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pro vyhledávání: '"35"'
Publikováno v:
Journal of the American Chemical Society. 130:15185-15192
A general method for copper-catalyzed arylation of sp (2) C-H bonds with p K a's below 35 has been developed. The method employs aryl halide as the coupling partner, lithium alkoxide or K 3PO 4 base, and DMF, DMPU, or mixed DMF/xylenes solvent. A var
Publikováno v:
Journal of the American Chemical Society. 122:2749-2757
The ability of surfactant aggregate−H2O interfaces to control the regioselectivity of Diels−Alder reactions has been investigated. Cycloadditions of surfactant 1,3-dienes 2-[[3-(dimethyldodecylsilyl)-1,3-butadien-2-yl]thio]-N,N,N-trimethyl-1-etha
Publikováno v:
Journal of the American Chemical Society. 118:3643-3655
[N3N]TaPPh ([N3N]3- = [(Me3SiNCH2CH2)3N]3-) reacts with excess lithium metal in tetrahydrofuran to give “[N3N]TaPLi”, as judged by NMR studies and by reactions with RX at −35 °C to afford the phosphinidene complexes [N3N]TaPR (R = Me, n-Bu, Si
Autor:
Armando Lopez, José A. Dobado, José F. Quílez del Moral, M. Mar Herrador, Alejandro F. Barrero, Victoriano Domingo, Horacio R. Dieguez, Jesús F. Arteaga
Publikováno v:
Journal of the American Chemical Society. 132(1)
Investigations detailed herein, including density functional theory (DFT) calculations, demonstrate that the formation of either alkoxy- or hydroxy-Ti(III) complexes considerably decreases the energy of activation for C-O bond homolysis. As a consequ
Publikováno v:
Journal of the American Chemical Society. 128(25)
Nickel complexes having a bulky tri(sec-alkyl)phosphine ligand catalyze hydroheteroarylation of alkynes at 35 degrees C. Selective activation of an Ar-H bond over an Ar-CN bond of N-protected 3-cyanoindoles is achieved by a proper choice of ligand an
Autor:
Adam S. Veige, Soumya Sarkar, Adam R. Carlson, Khalil A. Abboud, Joseph M. Falkowski, Melanie K. Veige
Publikováno v:
Journal of the American Chemical Society. 130:1116-1117
The new terphenyl pincer precursor 3,3‘ ‘-di-tert-butyl-1,1‘:3‘,1‘ ‘-terphenyl-2,2‘ ‘-diol (1) is examined for its ability to support early transition metals as a trianionic ligand. Metalation proceeds smoothly at −35 °C with Mo(NM
Publikováno v:
Journal of the American Chemical Society. 127:8292-8293
We describe a convergent, enantioselective synthesis of (-)-tetracycline (1) from benzoic acid (17 steps, 1.1% yield). Benzoic acid was transformed into the AB precursor 2 in 10 steps (11% yield), as previously described, and the latter compound was
Autor:
Graham W. Burton, Keith U. Ingold, L. Hughes, L. Prasad, Florence L. Lee, Eric J. Gabe, Takahisa Doba
Publikováno v:
Journal of the American Chemical Society. 107:7053-7065
Rate constants, k1, for H-atom abstraction by peroxyl radicals from α-tocopherol and 35 structurally related phenols have been measured at 30°C by the inhibited autoxidation of styrene (IAS) method. An independent laser-flash kinetic EPR method was