The Experts below are selected from a list of 114 Experts worldwide ranked by ideXlab platform
W. T. Tsang - One of the best experts on this subject based on the ideXlab platform.
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Semi‐insulating InP grown by chemical beam epitaxy with Pentacarbonyliron doping
Applied Physics Letters, 1995Co-Authors: J D Walker, W. T. TsangAbstract:We present semi‐insulating iron‐doped InP grown by chemical beam epitaxy using the gaseous source Pentacarbonyliron, Fe(CO)5. Analysis by secondary ion mass spectroscopy shows that iron incorporation is proportional to the Fe(CO)5 flow rate over the 5×1017–5×1019 cm−3 range studied. Use of Fe(CO)5 as an iron source also leads to high ∼1018 cm−3 carbon incorporation in the material, but this does not interfere with semi‐insulating behavior. The material shows 30 MΩ cm resistivity for a broad range of Fe(CO)5 flow rates. No oxygen incorporation was observed
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semi insulating inp grown by chemical beam epitaxy with Pentacarbonyliron doping
Applied Physics Letters, 1995Co-Authors: J D Walker, W. T. TsangAbstract:We present semi‐insulating iron‐doped InP grown by chemical beam epitaxy using the gaseous source Pentacarbonyliron, Fe(CO)5. Analysis by secondary ion mass spectroscopy shows that iron incorporation is proportional to the Fe(CO)5 flow rate over the 5×1017–5×1019 cm−3 range studied. Use of Fe(CO)5 as an iron source also leads to high ∼1018 cm−3 carbon incorporation in the material, but this does not interfere with semi‐insulating behavior. The material shows 30 MΩ cm resistivity for a broad range of Fe(CO)5 flow rates. No oxygen incorporation was observed
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Pentacarbonyliron doping for semi-insulating InP by chemical beam epitaxy
Indium Phosphide and Related Materials, 1995. Conference Proceedings., Seventh International Conference on, 1995Co-Authors: W. T. Tsang, J D WalkerAbstract:We present semi-insulating iron-doped InP grown by chemical beam epitaxy using the gaseous iron Fe(CO)5. SIMS analysis shows that iron incorporation is proportional to the Fe(CO)5 flow rate over the 5×1017-5×1019 cm-3 range studied. Use of Fe(CO)5 as an iron source also leads to high αp 1018 cm-3 carbon incorporation in the material, but this does not interfere with semi-insulating behavior. The material shows 30 MΩ-cm resistivity for a broad range of Fe(CO)5 flow rates
J D Walker - One of the best experts on this subject based on the ideXlab platform.
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Semi‐insulating InP grown by chemical beam epitaxy with Pentacarbonyliron doping
Applied Physics Letters, 1995Co-Authors: J D Walker, W. T. TsangAbstract:We present semi‐insulating iron‐doped InP grown by chemical beam epitaxy using the gaseous source Pentacarbonyliron, Fe(CO)5. Analysis by secondary ion mass spectroscopy shows that iron incorporation is proportional to the Fe(CO)5 flow rate over the 5×1017–5×1019 cm−3 range studied. Use of Fe(CO)5 as an iron source also leads to high ∼1018 cm−3 carbon incorporation in the material, but this does not interfere with semi‐insulating behavior. The material shows 30 MΩ cm resistivity for a broad range of Fe(CO)5 flow rates. No oxygen incorporation was observed
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semi insulating inp grown by chemical beam epitaxy with Pentacarbonyliron doping
Applied Physics Letters, 1995Co-Authors: J D Walker, W. T. TsangAbstract:We present semi‐insulating iron‐doped InP grown by chemical beam epitaxy using the gaseous source Pentacarbonyliron, Fe(CO)5. Analysis by secondary ion mass spectroscopy shows that iron incorporation is proportional to the Fe(CO)5 flow rate over the 5×1017–5×1019 cm−3 range studied. Use of Fe(CO)5 as an iron source also leads to high ∼1018 cm−3 carbon incorporation in the material, but this does not interfere with semi‐insulating behavior. The material shows 30 MΩ cm resistivity for a broad range of Fe(CO)5 flow rates. No oxygen incorporation was observed
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Pentacarbonyliron doping for semi-insulating InP by chemical beam epitaxy
Indium Phosphide and Related Materials, 1995. Conference Proceedings., Seventh International Conference on, 1995Co-Authors: W. T. Tsang, J D WalkerAbstract:We present semi-insulating iron-doped InP grown by chemical beam epitaxy using the gaseous iron Fe(CO)5. SIMS analysis shows that iron incorporation is proportional to the Fe(CO)5 flow rate over the 5×1017-5×1019 cm-3 range studied. Use of Fe(CO)5 as an iron source also leads to high αp 1018 cm-3 carbon incorporation in the material, but this does not interfere with semi-insulating behavior. The material shows 30 MΩ-cm resistivity for a broad range of Fe(CO)5 flow rates
Hans-joachim Knölker - One of the best experts on this subject based on the ideXlab platform.
