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  • 1.
    Cadu, Alban
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Kemiska sektionen, Institutionen för kemi - BMC, Syntetisk organisk kemi.
    Andersson, Pher G.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Kemiska sektionen, Institutionen för kemi - BMC, Syntetisk organisk kemi.
    Development of iridium-catalyzed asymmetric hydrogenation: New catalysts, new substrate scope2012Ingår i: Journal of Organometallic Chemistry, ISSN 0022-328X, E-ISSN 1872-8561, Vol. 714, s. 3-11Artikel, forskningsöversikt (Refereegranskat)
    Abstract [en]

    A review. The asym. hydrogenation of olefins is a tremendously powerful tool used to synthesize chiral mols. The field was pioneered using rhodium- and ruthenium- based catalysts; however, catalysts based on both of these metals suffer from limitations, such as the need for directing substituents near or even adjacent to the olefin. Iridium-based catalysts do not suffer from this flaw and can thus hydrogenate a wide variety of olefins, including some tetra substituted ones. It is also possible for iridium-based catalysts to hydrogenate hetero-π bonds such as those found in heteroarom. rings. This review summarizes the contributions made to this field by the authors in the past few years. [on SciFinder(R)]

  • 2. Kaiser, N F K
    et al.
    Bremberg, U
    Larhed, M
    Moberg, C
    Hallberg, A
    Microwave-mediated palladium-catalyzed asymmetric allylic alkylation; an example of highly selective fast chemistry2000Ingår i: Journal of Organometallic Chemistry, ISSN 0022-328X, E-ISSN 1872-8561, Vol. 603, nr 1, s. 2-5Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Highly enantioselective palladium-catalyzed microwave-mediated fast chemistry has been performed on dimethyl malonate alkylation of(rac)-1,3-diphenylallyl-1-acetate (1). Utilizing the recently developed palladium-phosphineoxazoline catalytic system, with general stability at elevated temperatures (less than or equal to 145 degrees C), quantitative yields of greater than or equal to 97% and ee values of up to >99% were obtained after very short irradiation times (15-300 s, TOF up to 7000 h(-1)). (C) 2000 Elsevier Science S.A. All rights reserved.

  • 3.
    Saeed, Aamer
    et al.
    Quaid I Azam Univ, Dept Chem, Islamabad 45320, Pakistan..
    Haroon, Mehfooz
    Quaid I Azam Univ, Dept Chem, Islamabad 45320, Pakistan..
    Muhammad, Faisal
    Quaid I Azam Univ, Dept Chem, Islamabad 45320, Pakistan..
    Larik, Fayaz Ali
    Quaid I Azam Univ, Dept Chem, Islamabad 45320, Pakistan..
    Hesham, El-Seedi
    Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Farmaceutiska fakulteten, Institutionen för läkemedelskemi, Avdelningen för farmakognosi.
    Channar, Pervaiz Ali
    Quaid I Azam Univ, Dept Chem, Islamabad 45320, Pakistan..
    Advances in transition-metal-catalyzed synthesis of 3-substituted isocoumarins2017Ingår i: Journal of Organometallic Chemistry, ISSN 0022-328X, E-ISSN 1872-8561, Vol. 834, s. 88-103Artikel, forskningsöversikt (Refereegranskat)
    Abstract [en]

    3-Substituted isocoumarins are the most abundant class of naturally isocoumarins, found in several biologically active scaffolds and are precursors towards complex natural products. Considerable attempts have been devoted to the synthesis of these isocoumarins both by metal free or transition-metalcatalyzed reactions. Among the metal catalyzed reactions, the use of palladium, copper, gold, iron, nickel, rhodium, ruthenium, zinc, chromium, iridium, silver or thallium salts/complexes for the construction of 3-substituted isocoumarin ring is noteworthy due to being economical and good functional group tolerance. The current review focusses the recent reports on the Pd-, Cu-, Ag-, Fe-, Ni-, Rh-, Ru-, Zn, Cr-, Ir-, Ag- and Ti -catalyzed synthesis of isocoumarins.

  • 4. Samec, Joseph S. M.
    et al.
    Keitz, Benjamin K.
    Grubbs, Robert H.
    Latent ruthenium olefin metathesis catalysts featuring a phosphine or an N-heterocyclic carbene ligand.2010Ingår i: Journal of Organometallic Chemistry, ISSN 0022-328X, E-ISSN 1872-8561, Vol. 695, nr 14, s. 1831-1837Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The synthesis and characterization of latent 18-electron ruthenium benzylidene complexes (PCy3)((κN,O)-picolinate)2RuCHPh (5) and (H2IMes)((κN,O)-picolinate)2RuCHPh (6) are described. Both complexes appear as two isomers. The ratio between the isomers is dependent on L-type ligand. The complexes are inactive in ring-closing metathesis and ring-opening metathesis polymn. reactions even at elevated temps. in the absence of stimuli. Upon addn. of HCl, complexes 5 and 6 become highly active in olefin metathesis reactions. The advantage of the latent catalysts is demonstrated in the ring-opening metathesis polymn. of dicyclopentadiene, where the latency of 6 assures adequate mixing of catalyst and monomer before initiation. Trapping expts. suggests that the acid converts the 18-electron complexes into their corresponding highly olefin metathesis active 14-electron benzylidenes. [on SciFinder(R)]

  • 5. Schaffran, Tanja
    et al.
    Lizzel, Franziska
    Samatanga, Brighton
    Karlsson, Göran
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Kemiska sektionen, Institutionen för fysikalisk och analytisk kemi, Fysikalisk kemi.
    Burghardt, Alexander
    Edwards, Katarina
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Kemiska sektionen, Institutionen för fysikalisk och analytisk kemi, Fysikalisk kemi.
    Winterhalter, Mathias
    Peschka-Süss, Regine
    Schubert, Rolf
    Gabel, Detlef
    Dodecaborate cluster lipids with variable headgroups for boron neutron capture therapy: Synthesis, physical-chemical properties and toxicity2009Ingår i: Journal of Organometallic Chemistry, ISSN 0022-328X, E-ISSN 1872-8561, Vol. 694, nr 11, s. 1708-1712Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    We have prepared two new boron-containing lipids with potential use in boron neutron capture therapy of tumors. These lipids consist of a diethanolamine frame with two myristoyl chains bonded as esters, and a butylene or ethyleneoxyethylene unit linking the doubly negatively charged dodecaborate cluster to the amino function of the frame, obtained by nucleophilic attack of the amino on the tetrahydrofurane and dioxane derivatives, respectively, of closo-dodecaborate. The latter cluster lipid can form liposomes at 25 °C whereas the former lipid at this temperature assembles into bilayer disks. Both lipids form stable liposomes when mixed with suitable helper lipids. The thermotropic behavior was found to be different for the two lipids, with the butylene lipid showing sharp melting transitions at surprisingly high temperatures. Toxicity in vitro and in vivo varies greatly, with the butylene derivative being more toxic than the ethyleneoxyethylene derivative.

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