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Showing 1 to 12 of 138 entries
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[Problem of the quality of radiological pictures].

Polski przeglad radiologii i medycyny nuklearnej

Gladysz B.
PMID: 5976724
Pol Przegl Radiol Med Nukl. 1966 Sep-Oct;30(5):561-5.

No abstract available.

Activation of Single-Component Nickel(II) Polyethylene Catalysts via Phase Transfer of Fluorous Phosphine Ligands.

Journal of the American Chemical Society

Xi Z, Bazzi HS, Gladysz JA.
PMID: 26300472
J Am Chem Soc. 2015 Sep 02;137(34):10930-3. doi: 10.1021/jacs.5b06562. Epub 2015 Aug 24.

The nickel salicylaldiminato phosphine complexes [1,2,3-C6H3(9-anthracenyl)O(CH═N(2,6-C6H3(iPr)2)]Ni(Me)[P(4-C6H4R)3] (4; R = a, (CH2)2Rf8; b, (CH2)3Rf8; c, H (Rf8 = (CF2)7CF3)) are prepared from the corresponding phosphines 3a-c and nickel NCMe adduct (46-68%). These are applied as catalysts for ethylene polymerization in...

Octahedral Gyroscope-like Molecules Consisting of Rhenium Rotators within Cage-like Dibridgehead Diphosphine Stators: Syntheses, Substitution Reactions, Structures, and Dynamic Properties.

Inorganic chemistry

Hess GD, Fiedler T, Hampel F, Gladysz JA.
PMID: 28598610
Inorg Chem. 2017 Jul 03;56(13):7454-7469. doi: 10.1021/acs.inorgchem.7b00909. Epub 2017 Jun 09.

Reactions of Re(CO)

A Search for pi/sigma Equilibria in Chiral Rhenium Imine Complexes of the Formula [(eta(5)-C(5)H(5))Re(NO)(PPh(3))(N(H)=C(CF(3))X)](+)TfO(-): Investigation of Electronic Effects upon the Binding Mode.

Inorganic chemistry

Stark GA, Gladysz JA.
PMID: 11666738
Inorg Chem. 1996 Sep 11;35(19):5509-5513. doi: 10.1021/ic960302v.

Reaction of the amido complex (eta(5)-C(5)H(5))Re(NO)(PPh(3))(&Numl;H(2)) (2) and hexafluoroacetone gives the methyleneamido complex (eta(5)-C(5)H(5))Re(NO)(PPh(3))(&Numl;=C(CF(3))(2)) (3, 58%). Addition of TfOH to 3 yields the sigma-imine complex [(eta(5)-C(5)H(5))Re(NO)(PPh(3))(eta(1)-N(H)=C(CF(3))(2))](+)TfO(-) (4, 96%). Similar reactions of 2 with trifluoroacetaldehyde and then TfOH give the...

Vibrational progressions in the valence ionizations of transition metal hydrides: evaluation of metal-hydride bonding and vibrations in (eta(5)-C(5)R(5))Re(NO)(CO)H [R = H, CH(3)].

Journal of the American Chemical Society

Lichtenberger DL, Gruhn NE, Rai-Chaudhuri A, Renshaw SK, Gladysz JA, Jiao H, Seyler J, Igau A.
PMID: 11841310
J Am Chem Soc. 2002 Feb 20;124(7):1417-23. doi: 10.1021/ja0120227.

The first examples of vibrational structure in metal-ligand sigma-bond ionizations are observed in the gas-phase photoelectron spectra of CpRe(NO)(CO)H and CpRe(NO)(CO)H [Cp = eta(5)-C(5)H(5), Cp = eta(5)-C(5)(CH(3))(5)]. The vibrational progressions are due to the Re-H stretch in the ion...

How to insulate a reactive site from a perfluoroalkyl group: photoelectron spectroscopy, calorimetric, and computational studies of long-range electronic effects in fluorous phosphines P((CH(2))(m)(CF(2))(7)CF(3))(3).

Journal of the American Chemical Society

Jiao H, Le Stang S, Soós T, Meier R, Kowski K, Rademacher P, Jafarpour L, Hamard JB, Nolan SP, Gladysz JA.
PMID: 11841323
J Am Chem Soc. 2002 Feb 20;124(7):1516-23. doi: 10.1021/ja011877g.

This study advances strategy and design in catalysts and reagents for fluorous and supercritical CO(2) chemistry by defining the structural requirements for insulating a typical active site from a perfluoroalkyl segment. The vertical ionization potentials of the phosphines P((CH(2))(m)R(f8))(3)...