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Transition Metal Complexes in Organic Synthesis. Part 57: Synthesis of 1-Azabuta-1,3-dienes and Application to Catalytic Complexation of Buta-1,3-dienes and Cycloalkadienes by the Tricarbonyliron Fragment
Tetrahedron, 2000Co-Authors: Hans-joachim Knölker, Birte Ahrens, Peter Gonser, Michael Heininger, Peter G. JonesAbstract:The 1-azabuta-1,3-dienes 5a – g were prepared and transformed to the corresponding tricarbonyliron complexes 6 . The efficiency of 6 as tricarbonyliron transfer reagents and the activity of 5a – g for the catalytic complexation with either nonacarbonyldiiron or Pentacarbonyliron was investigated. It was shown that the catalytic complexation with Pentacarbonyliron using the azadiene 5b as catalyst in dioxane at reflux can be applied to 1-methoxycyclohexa-1,4-diene.
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Transition metal complexes in organic synthesis, part 50. Asymmetric catalytic complexation of 1-methoxycyclohexa-1,3-diene by the tricarbonyliron fragment using amino acid-derived 1-azabuta-1,3-dienes
Tetrahedron Letters, 1999Co-Authors: Hans-joachim Knölker, Daniela HerzbergAbstract:Abstract l -Amino acid esters as chiral auxiliaries in the asymmetric complexation of 1-methoxycyclohexa-1,3-diene with Pentacarbonyliron afford the R -enantiomer of the corresponding planar chiral tricarbonyliron complex in up to 24% ee .
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1,4-Diaryl-1-azabuta-1,3-diene-Catalyzed Complexation of Cyclohexa-1,3-diene by the Tricarbonyliron Fragment: Development of Highly Efficient Catalysts, Optimization of Reaction Conditions, and Proposed Mechanism†
Organometallics, 1998Co-Authors: Hans-joachim Knölker, Peter Gonser, Elke Baum, And Guy Rohde, Herbert RötteleAbstract:The 1,4-diaryl-1-azabuta-1,3-diene-catalyzed complexation of cyclohexa-1,3-diene with either nonacarbonyldiiron or Pentacarbonyliron is reported to provide high yields of the tricarbonyl(η4-cyclohexa-1,3-diene)iron complex. This procedure enables exploitation of both tricarbonyliron fragments of nonacarbonyldiiron for the complexation of dienes for the first time. Using 12.5 mol % of 1-(4-methoxyphenyl)-4-phenyl-1-azabuta-1,3-diene and optimized reaction conditions (nonacarbonyldiiron, dimethoxyethane, reflux, 16.5 h, or Pentacarbonyliron, dioxane, reflux, 45 h), a quantitative catalytic complexation of cyclohexa-1,3-diene is feasible with both reagents. An extensive study with a broad range of 1,4-diaryl-1-azabuta-1,3-dienes shows that the efficiency of the catalysts strongly depends on the substituents of the two aryl rings. Remarkably high activities are found for those catalysts deriving from condensation of cinnamaldehyde and ortho-methoxy-substituted arylamines. A hexacarbonyldiiron complex of 1-(4-...
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Transition Metal-Diene Complexes in Organic Synthesis, Part 20.1 Development of Highly Efficient 1-Aza-1,3-butadiene Catalysts for the Complexation of 1,3-Dienes by the Tricarbonyliron Fragment
Synlett, 1994Co-Authors: Hans-joachim Knölker, Peter Gonser, Peter G. JonesAbstract:Condensation of cinnamaldehydes with appropriately functionalized arylamines provides highly efficient catalysts for the complexation of 1,3-dienes with Pentacarbonyliron.
Peter G. Jones - One of the best experts on this subject based on the ideXlab platform.
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A Cyclobutadiene Intermediate in the Intramolecular Cycloaddition of 4,15-Bis(phenylethynyl)[2.2]paracyclophane†‡
European Journal of Organic Chemistry, 2020Co-Authors: Jens Kubitschke, Peter G. Jones, Henning Hopf, Ludger ErnstAbstract:The pseudo-geminally substituted paracyclophane 4,5-bis(phenylethynyl)[2.2]paracyclophane (13) was prepared and its photochemical behaviour in solution was studied. Irradiation with a medium-pressure mercury lamp converts 13 into two dimers: cyclooctatetraene 14 and bicyclo[4.2.0]octatriene derivative 15. The structures of both the substrate and the photolysis products were determined by the usual spectroscopic methods and also by X-ray structural analysis; an unusually long C–C bond of 1.659 A opposite the double bond in the cyclobutene ring of 15 was found. It is suggested that product formation involves cyclobutadiene 16 as an intermediate. Photolysis of 13 in the presence of Pentacarbonyliron furnishes cyclopentadienone complex 19 in quantitative yield. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)
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Transition Metal Complexes in Organic Synthesis. Part 57: Synthesis of 1-Azabuta-1,3-dienes and Application to Catalytic Complexation of Buta-1,3-dienes and Cycloalkadienes by the Tricarbonyliron Fragment
Tetrahedron, 2000Co-Authors: Hans-joachim Knölker, Birte Ahrens, Peter Gonser, Michael Heininger, Peter G. JonesAbstract:The 1-azabuta-1,3-dienes 5a – g were prepared and transformed to the corresponding tricarbonyliron complexes 6 . The efficiency of 6 as tricarbonyliron transfer reagents and the activity of 5a – g for the catalytic complexation with either nonacarbonyldiiron or Pentacarbonyliron was investigated. It was shown that the catalytic complexation with Pentacarbonyliron using the azadiene 5b as catalyst in dioxane at reflux can be applied to 1-methoxycyclohexa-1,4-diene.
