The Stability of Pinacolates in Liquid Ammonia Solution

1936 ◽  
Vol 58 (1) ◽  
pp. 76-78 ◽  
Author(s):  
Charles Bushnell Wooster ◽  
Donald S. Latham
Keyword(s):  
Liquid Ammonia ◽  
Ammonia Solution ◽  
The Stability

Liquid Ammonia Solution. I. Absorption Spectrophotometry

1965 ◽  
Vol 4 (7) ◽  
pp. 1002-1006 ◽  
Author(s):  
E. C. Fohn ◽  
R. E. Cuthrell ◽  
J. J. Lagowski
Keyword(s):  
Liquid Ammonia ◽  
Ammonia Solution ◽  
Absorption Spectrophotometry

Electrodeposition of Bright Nickel from Liquid Ammonia Solution Containing Chloride

2016 ◽  
Vol 163 (14) ◽  
pp. D829-D835 ◽  
Author(s):  
Lian-Kui Wu ◽  
Wei-Ke Wang ◽  
Hua-Zhen Cao ◽  
Guang-Ya Hou ◽  
Yi-Ping Tang ◽  
...  
Keyword(s):  
Liquid Ammonia ◽  
Ammonia Solution

A Study of the Reducing Action of Sodium upon Salts in Liquid Ammonia Solution.

1931 ◽  
Vol 8 (2) ◽  
pp. 265-272 ◽  
Author(s):  
Wayland M. Burgess ◽  
Edward H. Smoker
Keyword(s):  
Liquid Ammonia ◽  
Ammonia Solution

Synthesis of Methoxynor Polyisoprenoid Alcohols by Alkylation of (3-Methoxyallyl)lithium Reagents

2002 ◽  
Vol 67 (1) ◽  
pp. 55-74 ◽  
Author(s):  
Qingwu Jin ◽  
Robert M. Coates
Keyword(s):  
Liquid Ammonia ◽  
Displacement Method ◽  
Enol Ether ◽  
Cyclization Reactions ◽  
Terpene Synthases ◽  
Substrate Analogs ◽  
Benzyl Ethers ◽  
Methoxy Substituent ◽  
The Stability ◽  
Transient Intermediates

A series of six methyl enol ether analogs 8-13 of geraniol, (E,E)-farnesol, and (E,E,E)-geranylgeraniol was synthesized from a group of three allylic methyl ethers and three allylic chlorides. Lithiation of the 1-methyl-, or 1-alkenylvinyl ethers with sec-butyllithium at -78 °C followed by alkylations of the resulting (Z)-(3-methoxyallyl)lithium reagents afforded the six possible Z-configured(trans) methoxynor polyprenyl benzyl ethers bearing the methoxy substituent at the internal and terminal double bonds with high Z/E ratios (5 : 1-31 : 1) and 47-80% yields. Reductive cleavage of the benzyl groups with lithium in liquid ammonia gave the corresponding methoxynor polyprenols. 11-Methoxy-18-nor and 7-methoxy-19-nor geranylgeraniols (13 and 12) were converted to the corresponding diphosphates, 7 and 32, by the Poulter displacement method. The stability of the enol ether in 7 in aqueous solution at pH 8 was verified by NMR analyses. The diphosphates of the methoxynor polyprenols may prove useful as substrate analogs for terpene synthases to capture transient intermediates in cyclization reactions catalyzed by these enzymes.

scholarly journals Unique thermodynamic relationships for Δf H o and Δf G o for crystalline inorganic salts. I. Predicting the possible existence and synthesis of Na2SO2 and Na2SeO2

2012 ◽  
Vol 68 (5) ◽  
pp. 511-527 ◽  
Author(s):  
Ángel Vegas ◽  
Joel F. Liebman ◽  
H. Donald Brooke Jenkins
Keyword(s):  
High Pressure ◽  
Solid State ◽  
Alkali Metal ◽  
Liquid Ammonia ◽  
Structural Changes ◽  
Target Material ◽  
The Other ◽  
Inorganic Salts ◽  
Linear Relationships ◽  
The Stability

The concept that equates oxidation and pressure has been successfully utilized in explaining the structural changes observed in the M 2S subnets of M 2SO x (x = 3, 4) compounds (M = Na, K) when compared with the structures (room- and high-pressure phases) of their parent M 2S `alloy' [Martínez-Cruz et al. (1994), J. Solid State Chem. 110, 397–398; Vegas (2000), Crystallogr. Rev. 7, 189–286; Vegas et al. (2002), Solid State Sci. 4, 1077–1081]. These structural changes suggest that if M 2SO2 would exist, its cation array might well have an anti-CaF2 structure. On the other hand, in an analysis of the existing thermodynamic data for M 2S, M 2SO3 and M 2SO4 we have identified, and report, a series of unique linear relationships between the known Δf H o and Δf G o values of the alkali metal (M) sulfide (x = 0) and their oxyanion salts M 2SO x (x = 3 and 4), and the similarly between M 2S2 disulfide (x = 0) and disulfur oxyanion salts M 2S2O x (x = 3, 4, 5, 6 and 7) and the number of O atoms in their anions x. These linear relationships appear to be unique to sulfur compounds and their inherent simplicity permits us to interpolate thermochemical data (Δf H o) for as yet unprepared compounds, M 2SO (x = 1) and M 2SO2 (x = 2). The excellent linearity indicates the reliability of the interpolated data. Making use of the volume-based thermodynamics, VBT [Jenkins et al. (1999), Inorg. Chem. 38, 3609–3620], the values of the absolute entropies were estimated and from them, the standard Δf S o values, and then the Δf G o values of the salts. A tentative proposal is made for the synthesis of Na2SO2 which involves bubbling SO2 through a solution of sodium in liquid ammonia. For this attractive thermodynamic route, we estimate ΔG o to be approximately −500 kJ mol−1. However, examination of the stability of Na2SO2 raises doubts and Na2SeO2 emerges as a more attractive target material. Its synthesis is likely to be easier and it is stable to disproportionation into Na2S and Na2SeO4. Like Na2SO2, this compound is predicted to have an anti-CaF2 Na2Se subnet.

scholarly journals [UO2(NH3)5]Br2·NH3: synthesis, crystal structure, and speciation in liquid ammonia solution by first-principles molecular dynamics simulations

2015 ◽  
Vol 44 (16) ◽  
pp. 7332-7337 ◽  
Author(s):  
Patrick Woidy ◽  
Michael Bühl ◽  
Florian Kraus
Keyword(s):  
Crystal Structure ◽  
Molecular Dynamics ◽  
Bond Strength ◽  
Molecular Dynamics Simulations ◽  
First Principles ◽  
Liquid Ammonia ◽  
Ammonia Solution ◽  
X Ray Diffraction ◽  
X Ray ◽  
Dynamics Simulations

X-Ray diffraction and Car–Parrinello molecular dynamics simulations furnish insights into the speciation of uranyl(vi) in liquid ammonia, calling special attention to the effect of solvation on the U–N bond length and bond strength.

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