The Experts below are selected from a list of 222 Experts worldwide ranked by ideXlab platform
Hideo Kurosawa - One of the best experts on this subject based on the ideXlab platform.
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from mononuclear to multinuclear complexes of palladium containing Unsaturated Hydrocarbon ligands
Journal of Organometallic Chemistry, 2004Co-Authors: Hideo KurosawaAbstract:Abstract This review summarizes the author’s contributions to the field of chemistry of group 10 metal complexes containing Unsaturated Hydrocarbon ligands, with a brief introduction showing how his research subject has shifted from mononuclear type to multinuclear type complexes. New structure and reactivity trends in the multipalladium complexes with bridging allyl and allenyl/propargyl ligands, as well as bridging conjugated polyene molecules are discussed in terms of some unique bonding features of these complexes.
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new direction in organopalladium chemistry structure and reactivity of Unsaturated Hydrocarbon ligands bound to multipalladium units
Chemical Record, 2003Co-Authors: Tetsuro Murahashi, Sensuke Ogoshi, Hideo KurosawaAbstract:Examination of the manner of interaction between Pd(0) and allylpalladium(II) complexes, both being involved as key intermediates in Pd-catalyzed allylic coupling, led us to discover a new role for such combinations in affecting the stereochemistry of the transformations. A similar investigation of the system involving Pd(0) and allenyl/propargyl complexes of Pd(II) led to the discovery of dinuclear Pd(I)Pd(I) complexes containing bridging allenyl/propargyl ligands, which exhibited novel structural and reactivity aspects of great synthetic significance. A systematic comparison was made between the structure, stability, and reactivity of allyl and allenyl/propargyl ligands in dinuclear complexes and those in mononuclear counterparts. On the basis of MO calculations, coordination behavior specific to the ligands of the dinuclear complex is attributed to the occurrence of the back-donating interaction from filled PdPd bonding orbitals to vacant ligand π* orbitals. Similar bonding features are the origin of the ready synthesis of novel one-dimensional sandwich complexes composed of conjugated polyene ligands and linear polypalladium chains. A substitutionally labile dipalladium complex reacts with an equimolar amount of trienes or alkynes to give formal [4π + 2σ] or [2π + 2σ] adducts, respectively, which undergo further unique transformations with additional Unsaturated substrates. © 2003 The Japan Chemical Journal Forum and Wiley Periodicals, Inc., Chem Rec 3: 101–111; 2003: Published online in Wiley InterScience (www.interscience.wiley.com) DOI 10.1002/tcr.10052
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novel coordination behavior of Unsaturated Hydrocarbon ligands on pd pd bonds
Pure and Applied Chemistry, 2001Co-Authors: Hideo Kurosawa, Tetsuro MurahashiAbstract:The dinuclear Pd(I) complexes containing substitutionally labile acetonitrile lig- ands (Pd2(CH3CN)2(L)2)(BF4)2 (L = CH3CN (1), PPh3 (2)) were prepared. The complex 1 was demonstrated to serve as a versatile building block for synthesizing sandwich chain com- plexes made of conjugated polyenes and linear polypalladium chains. The complex 2 react- ed with 2 equiv arylacetylenes to give dinuclear organopalladium complexes arising from formal (2σ + 2π + 2π) addition with the Pd-Pd σ bond participating as one component. The reaction of 2 with 1,3-butadiene afforded a complex regarded as an intermediate lying halfway on the (2σ + 4π) reaction coordinate.
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new transformations of Unsaturated Hydrocarbon ligands coordinated with mono and dinuclear palladium units
Pure and Applied Chemistry, 1998Co-Authors: Hideo KurosawaAbstract:Some insights into mechanistic features of M-C bond formation (oxidative addition) and bond cleavage (reductive elimination) about allyl-palladium complexes are presented based on new transformations of allylic as well as propargylic ligands bound to Pd and Pt. 1) The oxidative addition is proposed to proceed through initial Tc-complex formation between allylic electrophiles and M(0) atom, which is followed by intramolecular $-allyl-M bond formation with either inversion or retention of configuration at an allylic sp3-carbon depending on the nature of ligands and solvents. 2) The reductive elimination of allyl(organo)palladium complexes is suggested to proceed via cis C-C coupling between q3-allyl and 111-bound organic ligands. 3) A Pd(0) nucleophile is shown to exhibit dual selectivity with regard to the site of its attack on allylpalladium complexes depending on the nature of their ligands, leading to either redox transmetallation with net inversion of configuration at the allylic sp3- carbon, or p-ally1 Pd-Pd complex formation with retention of stereochemistry. Some novel bonding and reactivity trends in those Pd-Pd bonded complexes which contain p-allyl, p-propargyl and p-diene ligands are also presented.
Barbara Wiśniewskagoclowska - One of the best experts on this subject based on the ideXlab platform.
