Results 121 to 130 of about 189,010 (320)

Isomer detection on the basis of analyte adduct formation with the components of the mobile phase and tandem mass spectrometry

Arabian Journal of Chemistry, 2019
To investigate and compare the detection of isomers on the basis of analyte adduct formation with the components of the mobile phase appropriate infusion experiments were performed with tandem mass spectrometry (−Q1 MS, −EPI and −MRM mode) and analyses ...
Marek Dziadosz
doaj  

Diastereoselective synthesis of β- and γ2-muurolene. A carbocationic pathway from mono- to sesquiterpenes [PDF]

, 1988
The Lewis acid catalysed addition of the piperityl chlorides 6 to isoprene yields adduct 7, which undergoes a cis-stereoselective cyclisation to give the diastereoisomeric muurolene monohydrochlorides 8.
Azizur-Rahman, , Burk, Burkert, Gray, Gregson, Herbert Klein, Herbert Mayr, Johnson, Johnson, Ju¨rgen Dressel, Karrer, Krasutsky, Köster, Mayr, Mayr, Mayr, Mayr, Mayr, Mayr, Mayr, Mayr, Mayr, Sakurai, Soffer, Sutherland   +24 more
core   +1 more source

Double‐Sided Control of Product Type Preference in the Visible‐Light Initiated Reaction of 1,3‐Dicarbonyl Compounds with Alkenes

Advanced Synthesis &Catalysis, EarlyView.
Abstract The demonstrated light‐initiated addition of radicals formed on an active methylene group to styrene derivatives exhibits a product selectivity influenced by the presence of a protic solvent. Under protic conditions, the predominant products are branched compounds with the alkene moiety attached to the methylene group.
Małgorzata Pałyga, Jan Rzepiela, Sebastian Baś   +2 more
wiley   +1 more source

Molecular structure of cyclo-octatetraene dimers. I. The 1:1 silver nitrate adduct of the dimer which melts at 38.5°C [PDF]

, 1959
S. C. Nyburg, J. Hilton
openalex   +1 more source

Step-Wise Computational Synthesis of Fullerene C60 derivatives. 1.Fluorinated Fullerenes C60F2k

, 2009
The reactions of fullerene C60 with atomic fluorine have been studied by unrestricted broken spin-symmetry Hartree-Fock (UBS HF) approach implemented in semiempirical codes based on AM1 technique. The calculations were focused on a sequential addition of
A. A. Gakh, A. A. Gakh, A. A. Gakh, A. A. Gakh, A. A. Popov, A. Szabo, B. W. Clare, B. W. Clare, B. W. Clare, B. W. Clare, B. W. Clare, D. A. Zhogolev, E. F. Sheka, E. F. Sheka, E. F. Sheka, E. F. Sheka, E. F. Sheka, E. F. Sheka, E. F. Sheka, E. F. Sheka, E. F. Sheka, E. F. Sheka, E. F. Sheka, E. R. Davidson, F. N. Tomilin, H. Zabrodsky, I. Kaplan, I. S. Neretin, J. A. Pople, J. H. Holloway, J. Hachmann, K. B. Wiberg, K. Balasubramania, K. Hedberg, K. Takatsuka, L. G. Bulusheva, L. Hedberg, L. Noodleman, N. Matsuzawa, O. V. Boltalina, O. V. Boltalina, P. J. Krusic, P. K. Berzigiyarov, R. J. Papoular, R. L. Jaffe, R. Mitsumoto, R. Taylor, R. Taylor, S. Dutta, S. G. Semenov, S. Grimme, S. I. Troyanov, S. Kawasaki, U. Barth von, V. N. Staroverov   +54 more
core   +1 more source

Tunable Preparation of β‐Substituted Alkenoate Esters via Radical Alkenylation of C(sp3)–H Bonds with Allenoates

Advanced Synthesis &Catalysis, EarlyView.
Abstract A photocatalytic strategy for the radical alkenylation of aliphatic C(sp3)–H bonds with 2,3‐allenoate esters is described. The protocol takes place upon irradiation of the reaction mixture in the presence of the decatungstate anion, which triggers C−H cleavage in the chosen aliphatic substrates.
Alexandra Jorea, Roberto Chessa, Davide Ravelli   +2 more
wiley   +1 more source

Selective formation of a zwitterion adduct and bicarbonate salt in the efficient CO2 fixation by N-benzyl cyclic guanidine under dry and wet conditions

Beilstein Journal of Organic Chemistry, 2018
The efficient CO2 fixation by N-benzyl cyclic guanidine 1 was achieved by bubbling dry CO2 through CH3CN at 25 °C for 2 h. In addition, the zwitterion adduct 2 and bicarbonate salt 3 were selectively prepared from 1 under dry (in anhydrous CH3CN) and wet
Yoshiaki Yoshida, Naoto Aoyagi, Takeshi Endo   +2 more
doaj   +1 more source

Urea Adducts of Glyceryl Esters [PDF]

, 1956
F. Aylward, P D Wood
openalex   +1 more source

Asymmetric Synthesis of Highly Substituted Spiro[2H‐pyrrole‐2,3‐Succinimide] Derivatives by Copper‐Catalyzed Post‐Ugi Reactions

Advanced Synthesis &Catalysis, EarlyView.
Abstract Herein we present a novel one‐pot methodology for the synthesis of enantioenriched 2H‐pyrrolespirosuccinimides by copper‐catalyzed reactions on Ugi adducts derived from enantiopure α‐alkylbenzyl amines through a chirality transfer process. We have proposed a mechanism, supported by density functional theory (DFT) calculations, where a hydrogen
Javier Gómez‐Ayuso, Israel Carreira‐Barral, Roberto Quesada, María García‐Valverde   +3 more
wiley   +1 more source

On the Nature of the Red Adduct of Styrene with Sodium [PDF]

, 1958
Kôzô Hirota, Keiji Kuwata, Kazuo Morigaki   +2 more
openalex   +1 more source