@article {2510, title = {The Engineering of Bacteria Bearing Azido-Pseudaminic Acid-Modified Flagella}, journal = {Chembiochem}, volume = {10}, number = {8}, year = {2009}, note = {ISI Document Delivery No.: 452SMTimes Cited: 3Cited Reference Count: 24Liu, Feng Aubry, Annie J. Schoenhofen, Ian C. Logan, Susan M. Tanner, Martin E.}, month = {May}, pages = {1317-1320}, type = {Article}, keywords = {4, 6-DEHYDRATASE, azides, biosynthesis, C. jejuni, CAMPYLOBACTER-JEJUNI, cell surfaces, flagella, FUNCTIONAL-CHARACTERIZATION, HELICOBACTER-PYLORI, IDENTIFICATION, METABOLISM, PATHWAY, PROTEINS, PseB, reaction, Staudinger, UDP-N-ACETYLGLUCOSAMINE}, isbn = {1439-4227}, url = {://000266561500009}, author = {Liu, F. and Aubry, A. J. and Schoenhofen, I. C. and Logan, S. M. and Tanner, M. E.} } @article {2354, title = {Toward the first study of chemical reaction dynamics of Mu with vibrational-state-selected reactants in the gas phase: The Mu + H-2*(v=1) reaction by stimulated Raman pumping}, journal = {Physica B-Condensed Matter}, volume = {404}, number = {5-7}, year = {2009}, note = {ISI Document Delivery No.: 437ESTimes Cited: 1Cited Reference Count: 9Bakule, Pavel Sukhorukov, Oleksandr Matsuda, Yasuyuki Pratt, Francis Gumplinger, Peter Momose, Takamasa Torikai, Eiko Fleming, Donald11th International Conference on Muon Spin Rotation, Relaxation and ResonanceJUL 21-25, 2008Tsukuba, JAPANJapan World Exposit, Commemorat Organizat}, month = {Apr}, pages = {1013-1016}, type = {Proceedings Paper}, abstract = {Stimulated Raman pumping (SRP) is used to produce H-2 in its first vibrational state, in order to measure, for the first time, the Mu + H-2*(v = 1) -> MuH + H reaction rate at room temperature, as a prototypical example of new directions in gas-phase muonium chemistry, utilizing the pulsed muon beam and a new dedicated laser system at the RIKEN/RAL Laboratory. Reported here is a preliminary result but the final results are expected to provide definitive new tests of reaction rate theory on the highly accurate H-3 potential energy surface. The major difficulty in this experiment, compared to the standard SRP process, is to ensure a homogeneous excitation over a volume of several cm(3) and of sufficient intensity to ensure a measurable Mu relaxation rate. The techniques used to accomplish this are described. The experiment utilizes the 2nd harmonic output of a Nd:YAG laser (532 nm) with pulse energies up to 500 mJ at a repetition rate of 25 Hz. Different optical setups have been constructed and tested in order to optimize the number of laser-pumped H-2 molecules and their overlap with the stopping profile of the muon beam in the reaction cell (total volume similar to 100 x 40 x 4 mm(3)). The first result of this experiment gives a measured relaxation rate due to laser excitation of lambda* = 0.085 +/- 0.051 mu s(-1), consistent with theory but limited by both low statistics and particularly a high background relaxation rate. (c) 2009 Elsevier B.V. All rights reserved.}, keywords = {DYNAMICS, HYDROGEN, Laser setups, muonium, reaction, Stimulated Raman pumping}, isbn = {0921-4526}, url = {://000265469800122}, author = {Bakule, P. and Sukhorukov, O. and Matsuda, Y. and Pratt, F. and Gumplinger, P. and Momose, T. and Torikai, E. and Fleming, Donald G.