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recommended liquid liquid equilibrium data part 2 Unsaturated Hydrocarbon water systems
Journal of Physical and Chemical Reference Data, 2004Co-Authors: Marian Goral, Andrzej Maczynski, Barbara WiśniewskagoclowskaAbstract:The recommended liquid–liquid equilibrium (LLE) data for 24 binary Unsaturated Hydrocarbon–water systems have been obtained after critical evaluation of all data (80 data sets) reported in the open literature up to the middle of 2003. A new equation was developed for prediction of the Unsaturated Hydrocarbon solubility. Using the predicted Hydrocarbon solubilities the concentration of water in the second liquid phase was calculated. The LLE calculations were performed with the equation of state appended with a chemical term (EoSC). The recommended data were presented in the form of individual pages containing tables, all the references, and optionally figures.
Jingping Qu - One of the best experts on this subject based on the ideXlab platform.
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sulfur centered reactivity of oxidized iron thiolate complex toward Unsaturated Hydrocarbon addition
Organometallics, 2018Co-Authors: Yahui Zhang, Dawei Yang, Ying Li, Xiangyu Zhao, Baomin Wang, Jingping QuAbstract:The sulfur-based reactivity of transition-metal thiolate complexes toward alkenes has received extensive attention as a significant proposal for a potential olefin purification scheme. The one-electron oxidation of half-sandwich iron thioether-dithiolate complex [Cp*Fe(η3-tpdt)] (1, Cp* = η5-C5Me5; tpdt = S(CH2CH2S–)2) resulted in the formation of iron-stabilized thiyl radicals, which can interact with Unsaturated Hydrocarbons such as alkenes or alkynes to give the corresponding trithioether-iron adducts. Interestingly, during this transformation process, the formal oxidation state of the iron center changed from +IV to +II, which suggests a two-electron transfer from Unsaturated Hydrocarbons to the iron center. Furthermore, the electrochemical measurements reveal this C–S bond formation is an irreversible process, during which ethylene cannot release under electrochemical reductive conditions. These adducts were unambiguously identified by various spectroscopic and X-ray crystallographic characterizations.
Marian Goral - One of the best experts on this subject based on the ideXlab platform.
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recommended liquid liquid equilibrium data part 2 Unsaturated Hydrocarbon water systems
Journal of Physical and Chemical Reference Data, 2004Co-Authors: Marian Goral, Andrzej Maczynski, Barbara WiśniewskagoclowskaAbstract:The recommended liquid–liquid equilibrium (LLE) data for 24 binary Unsaturated Hydrocarbon–water systems have been obtained after critical evaluation of all data (80 data sets) reported in the open literature up to the middle of 2003. A new equation was developed for prediction of the Unsaturated Hydrocarbon solubility. Using the predicted Hydrocarbon solubilities the concentration of water in the second liquid phase was calculated. The LLE calculations were performed with the equation of state appended with a chemical term (EoSC). The recommended data were presented in the form of individual pages containing tables, all the references, and optionally figures.
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Recommended Liquid–Liquid Equilibrium Data. Part 2. Unsaturated Hydrocarbon–Water Systems
Journal of Physical and Chemical Reference Data, 2004Co-Authors: Marian Goral, Andrzej Maczynski, Barbara Wiśniewska-gocłowskaAbstract:The recommended liquid–liquid equilibrium (LLE) data for 24 binary Unsaturated Hydrocarbon–water systems have been obtained after critical evaluation of all data (80 data sets) reported in the open literature up to the middle of 2003. A new equation was developed for prediction of the Unsaturated Hydrocarbon solubility. Using the predicted Hydrocarbon solubilities the concentration of water in the second liquid phase was calculated. The LLE calculations were performed with the equation of state appended with a chemical term (EoSC). The recommended data were presented in the form of individual pages containing tables, all the references, and optionally figures.
Kazushi Mashima - One of the best experts on this subject based on the ideXlab platform.
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bonding and structural features of metal metal bonded homo and hetero dinuclear complexes supported by Unsaturated Hydrocarbon ligands
Journal of Organometallic Chemistry, 2018Co-Authors: Hayato Tsurugi, Payel Laskar, Keishi Yamamoto, Kazushi MashimaAbstract:Abstract Dinuclear complexes with a metal-metal interaction have been extensively investigated as minimum entities of metal clusters. Hydrocarbon-bridged dinuclear complexes are one of the most important class of the dinuclear complexes for exploring any transformations of the Unsaturated Hydrocarbons at the dinuclear core. In this review, we summarize the dinuclear complexes with metal-metal interaction supported by Unsaturated Hydrocarbons such as alkynes, dienes, and aromatic compounds resulting in 3–6 membered metallacycles, and briefly discuss the structural characteristics based on the different metallacycle structures and coordination mode of the Unsaturated Hydrocarbons in the dinuclear complexes.