Fluorous catalysis without fluorous solvents: a friendlier catalyst recovery/recycling protocol based upon thermomorphic properties and liquid/solid phase separation.

Journal of the American Chemical Society

Wende M, Meier R, Gladysz JA.
PMID: 11707132
J Am Chem Soc. 2001 Nov 21;123(46):11490-1. doi: 10.1021/ja011444d.

No abstract available.

A new family of chelating diphosphines with a transition metal stereocenter in the backbone: novel applications of "chiral-at-rhenium" complexes in rhodium-catalyzed enantioselective alkene hydrogenations.

Chemistry (Weinheim an der Bergstrasse, Germany)

Kromm K, Zwick BD, Meyer O, Hampel F, Gladysz JA.
PMID: 11405481
Chemistry. 2001 May 04;7(9):2015-27. doi: 10.1002/1521-3765(20010504)7:9<2015::aid-chem2015>3.0.co;2-h.

The title compounds are accessed by sequences starting with racemic and enantiomerically pure [(eta5-C5H5)Re(NO)(PPh3)(CH3)]. Reactions with chlorobenzene/HBF4, PPh2H, and tBuOK give the phosphido complex [(eta5-C5H5)Re(NO)(PPh3)(PPh2)] (3). Reactions with Ph3C+ BF4-, PPh2H, and tBuOK give the methylene homologue [(eta5-C5H5)Re(NO)(PPh3)(CH2PPh2)] (9)....

Synthesis, structure, and reactivity of sp carbon chains with bis(phosphine) pentafluorophenylplatinum endgroups: butadiynediyl (C4) through hexadecaoctaynediyl (C16) bridges, and beyond.

Chemistry (Weinheim an der Bergstrasse, Germany)

Mohr W, Stahl J, Hampel F, Gladysz JA.
PMID: 12866077
Chemistry. 2003 Jul 21;9(14):3324-40. doi: 10.1002/chem.200204741.

The reaction of trans-[(C(6)F(5))(p-tol(3)P)(2)PtCl] (PtCl) and butadiyne (cat. CuI, HNEt(2)) gives trans-[(C(6)F(5))(p-tol(3)P)(2)Pt(Ctbond;C)(2)H] (PtC(4)H, 81 %), which reacts with excess HC(triple bond)CSiEt(3) under Hay coupling conditions (O(2), cat. CuCl/TMEDA, acetone) to yield PtC(6)Si (53 %). A solution of PtC(6)Si in...

Synthesis, structure, and reactivity of palladacycles that contain a chiral rhenium fragment in the backbone: New cyclometalation and catalyst design strategies.

Chemistry (Weinheim an der Bergstrasse, Germany)

Friedlein FK, Kromm K, Hampel F, Gladysz JA.
PMID: 16628761
Chemistry. 2006 Jul 05;12(20):5267-81. doi: 10.1002/chem.200501540.

The bromocyclopentadienyl complex [(eta5-C5H4Br)Re(CO)3] is converted to racemic [(eta5-C5H4Br)Re(NO)(PPh3)(CH2PPh2)] (1 b) similarly to a published sequence for cyclopentadienyl analogues. Treatment of enantiopure (S)-[(eta5-C5H5)Re(NO)(PPh3)(CH3)] with nBuLi and I2 gives (S)-[(eta5-C5H4I)Re(NO)(PPh3)(CH3)] ((S)-6 c; 84 %), which is converted (Ph3C+ PF6 -,...

Fainter and closer: finding planets by symmetry breaking.

Optics express

Ribak EN, Gladysz S.
PMID: 18825194
Opt Express. 2008 Sep 29;16(20):15553-62. doi: 10.1364/oe.16.015553.

Imaging of planets is very difficult, due to the glare from their nearby, much brighter suns. Static and slowly-evolving aberrations are the limiting factors, even after application of adaptive optics. The residual speckle pattern is highly symmetrical due to...

Electronic structure and chain-length effects in diplatinum polyynediyl complexes trans,trans-[(X)(R3P)2Pt(C triple bond C)(n)Pt(PR3)2(X)]: a computational investigation.

Chemistry (Weinheim an der Bergstrasse, Germany)

Zhuravlev F, Gladysz JA.
PMID: 15540262
Chemistry. 2004 Dec 03;10(24):6510-22. doi: 10.1002/chem.200400643.

Structure and bonding in the title complexes are studied using model compounds trans,trans-[(C6H5)(H3P)2Pt(C triple bond C)(n)Pt(PH3)2(C6H5)] (PtCxPt; x = 2n = 4-26) at the B3LYP/LACVP* level of density functional theory. Conformations in which the platinum square planes are parallel...

Showing 1 to 12 of 138 entries