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Showing 1 to 12 of 160 entries
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A One-Pot Assembly of Fully Substituted Alkyl 5-Aminothiophene-2-carboxylates from Allenes, Isothiocyanates, and Alkyl 2-Bromoacetates.

The Journal of organic chemistry

Nedolya NA, Tarasova OA, Albanov AI, Trofimov BA.
PMID: 28636379
J Org Chem. 2017 Jul 21;82(14):7519-7528. doi: 10.1021/acs.joc.7b01217. Epub 2017 Jul 05.

A novel simple approach to highly functionalized multisubstituted thiophenes such as alkyl 4-alkoxy-5-amino-3-methylthiophene-2-carboxylates through the one-pot sequential reaction of α-lithiated alkoxyallenes with isothiocyanates and alkyl 2-bromoacetates has been discovered. The process proceeds quickly (30-45 min) via in situ formation...

Ionization of pyridine: Interplay of orbital relaxation and electron correlation.

The Journal of chemical physics

Trofimov AB, Holland DMP, Powis I, Menzies RC, Potts AW, Karlsson L, Gromov EV, Badsyuk IL, Schirmer J.
PMID: 28668050
J Chem Phys. 2017 Jun 28;146(24):244307. doi: 10.1063/1.4986405.

The valence shell ionization spectrum of pyridine was studied using the third-order algebraic-diagrammatic construction approximation scheme for the one-particle Green's function and the outer-valence Green's function method. The results were used to interpret angle resolved photoelectron spectra recorded with...

Decorated Cyclopentadienes from Acetylene and Ketones in Just Two Steps.

Organic letters

Schmidt EY, Bidusenko IA, Ushakov IA, Vashchenko AV, Trofimov BA.
PMID: 28548856
Org Lett. 2017 Jun 16;19(12):3127-3130. doi: 10.1021/acs.orglett.7b01254. Epub 2017 May 26.

The products of the one-pot assembly of acetylene and ketones in the KOH/DMSO system, 7-methylene-6,8-dioxabicyclo[3.2.1]octanes, undergo an acid-catalyzed (CF

An effective method for substance detection using the broad spectrum THz signal with a "terahertz nose".

Sensors (Basel, Switzerland)

Trofimov VA, Varentsova SA.
PMID: 26020281
Sensors (Basel). 2015 May 25;15(6):12103-32. doi: 10.3390/s150612103.

We propose an effective method for the detection and identification of dangerous substances by using the broadband THz pulse. This pulse excites, for example, many vibrational or rotational energy levels of molecules simultaneously. By analyzing the time-dependent spectrum of...

SU-E-T-552: Maximizing the Biological Effect of Proton Dose Delivered with Scanned Beam.

Medical physics

Zeng C, Giantsoudi D, Grassberger C, Goldberg S, Niemierko A, Paganetti H, Trofimov A.
PMID: 28518512
Med Phys. 2012 Jun;39(6):3832. doi: 10.1118/1.4735641.

PURPOSE: Biological effect of radiation can be enhanced with hypofractionation, localized dose escalation, and controlled distribution of proton's linear energy transfer (LET). We evaluate potential gain in therapeutic effect from delivery of daily inhomogeneous fractional dose distributions in pencil...

Photochemical versus thermal skeletal inversion: viscosity-controlled photodenitrogenation of a bridgehead-substituted DBH-type azoalkane and thermal syn-to-anti housane isomerization.

Journal of the American Chemical Society

Adam W, Diedering M, Trofimov AV.
PMID: 11996583
J Am Chem Soc. 2002 May 15;124(19):5427-30. doi: 10.1021/ja025679g.

Upon photochemical nitrogen extrusion, azoalkane 1b yields the diastereomeric housane products syn-2b (inversion) and anti-2b (retention), whose syn-to-anti isomerization (k(iso)) is observable already at room temperature. From the similar viscosity dependence of the k(inv)/k(ret) data for the photolysis of...

Theoretical study of excitations in furan: spectra and molecular dynamics.

The Journal of chemical physics

Gromov EV, Trofimov AB, Vitkovskaya NM, Köppel H, Schirmer J, Meyer HD, Cederbaum LS.
PMID: 15332889
J Chem Phys. 2004 Sep 08;121(10):4585-98. doi: 10.1063/1.1780160.

The excitation spectra and molecular dynamics of furan associated with its low-lying excited singlet states 1A2(3s), 1B2(V), 1A1(V'), and 1B1(3p) are investigated using an ab initio quantum-dynamical approach. The ab initio results of our previous work [J. Chem. Phys....

