Results 21 to 30 of about 415,539 (315)

Reactivity of TEMPO anion as a nucleophile and its applications for selective transformations of haloalkanes or acyl halides to aldehydes [PDF]

, 2004
Sodium 2,2,6,6-tetramethylpiperidine-N-oxide (TEMPO−Na+), generated by reduction of TEMPO· with sodium naphthalenide in THF, reacted with alkyl halides or acyl halides to produce O-alkylated or acylated TEMPOs, which were in turn oxidized with ...
Allen, Anderson, Boger, Braslau, Braslau, Gilbert, Hawker, Henry-Riyad, Hiroyuki Kawafuchi, Hudlicky, Hunter, Inokuchi, Jahn, Johnstone, Kersey, Kilenyi, Kruse, Matyjaszewski, Nahm, Ollivier, Page, Paquette, Ren, Rossi, Saunders, Schämann, Semmelhack, Sholle, Skene, Studer, Togo, Tsutomu Inokuchi, Uneyama, Wetter, Whitesides, Winterfeldt   +35 more
core   +1 more source

Preparation, Structure, and Reactivity of Nonstabilized Organoiron Compounds. Implications for Iron-Catalyzed Cross Coupling Reactions [PDF]

, 2008
A series of unprecedented organoiron complexes of the formal oxidation states −2, 0, +1, +2, and +3 is presented, which are largely devoid of stabilizing ligands and, in part, also electronically unsaturated (14-, 16-, 17- and 18-electron counts ...
Fürstner, A., Goddard, R., Krause, H., Lehmann, C., Martin, R., Seidel, G.   +5 more
core   +1 more source

An NMR Study of N-isobutyryl-3'-O-(1-fluoro-1,1,3,3-tetraisopropyl-1,3-disiloxane-3-yl)-2'-benzyloxycarbonyl-guanosine

Chinese Journal of Magnetic Resonance, 2019
The nucleoside derivative N-isobutyryl-3'-O-(1-fluoro-1,1,3,3-tetraisopropyl-1,3-disiloxane-3-yl)-2'-benzyloxy carbonyl-guanosine (compound 1) was obtained by selectively cleaving the 1,1,3,3-tetraisopropyldisiloxanyl protecting group at 5'-position with
WEI Hui-qiang, YU Jiang, BI Chang-fen, NING Hong-xin, LI Yi-liang, LIU Qiang   +5 more
doaj   +1 more source

Synthesis of nine safrole derivatives and their antiproliferative activity towards human cancer cells [PDF]

, 2010
Indexación: ScieloSafrole from sassafras oil (Ocoteapretiosa Mez., Lauraceae), is an abundant natural product showing interesting functionality and chemical structure.
Carrasco Altamirano, Héctor, Cuellar Fritis, Mauricio, Espinoza Catalán, Luis, Madrid Villegas, Alejandro, Taborga Liber, Lautaro, Villena García, Joan   +5 more
core   +2 more sources

1H NMR relaxation in urea

Journal of Molecular Structure, 2007
Abstract Proton NMR spin–lattice relaxation times T1 were measured for urea as a function of temperature. An activation energy of 46.3 ± 4.7 kJ/mol was extracted and compared with the range of 38–65 kJ/mol previously reported in the literature as measured by different magnetic resonance techniques.
Taylor, Robert E, Bacher, Alfred D, Dybowski, C.   +2 more
openaire   +3 more sources

Donor-Acceptor Oligorotaxanes Made to Order [PDF]

, 2011
Five donor–acceptor oligorotaxanes made up of dumbbells composed of tetraethylene glycol chains, interspersed with three and five 1,5-dioxynaphthalene units, and terminated by 2,6-diisopropylphenoxy stoppers, have been prepared by the threading of ...
Barin, Gokhan, Basu, Subhadeep, Benítez, Diego, Coskun, Ali, Fahrenbach, Albert C., Friedman, Douglas C., Goddard, William A., III, Olson, Mark A., Stoddart, J. Fraser, Tkatchouk, Ekaterina, Yang, Jeffrey   +10 more
core   +1 more source

Spectral data of nicotabaflavonoidglycoside

Data in Brief, 2018
The dataset addressed in this article relates to the research article entitled“Nicotabaflavonoidglycoside, the first example of cembranoid and flavonoid heterodimer from Nicotiana tabacum” (Yang et al., 2018) [1]. The dataset presents the MS4(879-571-421-
Cai-Yan Yang, Yao Lin, Hui-Xiong Yuan, Wen-Pei Yang, Xian Wei, Zu-Liang Huang   +5 more
doaj   +1 more source

Late stage C―H activation of a privileged scaffold; synthesis of a library of benzodiazepines [PDF]

, 2016
A library of over twenty 5-(2-arylphenyl)-1,3-dihydro-2H-1,4-benzodiazepin-2-ones has been formed by a microwave-mediated late-stage palladium-catalysed arylation of 1,4-benzodiazepines using diaryliodonium salts.
Abdelkafi, Algarra, Baghbanzadeh, Baud, Bedford, Bielawski, Bunin, Chuckowree, Ciana, Clark, Coles, Delvare, Diers, Duncton, Dupont, El Bouakher, Field, Filippakopoulos, Filippakopoulos, Gant, Gribble, He, Ho, Huang, Islam, Kaur, Kozhushkov, Kruegel, Lapointe, Liang, Liegault, Liu, Luo, Lyons, Ma, Ma, McDonald, McDonald, McNally, Merritt, Mirguet, Modha, Mwande-Maguene, Nadin, Nadres, Neufeldt, Noisier, O’Hara, Purser, Ren, Schulman, Sharma, Sharma, Spencer, Spencer, Spencer, Spencer, Sternbach, Trost, Wang, Wencel-Delord, Wu, Yamaguchi, Yang, Yotphan   +64 more
core   +1 more source

Synthesis and characterisation of ferrocenyl-phosphonic and -arsonic [PDF]

, 2001
The ferrocene-derived acids FcCH₂CH₂E(O)(OH)₂ [4, E=P; 10, E=As; Fc=Fe(η₅-C₅H₅)(η⁵-C₅H₄)] have been synthesized by the reaction of FcCH₂CH₂Br with either P(OEt)₃ followed by hydrolysis, or with sodium arsenite followed by acidification.
Alley, Steven R., Henderson, William
core   +2 more sources

Structural Identification and Complete NMR Spectral Assignments of 4-Isopropoxy-1-(trifluoroacetyl)naphthalene

Chinese Journal of Magnetic Resonance
In this paper, one-dimensional (1H NMR, 13C NMR, DEPT, and 19F NMR) and two-dimensional NMR (1H-1H COSY, 1H-13C HMBC, and 1H-13C HSQC) techniques were applied to perform structural identification and NMR spectral assignments of the fluorine-containing ...
ZHENG Jiaqi, WANG Yinong, YUAN Siwen, YIN Tianpeng   +3 more
doaj   +1 more source