Olfactory, gas chromatographic and mass-spectral analyses of fecal volatiles traced to ingested licorice and apple

1985 ◽  
Vol 131 (1) ◽  
pp. 339-346 ◽  
Author(s):  
J.G. Moore ◽  
R.C. Straight ◽  
D.N. Osborne ◽  
A.W. Wayne
Keyword(s):  
Spectral Analyses ◽  
Mass Spectral

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.

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

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

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.

Solvolytic rearrangement studies with 14C or 13C labeled (E)- and (Z)-1,2-diphenyl-2-tolylvinyl bromides

1986 ◽  
Vol 64 (6) ◽  
pp. 1228-1234
Author(s):  
Choi Chuck Lee ◽  
Dave Wanigasekera
Keyword(s):  
Detectable Amount ◽  
Spectral Analyses ◽  
Mass Spectral ◽  
Vinyl Bromide ◽  
Product Mixture ◽  
Pure Product ◽  
Before And After ◽  
Chromatographic Mass

The reaction of (E)-, (Z)-, or a 2:3 mixture of (E)- and (Z)-1,2-diphenyl-2-tolyl[2-14C]vinyl bromide ((E)-, (Z)-, or (E,Z)-3-Br-2-14C) in HOAc–AgOAc gave a 1:1 mixture of the structurally unrearranged but isotopically scrambled (E)- and (Z)-1,2-diphenyl-2-tolyl[1,2-14C]vinyl acetates ((E,Z)-3-OAc-1,2-14C), with an average of 18.3% scrambling of the 14C label from C-2 to C-1 arising from 1,2-tolyl shifts in the 1,2-diphenyl-2-tolylvinyl cation (3). No detectable amount of the structurally rearranged 2,2-diphenyl-1-tolylvinyl acetate (4-OAc) was formed. Solvolysis of (E,Z)-3-Br-2-14C in TFE-2,6-lutidine gave as products 62% 4-OTFE-1,2-14C and 38% of a 1:1 mixture of (E)- and (Z)-3-OTFE-1,214C. Only (Z)-3-OTFE-1,2-14C could be isolated as a pure product and it showed an average of 44.7% scrambling of the label from C-2 to C-1. Similar trifluoroethanolyses of (E,Z)-3-Br-2-13C coupled with gas chromatographic - mass spectral analyses of the diphenyl and phenyl tolyl ketones from ozonolysis of the product mixture showed 44.6% scrambling in the (E,Z)-3-OTFE-1,2-13C, confirming the 14C results for the (Z) isomer. Nondegenerate rearrangements from 1,2-phenyl shifts before and after the degenerate 1,2-tolyl shifts to give 4-OTFE-1-13C and 4-OTFE-2-13C were also observed, demonstrating the occurrence of successive 1,2-aryl shifts in these triarylvinyl cations.

Sign in / Sign up

Export Citation Format

Share Document