scholarly journals Further Astrochemical Insights From Bond Strengths of Small Molecules Containing Atoms From the First Three Rows of the Periodic Table

2021 ◽  
Vol 8 ◽  
Author(s):  
Edmund S. Doerksen ◽  
Ryan C. Fortenberry
Keyword(s):  
Small Molecules ◽  
Periodic Table ◽  
Triple Bond ◽  
Oxide Formation ◽  
Chemical Examination ◽  
Close Match ◽  
Inorganic Oxide ◽  
Triple Bonds ◽  
Bond Strengths ◽  
Single Bonds

The atoms contributing to the strongest “single bonds” on the periodic table do not continue to produce the strongest “double bonds” or “triple bonds.” In fact, the opposite appears to be the case. This quantum chemical examination of nominal X = Y and X ≡ Y bonds in model molecules of atoms from the first three rows of the periodic table shows that the strongest “double bond” is in formaldehyde once the astrophysically-depleted Be and B atoms are removed from consideration. The strongest “triple bond” is a close match between acetylene and N2. However, these results indicate that astrophysical regions containing a high abundance of hydride species will likely be areas where inorganic oxide formation is favored. Those where H2 molecules have already been dissociated will favor organic/volatile astrochemistry.

Some alkali metal alkyl amides as alkyne isomerization reagents: selective isomerization of one triple bond of a diynol

1983 ◽  
Vol 61 (6) ◽  
pp. 1073-1076 ◽  
Author(s):  
Suzanne R. Abrams ◽  
Donato D. Nucciarone ◽  
Warren F. Steck
Keyword(s):  
Sex Pheromone ◽  
Alkali Metal ◽  
Sodium Salt ◽  
Triple Bond ◽  
Lithium Salt ◽  
Terminal Position ◽  
Sodium Salts ◽  
Triple Bonds ◽  
High Yields ◽  
Insect Sex

The lithium and sodium salts of 1,2-diaminoethane, 1,3-diaminopropane, n-butylamine, and the lithium salt of isobutylamine were studied as potential reagents for isomerization of triple bonds in alkyn-1-ols. The sodium salts of the diamines afforded high yields of the ω-alkyn-1-ol. Somewhat surprisingly, the sodium salt of n-butylamine also effects isomerization to the terminal position. The lithium salt of 1,3-diaminopropane gave the highest conversion of 2- to 3-alkyn-1-ol. A novel, selective rearrangement of one triple bond of a diynol, a 2, ω- to 3, ω-diyn-1-ol isomerization, was incorporated into a synthesis of the insect sex pheromone 3,13-octadecadienol acetate.

Cleavage of BN triple bonds by main group reagents

2018 ◽  
Vol 54 (59) ◽  
pp. 8210-8213 ◽  
Author(s):  
Lena Winner ◽  
Alexander Hermann ◽  
Guillaume Bélanger-Chabot ◽  
Oscar F. González-Belman ◽  
J. Oscar C. Jiménez-Halla ◽  
...  
Keyword(s):  
Triple Bond ◽  
Main Group ◽  
Triple Bonds

A silylene and a 1,2-diaminoalkyne respectively cleave the strong BN triple bond in iminoboranes.

scholarly journals Carbyne with finite length: The one-dimensional sp carbon

2015 ◽  
Vol 1 (9) ◽  
pp. e1500857 ◽  
Author(s):  
Bitao Pan ◽  
Jun Xiao ◽  
Jiling Li ◽  
Pu Liu ◽  
Chengxin Wang ◽  
...  
Keyword(s):  
Laser Ablation ◽  
Molecular Orbital ◽  
Finite Length ◽  
Hexagonal Lattice ◽  
Alcohol Molecule ◽  
Laser Ablation In Liquid ◽  
One Dimensional ◽  
Triple Bonds ◽  
The One ◽  
Single Bonds

