Elucidation of the Reaction Path for the Nitrosation of 2- and 4-Methylpyridine 1-Oxides with Alkyl Nitrite in Liquid Ammonia

Several TEM investigations have attempted to correlate the structural characteristics to the unusual shape memory effect in NiTi, the consensus being the essence of the memory effect is ostensible manifest in the structure of NiTi transforming martensitic- ally from a B2 ordered lattice to a low temperature monoclinic phase. Commensurate with the low symmetry of the martensite phase, many variants may form from the B2 lattice explaining the very complex transformed microstructure. The microstructure may also be complicated by the enhanced formation of oxide or hydride phases and precipitation of intermetallic compounds by electron beam exposure. Variants are typically found in selfaccommodation groups with members of a group internally twinned and the twins themselves are often observed to be internally twinned. Often the most salient feature of a group of variants is their close clustering around a given orientation. Analysis of such orientation relationships may be a key to determining the nature of the reaction path that gives the transformation its apparently perfect reversibility.

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Ammonolysis of titanium tetrachloride in liquid ammonia

Journal de Chimie Physique ◽

10.1051/jcp/1976730849 ◽

1976 ◽

Vol 73 ◽

pp. 849-851 ◽

Cited By ~ 3

Author(s):

Thomas Kottarathil ◽

Gérard Lepoutre

Keyword(s):

Liquid Ammonia ◽

Titanium Tetrachloride

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Analysis on environmental risk of liquid ammonia leakage in Panjin coproduction power plant

Manufacture Engineering and Environment Engineering ◽

10.2495/meee130501 ◽

2013 ◽

Author(s):

Zhongqiang Ma ◽

Lin Wang ◽

Kemei Hu

Keyword(s):

Power Plant ◽

Environmental Risk ◽

Liquid Ammonia

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Solubility of argon, and gaseous mixture argon-methane-nitrogen in liquid ammonia

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc19703757 ◽

1970 ◽

Vol 35 (12) ◽

pp. 3757-3761 ◽

Cited By ~ 3

Author(s):

J. Matouš ◽

J. Šobr ◽

J. P. Novák

Keyword(s):

Liquid Ammonia ◽

Gaseous Mixture

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Preparation, properties and structure of some intermediate nido- and arachno-monocarbaboranes

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc19812345 ◽

1981 ◽

Vol 46 (10) ◽

pp. 2345-2353 ◽

Cited By ~ 33

Author(s):

Karel Baše ◽

Bohumil Štíbr ◽

Jiří Dolanský ◽

Josef Duben

Keyword(s):

Transition Metal ◽

Metal Complexes ◽

Transition Metal Complexes ◽

Nmr Spectra ◽

Liquid Ammonia ◽

X Ray Diffraction ◽

X Ray ◽

H Nmr ◽

Starting Compound

The 6-N(CH3)3-6-CB9H11 carbaborane reacts with sodium in liquid ammonia with the formation of 6-CB9H12- which was used as a starting compound for preparing the 4-CB8H14, 9-L-6-CB9H13 (L = (CH3)2S, CH3CN and P(C6H5)3), 1-(η5-C5H5)-1,2-FeCB9H10-, and 2,3-(η5-C5H5)2-2,31-Co2CB9H10- carboranes. The 4-CB8H14 compound was dehydrogenated at 623 K to give 4-(7)-CB8H12 carborane. Base degradation of 6-N(CH3)3-6-CB9H11 in methanol resulted in the formation of 3,4-μ-N(CH3)3CH-B5H10. The structure of all compounds was proposed on the basis of their 11B and 1H NMR spectra and X-ray diffraction was used in the case of the transition metal complexes.

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Stability of radical anions derived from substituted 5-nitrofurans investigated by ESR spectroscopy

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc19851594 ◽

1985 ◽

Vol 50 (7) ◽

pp. 1594-1601 ◽

Cited By ~ 5

Author(s):

Jiří Klíma ◽

Larisa Baumane ◽

Janis Stradinš ◽

Jiří Volke ◽

Romualds Gavars

Keyword(s):

Radical Anion ◽

High Stability ◽

Esr Spectroscopy ◽

Reaction Path ◽

Order Reaction ◽

Second Order ◽

Radical Anions ◽

Second Order Reaction ◽

Unpaired Electron Density ◽

The Stability

It has been found that the decay in dimethylformamide and dimethylformamide-water mixtures of radical anions in five of the investigated 5-nitrofurans is governed by a second-order reaction. Only the decay of the radical anion generated from 5-nitro-2-furfural III may be described by an equation including parallel first- and second-order reactions; this behaviour is evidently caused by the relatively high stability of the corresponding dianion, this being an intermediate in the reaction path. The presence of a larger conjugated system in the substituent in position 2 results in a decrease of the unpaired electron density in the nitro group and, consequently, an increase in the stability of the corresponding radical anions.

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Electrolytic reduction of o-nitrobenzyl thiocyanate in buffered solutions on mercury

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc19850033 ◽

1985 ◽

Vol 50 (1) ◽

pp. 33-41 ◽

Cited By ~ 4

Author(s):

Jaromír Hlavatý

Keyword(s):

Acidic Medium ◽

Reaction Path ◽

Electrolytic Reduction ◽

Buffer System ◽

Height Ratio ◽

Preparative Electrolysis ◽

Clear Explanation ◽

Ec Mechanism ◽

Controlled Potential

The o-nitrobenzyl thiocyanate (I) behaves differently on the DME and on a large mercury pool electrode. Polarography did not give a sufficiently clear explanation of the reaction mechanism, only the preparative experiments yielded useful results. Whereas polarographic curves in solutions of Britton-Robinson buffer system with 50% by vol. ethanol exhibit two cathodic waves within the pH region 1-12, corresponding according to their height ratio to an uptake of 4 e and 2 e respectively, the controlled potential preparation electrolysis (CPE) and coulometry results indicate a more complicated reaction path. In the CPE carried out at the concentration of I 1 . 10 -2 mol/l the electroreductive splitting of CH2-SCN occurs as the first step. Nitrobenzyl radicals so formed react in the follow-up dimerization resulting in dibenzyl or toluene structures. Simultaneously or at a later stage the completion of the electrolytic reduction of the nitro group proceeds to the hydroxylamino group. In solution of 9 > pH > 1 the CPE of nitro compound I takes place by an ECEC mechanism yielding dibenzodiazocine III, its N-oxide IV and 2,2'-dimethylazoxybenzene (V). In course of preparative electrolysis in strongly acidic medium 2-amino-benzo(l,3)-thiazine-l-oxide (II) is formed by an EC mechanism.

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