Molecular ionization energies and ground- and ionic-state properties using a non-Dyson electron propagator approach.

The Journal of chemical physics

Trofimov AB, Schirmer J.
PMID: 16238382
J Chem Phys. 2005 Oct 08;123(14):144115. doi: 10.1063/1.2047550.

An earlier proposed propagator method for the treatment of molecular ionization is tested in first applications. The method referred to as the non-Dyson third-order algebraic-diagrammatic construction [nD-ADC(3)] approximation for the electron propagator represents a computationally promising alternative to the...

Measurement of the negative muon anomalous magnetic moment to 0.7 ppm.

Physical review letters

Bennett GW, Bousquet B, Brown HN, Bunce G, Carey RM, Cushman P, Danby GT, Debevec PT, Deile M, Deng H, Dhawan SK, Druzhinin VP, Duong L, Farley FJ, Fedotovich GV, Gray FE, Grigoriev D, Grosse-Perdekamp M, Grossmann A, Hare MF, Hertzog DW, Huang X, Hughes VW, Iwasaki M, Jungmann K, Kawall D, Khazin BI, Krienen F, Kronkvist I, Lam A, Larsen R, Lee YY, Logashenko I, McNabb R, Meng W, Miller JP, Morse WM, Nikas D, Onderwater CJ, Orlov Y, Ozben CS, Paley JM, Peng Q, Polly CC, Pretz J, Prigl R, Zu Putlitz G, Qian T, Redin SI, Rind O, Roberts BL, Ryskulov N, Semertzidis YK, Shagin P, Shatunov YM, Sichtermann EP, Solodov E, Sossong M, Sulak LR, Trofimov A, von Walter P, Yamamoto A.
PMID: 15169217
Phys Rev Lett. 2004 Apr 23;92(16):161802. doi: 10.1103/PhysRevLett.92.161802. Epub 2004 Apr 23.

The anomalous magnetic moment of the negative muon has been measured to a precision of 0.7 ppm (ppm) at the Brookhaven Alternating Gradient Synchrotron. This result is based on data collected in 2001, and is over an order of...

Synthesis and optical properties of 2-(benzo[b]thiophene-3-yl)pyrroles and a new BODIPY fluorophore (BODIPY = 4,4-difluoro-4-bora-3a,4a-diaza-s-indacene).

Chemistry (Weinheim an der Bergstrasse, Germany)

Schmidt EY, Trofimov BA, Mikhaleva AI, Zorina NV, Protzuk NI, Petrushenko KB, Ushakov IA, Dvorko MY, Méallet-Renault R, Clavier G, Vu TT, Tran HT, Pansu RB.
PMID: 19396897
Chemistry. 2009 Jun 02;15(23):5823-30. doi: 10.1002/chem.200802467.

2-(Benzo[b]thiophene-3-yl)-1-vinylpyrrole has been synthesized directly from 3-acetylbenzo[b]thiophene oxime and acetylene (flow system, KOH-DMSO, 120 degrees C, 5 h) in 68% yield. Devinylation of the synthesized pyrrole (Hg(OAc)(2), NaBH(4), 50 degrees C) led to the corresponding 2-(benzo[b]thiophene-3-yl)pyrrole in 63% yield....

Dynamics of optical matter creation and annihilation in colloidal liquids controlled by laser trapping power.

Optics letters

Liu J, Dai QF, Huang XG, Wu LJ, Guo Q, Hu W, Yang XB, Lan S, Gopal AV, Trofimov VA.
PMID: 19015686
Opt Lett. 2008 Nov 15;33(22):2617-9. doi: 10.1364/ol.33.002617.

We investigate the dynamics of optical matter creation and annihilation in a colloidal liquid that was employed to construct an all-optical switch. It is revealed that the switching-on process can be characterized by the Fermi-Dirac distribution function, while the...

Sila morita-Baylis-Hillman reaction of cyclopropenes.

Journal of the American Chemical Society

Chuprakov S, Malyshev DA, Trofimov A, Gevorgyan V.
PMID: 17997559
J Am Chem Soc. 2007 Dec 05;129(48):14868-9. doi: 10.1021/ja077437s. Epub 2007 Nov 13.

The first example of sila-Morita-Bayis-Hillman reaction between 1-silylcyclopropenes and carbonyl compounds has been demonstrated. This novel phosphine-catalyzed transformation features a 1,3-Brook rearrangement/elimination cascade and provides convenient access to a variety of 1-(silyloxymethyl)cyclopropenes, which are not easily available via traditional...

Showing 1 to 12 of 160 entries