Carbyne is the one-dimensional allotrope of carbon composed of sp-hybridized carbon atoms. Definitive evidence for carbyne has remained elusive despite its synthesis and preparation in the laboratory. Given the remarkable technological breakthroughs offered by other allotropes of carbon, including diamond, graphite, fullerenes, carbon nanotubes, and graphene, interest in carbyne and its unusual potential properties remains intense. We report the first synthesis of carbyne with finite length, which is clearly composed of alternating single bonds and triple bonds, using a novel process involving laser ablation in liquid. Spectroscopic analyses confirm that the product is the structure of sp hybridization with alternating carbon-carbon single bonds and triple bonds and capped by hydrogen. We observe purple-blue fluorescence emissions from the gap between the highest occupied molecular orbital and the lowest unoccupied molecular orbital of carbyne. Condensed-phase carbyne crystals have a hexagonal lattice and resemble the white crystalline powder produced by drying a carbyne solution. We also establish that the combination of gold and alcohol is crucial to carbyne formation because carbon-hydrogen bonds can be cleaved with the help of gold catalysts under the favorable thermodynamic environment provided by laser ablation in liquid and because the unique configuration of two carbon atoms in an alcohol molecule matches the elementary entity of carbyne. This laboratory synthesis of carbyne will enable the exploration of its properties and applications.

Intramolecular Addition of a Dimethylamino C(sp3)–H Bond across C–C Triple Bonds using IrCl(DTBM-SEGPHOS)(ethylene) Catalyst: Synthesis of Indoles from 2-Alkynyl-N-methylanilines

Synthesis ◽  
2021 ◽  
Author(s):  
Toshimichi Ohmura ◽  
Kaito Yagi ◽  
Takeru Torigoe ◽  
Michinori Suginome
Keyword(s):  
Double Bond ◽  
Triple Bond ◽  
Iridium Complex ◽  
Dimethylamino Group ◽  
Catalyst Synthesis ◽  
Double Bond Isomerization ◽  
Triple Bonds ◽  
High Yields

Intramolecular addition of a C(sp3)–H bond of a dimethylamino group across a C–C triple bond in 2-alkynyl-N,N-dimethylanilines was effectively catalyzed by a new iridium complex IrCl(DTBM-SEGPHOS)(C2H4) in mesitylene at 150 °C. The intramolecular C(sp3)–H addition was followed by double bond isomerization to afford 3-substituted indoles in good to high yields.

Metallkomplexe mit Tetrapyrrol-Liganden, XXVIII. Mononukleare Nitridomangan(V)-Porphyrine: die ersten Mangan-Stickstoff-Dreifachbindungen/ Metal Complexes with Tetrapyrrole Ligands, XXVIII. Mononuclear Nitridomanganese(V) Porphyrins: the First Manganese Nitrogen Triple Bonds

1982 ◽  
Vol 37 (9) ◽  
pp. 1155-1162 ◽  
Author(s):  
Johann W. Buchler ◽  
Christine Dreher ◽  
Kiong Lam Lay
Keyword(s):  
Metal Complexes ◽  
Triple Bond ◽  
Mass Spectra ◽  
H Nmr ◽  
Triple Bonds

AbstractThe first complexes containing a manganese-nitrogen triple bond, nitrido(octaethylporphinato) manganese(V) [MnN(OEP)]** and nitrido[meso-tetra(p-tolyl)porphinato]manganese( V) [MnN(TTP)], are prepared by hypochlorite oxidation of the corresponding methoxomanganese( III) porphyrins, Mn(OEP)OMe and Mn(TTP)OMe, in the presence of ammonia. The red, pentacoordinated, diamagnetic species are identified by UV/VIS-, IR-, 1H NMR, and mass spectra. While the isoelectronic oxochromium(IV) or oxomolybdenum( IV) porphyrins behave as weak oxidants or reductants, respectively, the nitridomanganese( V) unit in the square pyramidal environment is chemically remarkably stable.

The tungsten-tungsten triple bond. 13. Bisalkyl tetracarboxylates of dimolybdenum and ditungsten. Triple bonds between metal atoms with the valence molecular orbital description .pi.4.delta.2

1987 ◽  
Vol 109 (22) ◽  
pp. 6796-6816 ◽  
Author(s):  
Malcolm H. Chisholm ◽  
David L. Clark ◽  
John C. Huffman ◽  
William G. Van der Sluys ◽  
Edward M. Kober ◽  
...  
Keyword(s):  
Molecular Orbital ◽  
Triple Bond ◽  
Triple Bonds ◽  
Metal Atoms ◽  
Valence Molecular Orbital
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