Activity and selectivity of a zinc catalyst in the hydrogenation of an acetylenic to an ethylenic bond

1960 ◽  
Vol 9 (4) ◽  
pp. 696-700 ◽  
Author(s):  
L. Kh. Freidlin ◽  
V. I. Gorshkov
Keyword(s):  
Ethylenic Bond

A study of the reaction of 2-pyridyl isothiocyanate with azoimide

1982 ◽  
Vol 47 (3) ◽  
pp. 877-883 ◽  
Author(s):  
Miroslav Marchalín ◽  
František Považanec ◽  
Augustin Martvoň
Keyword(s):  
Elemental Sulfur ◽  
Ethylenic Bond ◽  
Mechanism Of The Reaction

From the reaction mixture of 2-pyridyl isothiocyanate with azoimide in dioxane 5-(2-pyridyl-amino)tetrzole, 2-pyridylthiourea and elemental sulfur were isolated instead of the expected 5-(2-pyridylamino)-1,2,3,4-thiatriazole. The mechanism of the reaction mentioned was studied on the basis of the synthesis of the assumed intermediates and the isolation of the intermediates by means of compounds with an activated acetylenic or ethylenic bond.

Quantitative effects of unsaturated fatty acids in microbial mutants. VI. Selective growth responses of yeast and bacteria to cis-octadecenoate isomers

1976 ◽  
Vol 54 (8) ◽  
pp. 736-745 ◽  
Author(s):  
John B. Ohlrogge ◽  
Eugene D. Barber ◽  
William E. M. Lands ◽  
F. D. Gunstone ◽  
I. A. Ismail
Keyword(s):  
Fatty Acids ◽  
Unsaturated Fatty Acids ◽  
Ethylenic Bond ◽  
Yeast Cells ◽  
Nutritional Requirement ◽  
Bacterial Cells ◽  
Growth Responses ◽  
Cellular Lipids ◽  
Acyl Chains ◽  
Extensive Growth

The full series of positional isomers of cis-octadecenoate were tested for their suitability in meeting the nutritional requirement for unsaturated fatty acids by mutants of Escherichia coli and Saccharomyces cerevisiae that were unable to synthesize unsaturated fatty acids.Quantitative comparisons of the efficiencies of the various isomers showed a range from 0–48 cells per femtomole for the prokaryotic cells and 0–5 for eukaryotic cells. The Δ5 isomer was much more effective than the Δ6 isomer with the bacterial cells whereas the reverse was true with the yeast cells. In general, isomers containing a cis ethylenic bond between carbons 7 and 12 were able to support extensive growth of either type of mutant.Since all of the various isomers were incorporated into cellular lipids by both types of microorganism, the different efficiencies observed in supporting growth were not a simple reflection of the inability of an acid to be esterified. The differences may reflect the suitability of the resultant esterified product to function as a normal membrane lipid.The contents of various fatty acids in the cellular phospholipids when growth ceases may have a linearly cumulative relationship to the degree of expansion of the acyl chains.

Pd-Catalyzed Cyclization of 1-Allyl-2-indolecarboxamides by Intramolecular Amidation of Unactivated Ethylenic Bond

Synlett ◽  
2006 ◽  
pp. 0073-0076 ◽  
Author(s):  
Gianluigi Broggini ◽  
Giorgio Abbiati ◽  
Egle Beccalli ◽  
Michela Martinelli ◽  
Giuseppe Paladino
Keyword(s):  
Ethylenic Bond ◽  
Intramolecular Amidation

PHOTOIODINATION OE THE ETHYLENIC BOND AT LOW TEMPERATURES

1936 ◽  
Vol 58 (1) ◽  
pp. 182-183 ◽  
Author(s):  
George S. Forbes ◽  
Arthur F. Nelson
Keyword(s):  
Low Temperatures ◽  
Ethylenic Bond

scholarly journals The Ethylenic Bond in Dihydroabietic Acid.

1956 ◽  
Vol 10 ◽  
pp. 481-482 ◽  
Author(s):  
Henrik H. Bruun ◽  
Curt Parck ◽  
Ulf Ulfvarson ◽  
Einar Stenhagen ◽  
B. Thorell
Keyword(s):  
Ethylenic Bond

Pd-Catalyzed Cyclization of 1-Allyl-2-indolecarboxamides by Intramolecular Amidation of Unactivated Ethylenic Bond.

ChemInform ◽  
2006 ◽  
Vol 37 (20) ◽  
Author(s):  
Giorgio Abbiati ◽  
Egle Beccalli ◽  
Gianluigi Broggini ◽  
Michela Martinelli ◽  
Giuseppe Paladino
Keyword(s):  
Ethylenic Bond ◽  
Intramolecular Amidation

Recherches sur les composés éthyléniques. V. Liens entre la structure des akènes et leur fréquence de vibration νC = C influence des effets structuraux et établissement d'une relation de topo-information

1975 ◽  
Vol 53 (17) ◽  
pp. 2580-2585 ◽  
Author(s):  
J. H. Basso ◽  
S. Delattre ◽  
R. Lanteri ◽  
R. Luft
Keyword(s):  
Quantitative Analysis ◽  
Spectroscopic Data ◽  
Chemical Method ◽  
Molecular Conformation ◽  
Ethylenic Bond ◽  
The Relationship ◽  
Steric Constraint

An examination of spectroscopic data for 43 alkenes reveals the influence of increasing substitution at the carbon atoms α or β to the ethylenic bond. The presence of a particularly large steric constraint requires that there be a single preferred molecular conformation: in such a case the frequency of the νC = C vibrator is strongly decreased (10 cm−1).A quantitative analysis of the phenomenon can be achieved using the "topological-chemical method D.A.R.C.". Topologic-information relationships could be developed for the two series 2-alkylethylenes and 2,2-dialkylethylenes. These permit the calculation of the contribution of each topological site to the frequency νC = C. For the first series, the relationship, based on 9 compounds, permits predictions about 30 others. For the second series, deductions are made concerning 159 compounds from a relationship established on a base of 13 compounds. [Journal translation]

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