} } @article {1075, title = {Photochemistry of 9-methylbicyclo[3.3.1]nonyl aryl ketones - A novel 1,5-disproportionation of 1,4-hydroxy biradicals and asymmetric induction using the solid-state ionic chiral auxiliary method}, journal = {Canadian Journal of Chemistry-Revue Canadienne De Chimie}, volume = {83}, number = {9}, year = {2005}, note = {ISI Document Delivery No.: 001VETimes Cited: 4Cited Reference Count: 29}, month = {Sep}, pages = {1460-1472}, type = {Article}, abstract = {A novel 1.5-disproportionation reaction has been discovered for 1,4-hydroxy biradicals derived from the photolysis of 9-methylbicyclo[3.3.1]nonyl phenyl ketones (1), which undergo mainly Yang cyclization both in Solution and the solid state. By applying the solid-state ionic chiral auxiliary method of asymmetric synthesis to the Yang cyclization, enantiomeric excesses as high as 95\% were achieved at high reaction conversions. The origin of the reaction selectivity is discussed with the help of X-ray crystallography. In addition, the solid-state photoreaction of ketone 1b was found to occur in a single crystal-to-single crystal fashion.}, keywords = {1, 4-hydroxy biradical, asymmetric, BEHAVIOR, CRYSTAL-STRUCTURE, disproportionation, HYDROGEN-BOND, INDUCTION, ionic chiral auxiliary, PHOTOCHEMISTRY, PHOTOCYCLIZATION, reaction, REACTIVITY CORRELATIONS, SALTS, single crystal-to-single crystal}, isbn = {0008-4042}, url = {://000234570000030}, author = {Chen, S. and Patrick, B. O. and Scheffer, J. R.} } @article {612, title = {A formal construction of fasicularin}, journal = {Organic Letters}, volume = {5}, number = {23}, year = {2003}, note = {ISI Document Delivery No.: 741QDTimes Cited: 23Cited Reference Count: 42}, month = {Nov}, pages = {4313-4316}, type = {Article}, abstract = {Our synthetic approach toward fasicularin is presented. Key steps in this construction are a siloxy-epoxide semipinacol rearrangement, a B-alkyl Suzuki reaction and an intramolecular S(N)2 reaction.}, keywords = {(+/-)-LEPADIFORMINE, CROSS-COUPLING, CYLINDRICINE, DIELS-ALDER REACTION, DIPOLAR CYCLOADDITION, ENANTIOMER, KETONES, MARINE ALKALOID LEPADIFORMINE, NATURAL, reaction, REARRANGEMENT, STEREOSELECTIVE CONSTRUCTION}, isbn = {1523-7060}, url = {://000186468000019}, author = {Fenster, M. D. B. and Dake, G. R.} } @article {710, title = {Preorganization of achiral molecules for asymmetric synthesis through crystallization-induced immobilization in homochiral conformations}, journal = {Angewandte Chemie-International Edition}, volume = {42}, number = {32}, year = {2003}, note = {ISI Document Delivery No.: 716PRTimes Cited: 19Cited Reference Count: 24}, pages = {3775-3777}, type = {Article}, keywords = {asymmetric synthesis, CRYSTAL, crystal engineering, GEOMETRIC REQUIREMENTS, II, INDUCTION, KETONES, PHOTOCHEMICAL-REACTIONS, PHOTOCHEMISTRY, PHOTOCYCLIZATION, reaction, REACTIONS, REACTIVITY, SOLID-STATE, topochemistry}, isbn = {1433-7851}, url = {://000185038000009}, author = {Patrick, B. O. and Scheffer, J. R. and Scott, C.} } @article {5040, title = {A combined linear ion trap time-of-flight system with improved performance and MSn capabilities}, journal = {Rapid Communications in Mass Spectrometry}, volume = {15}, number = {19}, year = {2001}, note = {ISI Document Delivery No.: 477JFTimes Cited: 47Cited Reference Count: 28}, pages = {1777-1795}, type = {Article}, abstract = {A detailed description of a linear ion trap time-of-flight (TOF) mass spectrometer system, capable of sequential mass spectrometry (MS{\textquoteright}), is given. Many improvements have been incorporated since the initial description of this system (Rapid Commun. Mass Spectrom. 