Polymerization reactions of acrylonitrile on zeolite surfaces

1980 ◽  
Vol 33 (3) ◽  
pp. 653 ◽  
Author(s):  
AT Petfield ◽  
RP Cooney
Keyword(s):  
Infrared Spectra ◽  
Cyclic Dimer ◽  
Surface Species ◽  
Spectral Analyses ◽  
Mass Spectral ◽  
Adsorption Sites ◽  
Bonding Interaction ◽  
Adsorption Complexes

Infrared and mass spectral analyses are reported of the surface species generated when the adsorption complexes zeolite+acrylonitrile are heated. The evidence presented indicates that H2O competes favourably for zeolitic adsorption sites with acrylonitrile. Infrared spectra suggest that a C2 π-bonding interaction may be important in the adsorption of acrylonitrile. Heating adsorbed acrylonitrile appears to generate polyacrylonitrile products which may include a cyclic dimer. Extended heating results in the possible formation of conjugated nitrile species, polyenes and even more extensively carbonized products.

Synthesis of Novel Bis-pyrazoles via Electrophilic Cyclization

2019 ◽  
Vol 16 (6) ◽  
pp. 511-516
Author(s):  
Adnan Cetin
Keyword(s):  
13C Nmr ◽  
Cyclization Reaction ◽  
Electrophilic Cyclization ◽  
Pyrazole Derivatives ◽  
Spectral Analyses ◽  
Mass Spectral ◽  
Palladium Catalyzed ◽  
Ft Ir ◽  
Reaction Compound

Efficient steps towards the synthesis of novel (phenyl)(1'-aryl-1,5,5'-triphenyl[3,3'-bi-1Hpyrazol]- 4-yl)methanones 4a-e were developed. The procedure starts from 1-(4-benzoyl-1,5-diphenyl- 1H-3-pyrazolyl)-3-phenyl-2-propyn-1-one (2) which was synthesized by a palladium catalyzed crosscoupling reaction. Compound 2 reacted with various hydrazines to give (E)-(phenyl)[1,5-diphenyl-3- [3-phenyl-1-(2-arylhydrazono)-2-propyn-1-yl]-1H-4-pyrazolyl]methanones E-3a-e. The bis-pyrazole derivatives 4a-e were synthesized from electrophilic cyclization reaction of α,β-acetylenic hydrazones E-3a-e and copper(I) iodide. All synthesized compounds were characterized by FT-IR, 1H, 13C NMR and Mass spectral analyses.

Quantitative determination of surface species and adsorption sites using Infrared spectroscopy

2016 ◽  
Vol 259 ◽  
pp. 19-26 ◽  
Author(s):  
Alan J. McCue ◽  
Greg A. Mutch ◽  
Andrew I. McNab ◽  
Steven Campbell ◽  
James A. Anderson
Keyword(s):  
Infrared Spectroscopy ◽  
Quantitative Determination ◽  
Surface Species ◽  
Adsorption Sites

Standard free energy of the equilibrium between the trans-monomer and the cyclic-dimer of acetic acid in the gas phase from infrared spectroscopy

2015 ◽  
Vol 17 (11) ◽  
pp. 7477-7488 ◽  
Author(s):  
Manuel Goubet ◽  
Pascale Soulard ◽  
Olivier Pirali ◽  
Pierre Asselin ◽  
Florent Réal ◽  
...  
Keyword(s):  
Free Energy ◽  
Acetic Acid ◽  
Infrared Spectroscopy ◽  
Gas Phase ◽  
Infrared Spectra ◽  
Standard Free Energy ◽  
Cyclic Dimer

The dimerization equilibrium of acetic acid in the gas phase at 298 K has been characterized from the analysis of jet-cooled and static cell infrared spectra supported by calculations.

Gas chromatographic and mass spectral analyses of cooked chicken meat volatiles

1967 ◽  
Vol 15 (4) ◽  
pp. 713-717 ◽  
Author(s):  
Masahide. Nonaka ◽  
Dale Robert. Black ◽  
Eldon L. Pippen
Keyword(s):  
Chicken Meat ◽  
Spectral Analyses ◽  
Mass Spectral ◽  
Cooked Chicken Meat

Mass Spectral Analyses of Corn Stover Prehydrolysates To Assess Conditioning Processes

2010 ◽  
Vol 58 (24) ◽  
pp. 12642-12649 ◽  
Author(s):  
Richard F. Helm ◽  
Judith Jervis ◽  
W. Keith Ray ◽  
Nicholas Willoughby ◽  
Benjamin Irvin ◽  
...  
Keyword(s):  
Corn Stover ◽  
Spectral Analyses ◽  
Mass Spectral

The influence of hydrogen bonding on the character of N—H and C=O stretching modes in 2-thiopyrrole-1,2-dicarboximide

1984 ◽  
Vol 62 (9) ◽  
pp. 1845-1849 ◽  
Author(s):  
Shanker Ram
Keyword(s):  
Hydrogen Bonding ◽  
Transition Temperature ◽  
Solid State ◽  
Hydrogen Bonds ◽  
Spectral Data ◽  
Infrared Spectra ◽  
Cyclic Dimer ◽  
Dilute Solutions ◽  
Two Phases ◽  
Thermodynamical Functions

The infrared spectra (200–4000 cm−1) of 2-thiopyrrole-1,2-dicarboximide (TPH) in solid and solution forms have been measured as a function of temperature, and a direct correlation has been obtained between the two phases and the type and extent of hydrogen bonding. It is suggested that TPH exists as cyclic dimer in the solid state (below 310 K) and in dilute solutions by the formation of two equivalent hydrogen bonds. At the transition temperature, ~310 K, the cyclic dimer undergoes to the open-cyclic dimer and persists in this structure till 410 K. In addition, the thermodynamical functions ΔH0, and ΔS0 have been estimated using the spectral data in solution.

Diversity of long-chain toxins in Tityus zulianus and Tityus discrepans venoms (Scorpiones, Buthidae): Molecular, immunological, and mass spectral analyses

2006 ◽  
Vol 142 (3-4) ◽  
pp. 240-252 ◽  
Author(s):  
Adolfo Borges ◽  
Carmen C. García ◽  
Elizabeth Lugo ◽  
Marcelo J. Alfonzo ◽  
Michael J. Jowers ◽  
...  
Keyword(s):  
Spectral Analyses ◽  
Mass Spectral ◽  
Long Chain
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