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Transition Metal-Diene Complexes in Organic Synthesis, Part 20.1 Development of Highly Efficient 1-Aza-1,3-butadiene Catalysts for the Complexation of 1,3-Dienes by the Tricarbonyliron Fragment
Synlett, 1994Co-Authors: Hans-joachim Knölker, Peter Gonser, Peter G. JonesAbstract:Condensation of cinnamaldehydes with appropriately functionalized arylamines provides highly efficient catalysts for the complexation of 1,3-dienes with Pentacarbonyliron.
O. V. Chakhovskaya - One of the best experts on this subject based on the ideXlab platform.
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Transformations of 4-oxo-4H-chromene-3-carbaldehyde under the action of Fe(CO)_5
Russian Journal of Organic Chemistry, 2012Co-Authors: A. A. Ambartsumyan, N. E. Mysova, O. V. Chakhovskaya, T. T. Vasil’eva, V. A. Tuskaev, V. N. Khrustalev, K. A. KochetkovAbstract:Transformations of 4-oxo-4 H -chromene-3-carbaldehyde in the presence of Pentacarbonyliron and HMPA in benzene and toluene were studied, and their probable mechanism was proposed. The structure of 3-(4-oxochroman-3-ylmethyl)-4 H -chromen-4-one was determined by spectral methods and X-ray analysis.
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Diastereoselective synthesis of pinacols from aromatic aldehydes using the system Pentacarbonyliron-hexamethylphosphoric triamide. Dual reactivity of pentafluorobenzaldehyde
Russian Journal of Organic Chemistry, 2007Co-Authors: A. B. Terent’ev, N. E. Mysova, O. V. Chakhovskaya, T. T. Vasil’eva, K. A. KochetkovAbstract:The system Fe(CO)_5-HMPA effectively promotes diastereoselective reductive dimerization of aromatic aldehydes to the corresponding pinacols having preferentially or exclusively dl configuration. In the reaction with pentafluorobenzaldehyde, the product structure strongly depends on the presence of traces of moisture in the reaction system.
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Reactions of Diethyl Dibromomalonate and Ethyl 2,2-Dichloroacetoacetate with Water and Carbonyl Compounds (Aldehydes and Ketones) in the Presence of Pentacarbonyliron
Russian Journal of Organic Chemistry, 2004Co-Authors: A. B. Terent'ev, T. T. Vasil'eva, N. E. Mysova, O. V. ChakhovskayaAbstract:Diethyl dibromomalonate and ethyl 2,2-dichloroacetoacetate are effectively reduced with the system Pentacarbonyliron-proton-donor compound (water or butyl methyl ketone) to give the corresponding hydrodehalogenation products. These results provide a support for the previous assumption that the key reaction stage is reduction with Pentacarbonyliron of initially formed radical to anion which is then involved in proton transfer.
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Barbier-Type Addition of Alkyl Halides to Aldehydes Promoted by Pentacarbonyliron
Russian Journal of Organic Chemistry, 2002Co-Authors: T. T. Vasil'eva, N. E. Mysova, O. V. Chakhovskaya, A. B. Terent'evAbstract:The yield and structure of products of the Barbier-type addition of alkyl halides (perfluorobutyl iodide, allyl bromide, allyl iodide, and hexyl iodide) to para -substituted benzaldehydes in the presence of Pentacarbonyliron are essentially determined, on the one hand, by the ability of alkyl halide to be reduced to carbanion and, on the other, by the electrophilicity of the aldehyde reaction center which in turn depends on the nature of para -substituent in the aromatic ring.
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Addition of α-Halocarboxylic Acid Esters to para-Substituted Benzaldehydes in the Presence of Pentacarbonyliron
Russian Journal of Organic Chemistry, 2001Co-Authors: A. B. Terent'ev, T. T. Vasil'eva, N. E. Mysova, N. A. Kuz'mina, O. V. ChakhovskayaAbstract:Pentacarbonyliron promotes addition of α-halocarboxylic acid esters at the carbonyl group of benzaldehyde and its para -substituted analogs. The substituent in the benzene ring strongly affects the process.