1998; 12:1463-1474). The pressure in the trap has been lowered from 7.0 to 1.8 mTorr, resulting in an increase in the mass resolution of ion excitation from 75 to 240. Use of the system for MS3 is demonstrated. Dipole excitation of the n = I harmonic, instead of the n = 0 fundamental frequency of ion motion, is shown to have a higher frequency resolution, f/Deltaf, but lower mass resolution, m/Deltam. Both experiments and modeling demonstrate that at the lower pressure there is less collisional cooling of ions in the axial and radial directions of the trap. The efficiency of trapping is shown to be nearly 100\% for periods up to 5 s. The demonstrated mass range for mass analysis has been extended to greater than m/z 16 250. To avoid the formation of adduct ions when trapping protein ions for extended times requires ultra-high vacuum cleanliness conditions, even though the trap operates in the mTorr-pressure range. Upgrading the TOF to a reflectron with higher quality ion optics results in an increase in the mass resolution of the TOF mass spectrometer to about 5000 at m/z 750. Copyright (C) 2001 John Wiley \& Sons, Ltd.}, keywords = {COLLISION CELL, EXCITATION, GUIDE, INTERFACE, MOLECULE, QUADRUPOLE MASS-SPECTROMETER, reaction, STORAGE ASSISTED DISSOCIATION}, isbn = {0951-4198}, url = {://000171279800001}, author = {Collings, B. A. and Campbell, J. M. and Mao, D. M. and Douglas, D. J.} } @article {4227, title = {Stability of a highly charged noncovalent complex in the gas phase: Holomyoglobin}, journal = {Rapid Communications in Mass Spectrometry}, volume = {12}, number = {15}, year = {1998}, note = {ISI Document Delivery No.: 105GATimes Cited: 33Cited Reference Count: 56}, pages = {1003-1010}, type = {Article}, abstract = {Gas phase holomyoglobin (hMb) ions in charge states +7 to +21 were formed by electrospray ionization in combination with a continuous-flow mixing apparatus. Collision cross section measurements show that the highly charged ions are somewhat unfolded in comparison to low charge states but still retain a considerable degree of folding. A new collision model is presented which calculates the relative energies transferred to complexes in tandem mass spectrometry. Tandem mass spectrometry and ion trapping experiments both show that the energies required to dissociate heme from the highly charged heme-protein complexes in the gas phase are similar to those of low charge states, previously shown in literature ion cyclotron resonance experiments to be 0.7-1.0 eV, These energies are comparable to those of the heme binding energy in solution. The results suggest that even for the highly charged hMb ions which have unfolded somewhat, the heme-protein interactions remain relatively unperturbed. (C) 1998 John Wiley \& Sons, Ltd.}, keywords = {CONFORMATION, CYTOCHROME-C, ELECTROSPRAY-IONIZATION, ion-molecule, IONIZATION MASS-SPECTROMETRY, METMYOGLOBIN, MYOGLOBIN, PROTEIN IONS, PROTON-TRANSFER REACTIVITY, QUADRUPOLE, reaction}, isbn = {0951-4198}, url = {://000075063300003}, author = {Chen, Y. L. and Campbell, J. M. and Collings, B. A. and Konermann, L. and Douglas, D. J.} } @article {3642, title = {Reaction of methanol with perfluorotetracyclobuta-1,3,5,7-cyclooctatetraene}, journal = {Journal of Fluorine Chemistry}, volume = {76}, number = {2}, year = {1996}, note = {ISI Document Delivery No.: UA116Times Cited: 4Cited Reference Count: 13}, month = {Feb}, pages = {121-124}, type = {Article}, abstract = {Perfluorotetracyclobuteno-1,3,5,7-cyclooctatetraene (PCOT) is a planar and centrosymmetric molecule which possesses an extraordinary electron affinity due to the planarity of the eight pi-electron system and the cumulative electron-withdrawing effects of the 16 fluorine atoms. An improved method for the synthesis of PCOT and the product resulting from the spontaneous reaction of PCOT with excess alcohol is reported. Crystal structures of the methyl (1) and ethyl (2) derivatives are described.}, keywords = {CRYSTAL, IR spectroscopy, MASS SPECTROMETRY, METHANOL, NMR spectroscopy, perfluorotetracyclobutacyclo-octatetraene, reaction, STRUCTURE}, isbn = {0022-1139}, url = {://A1996UA11600002}, author = {Cullen, W. R. and Rettig, S. J. and Moore, A. E. and Soulen, R. L.} }