ChemInform Abstract: Investigations of 2,3′-Biquinolyls. Part 12. Alkylation and Arylation of 2,3′-Biquinolyl Dianion with Organometallic Compounds. New Type of Reaction for Dianions of Aromatic Compounds.

ChemInform ◽  
2010 ◽  
Vol 33 (17) ◽  
pp. no-no
Author(s):  
A. V. Aksenov ◽  
I. V. Aksenova ◽  
Yu. I. Smushkevich
Keyword(s):  
Aromatic Compounds ◽  
Organometallic Compounds ◽  
New Type

Reactions of aromatic radical-anions and ethyllithium with silica gel and Brönsted acids

1990 ◽  
Vol 55 (3) ◽  
pp. 686-694 ◽  
Author(s):  
Jan Kratochvíla ◽  
Zdeněk Salajka ◽  
Antonín Kazda ◽  
Zbyněk Kadlc ◽  
Mihnea Gheorghiu
Keyword(s):  
Silica Gel ◽  
Aromatic Compounds ◽  
Organometallic Compounds ◽  
Radical Anions ◽  
Liquid Media ◽  
Structure And Bonding ◽  
Activated Silica Gel ◽  
Increasing Temperature ◽  
Hydroxy Groups ◽  
Acidic Hydrogen

Electric conductivities of radical-anions prepared from several aromatic compounds (biphenyl, naphthalene, benzophenone, anthracene, phenanthrene) and sodium in tetrahydrofuran have been measured and a suitability of radical-anions for titration of silica gel and acid impurities in liquid media have been investigated. The reactivity of the radical-anions and ethyllithium with acidic hydrogen of silica gel hydroxy groups is approximately equal in spite of substantial differences in structure and bonding character of the above compounds. Highest amounts of radical-anions and ethyllithium are decomposed by thermally non-activated silica gel (1.7 to 1.8 mmol g-1 for Davison, grade 952). With the increasing temperature of dehydration of silica gel (200-900 °C), the amount of decomposed organometallic compounds decreases approximately linearly.

The Stereochemistry of Organometallic Compounds. XLIV Rhodium-Catalysed Hydroformylation of Some Alkenylthio Aromatic Compounds

1997 ◽  
Vol 50 (8) ◽  
pp. 807 ◽  
Author(s):  
Eva M. Campi ◽  
W. Roy Jackson ◽  
Andrew E. Trnacek
Keyword(s):  
Polymeric Material ◽  
Aromatic Compounds ◽  
Organometallic Compounds

Rhodium-catalysed reactions of o-[(allyl and butenyl)thio] benzonitriles and benzamides with H2/CO give quantitative yields of aldehydes whereas the corresponding benzylamines give only polymeric material. The results are compared with reactions of the analogous alkenylamines and alkenyloxy compounds.

Darstellung und Eigenschaften der Tris-(4-dimethylamino-phenyl)-arsen(V)- und -antimon(V)-Kationen / Synthesis and Properties of the Tris- (4-dimethylamino-phenyl) -Arsenic (V) - and -Antimony (V) -Cations

1972 ◽  
Vol 27 (6) ◽  
pp. 596-599 ◽  
Author(s):  
Jörn-Michael Keck ◽  
Günter Klar
Keyword(s):  
Electronic Structure ◽  
Coordination Number ◽  
Oxidation State ◽  
Crystal Violet ◽  
Organometallic Compounds ◽  
New Type

The synthesis of a new type of organometallic compounds with a group VB element and the composition Ar3E2+ (Ar = 4-dimethylamino-phenyl; E = As, Sb) in which this element has the oxidation state +5 and the coordination number 3 is reported. In accordance with the electronic and n.m.r. spectra it is assumed that the electronic structure of these intensive blue cations is similar to that of the isoelectronic cation of crystal violet.

The Microstructure of Shock-Synthesized Diamond

1967 ◽  
Vol 25 ◽  
pp. 324-325
Author(s):  
Lucien F. Trueb
Keyword(s):  
Single Crystals ◽  
Preferred Orientation ◽  
High Magnification ◽  
Texture Pattern ◽  
Shock Process ◽  
New Type ◽  
Diffraction Diagram

A new type of synthetic industrial diamond formed by an explosive shock process has been recently developed by the Du Pont Company. This material consists of a mixture of two basically different forms, as shown in Figure 1: relatively flat and compact aggregates of acicular crystallites, and single crystals in the form of irregular polyhedra with straight edges.Figure 2 is a high magnification micrograph typical for the fibrous aggregates; it shows that they are composed of bundles of crystallites 0.05-0.3 μ long and 0.02 μ. wide. The selected area diffraction diagram (insert in Figure 2) consists of a weak polycrystalline ring pattern and a strong texture pattern with arc reflections. The latter results from crystals having preferred orientation, which shows that in a given particle most fibrils have a similar orientation.

New type electron gun with electrostatic and electromagnetic lenses

1978 ◽  
Vol 36 (1) ◽  
pp. 62-63
Author(s):  
T. Ichinokawa ◽  
H. Maeda
Keyword(s):  
Electron Microscopy ◽  
Electron Beam ◽  
Optimum Condition ◽  
Bias Voltage ◽  
Electron Gun ◽  
Charge Effect ◽  
Micro Fabrication ◽  
Maximum Brightness ◽  
New Type ◽  
The Ideal

I. IntroductionThermionic electron gun with the Wehnelt grid is popularly used in the electron microscopy and electron beam micro-fabrication. It is well known that this gun could get the ideal brightness caluculated from the Lengumier and Richardson equations under the optimum condition. However, the design and ajustment to the optimum condition is not so easy. The gun has following properties with respect to the Wehnelt bias; (1) The maximum brightness is got only in the optimum bias. (2) In the larger bias than the optimum, the brightness decreases with increasing the bias voltage on account of the space charge effect. (3) In the smaller bias than the optimum, the brightness decreases with bias voltage on account of spreading of the cross over spot due to the aberrations of the electrostatic immersion lens.In the present experiment, a new type electron gun with the electrostatic and electromagnetic lens is designed, and its properties are examined experimentally.

A new type of defect structure in 124-superconducting oxide revealed by HREM

1991 ◽  
Vol 49 ◽  
pp. 1092-1093
Author(s):  
R. Sharma ◽  
B.L. Ramakrishna ◽  
N.N. Thadhani ◽  
D. Hianes ◽  
Z. Iqbal
Keyword(s):  
Shock Wave ◽  
Defect Structure ◽  
Neutron Radiation ◽  
Weak Links ◽  
Defect Structures ◽  
New Materials ◽  
New Type ◽  
Current Densities ◽  
Processing Techniques ◽  
Microstructural Studies

After materials with superconducting temperatures higher than liquid nitrogen have been prepared, more emphasis has been on increasing the current densities (Jc) of high Tc superconductors than finding new materials with higher transition temperatures. Different processing techniques i.e thin films, shock wave processing, neutron radiation etc. have been applied in order to increase Jc. Microstructural studies of compounds thus prepared have shown either a decrease in gram boundaries that act as weak-links or increase in defect structure that act as flux-pinning centers. We have studied shock wave synthesized Tl-Ba-Cu-O and shock wave processed Y-123 superconductors with somewhat different properties compared to those prepared by solid-state reaction. Here we report the defect structures observed in the shock-processed Y-124 superconductors.

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