):1467-1470
A single-step novel protocol for the preparation of symmetrical trithiocarbonates from a corresponding variety of primary,
secondary, and tertiary alcoholic tosylates using the Cs2CO3/CS2 system, was developed. This protocol is mild and more efficient than the reported methods.
Correspondence: Devdutt Chaturvedi, Bio-Organic Chemistry Division, Indian Institute of Integrative Medicine, Canal Road,
Jammu-Tawi-18000, J&K, India. 相似文献
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An air-stable and easy-to-handle nickel precatalyst, (9-phenanthrenyl)Ni(II)(PPh3)2Cl, was examined for the cross-coupling reactions of aryl tosylates with arylboronic acids. Under the optimized reaction conditions, the catalytic system tolerates a wide range of activated, neutral and deactivated substrates. The selectivity of this cross-coupling reaction towards aryl tosylates and arylboronic acids has been investigated. It is proposed that ligand 1,1′-bis(diphenylphosphino)ferrocene (dppf) plays a key role in the coupling by enforcing a cis geometry in key intermediates and the active Ni(0) species. 相似文献
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Regioselective reaction of (Z)-dimethyl α-(bromomethyl) fumarate 2 with bulky secondary amines in ether as solvent at room temperature, leads exclusively to the rearranged substitution α-(functional alkyl amino) acrylic esters 4a-i in high yields. The less and more bulky amine gives rise respectively to the two successive (SN2′) and (SN2) substitution derivatives 5j,k and 51. 相似文献
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Palladium-catalyzed carbonylation of tosylates with phenyl formate is described. This procedure needs neither external carbon monoxide nor any pressure-resistant apparatus. A variety of cyclic and acyclic alkenyl tosylates can be converted into the corresponding phenyl esters in good yields. Furthermore, this method is effective for the one-pot synthesis of α,β-unsaturated amides. 相似文献