ChemInform Abstract: A Useful Method for the Selective Reduction of Isoxazoline Nuclei in the Presence of Double Bonds by the Use of Lindlar Catalyst.

ChemInform ◽  
2010 ◽  
Vol 27 (30) ◽  
pp. no-no
Author(s):  
S. H. JUNG ◽  
E. K. LEE ◽  
H. J. SUNG ◽  
S. O. KIM
Keyword(s):  
Selective Reduction ◽  
Double Bonds ◽  
Lindlar Catalyst

Homogeneous hydrogenation and deuteration of pentacyclic triterpenoids: Double bonds in side-chains

1981 ◽  
Vol 46 (11) ◽  
pp. 2734-2741 ◽  
Author(s):  
Jiří Protiva ◽  
Luděk Lepša ◽  
Eva Klinotová ◽  
Jiří Klinot ◽  
Václav Křeček ◽  
...  
Keyword(s):  
Selective Reduction ◽  
Side Chains ◽  
Double Bonds ◽  
Homogeneous Hydrogenation ◽  
Pentacyclic Triterpenoids ◽  
Rhodium Chloride

The reduction of terminal double bonds in the side chains on the rings A and E of pentacyclic triterpenoids by means of tris(triphenylphosphine)rhodium chloride permits selective reduction of dienes and labelling with deuterium with a low scattering. The effect of the amount of the catalyst and the solvent used on the rate of reduction was studied in the case of 3β,28-diacetylbetulin.

Tritium labelling and tritium N.M.R. II. Labelled methyl (Z)-Octadec-9-enoate obtained by partial hydrogenation on Lindlar catalyst, and its reduction to(Z)-Octadec-9-en-1-ol

1982 ◽  
Vol 35 (8) ◽  
pp. 1615 ◽  
Author(s):  
AL Odell ◽  
KJ Ronaldson ◽  
RW Martin ◽  
DJ Calvert
Keyword(s):  
Chemical Shift ◽  
Finite Difference ◽  
Isotope Effect ◽  
Coupling Constants ◽  
Partial Hydrogenation ◽  
Double Bonds ◽  
Proton Proton ◽  
Proton Coupling ◽  
Lindlar Catalyst

The selectivity of tritium labelling of double bonds by partial hydrogenation of the acetylenic analogue on Lindlar catalyst is investigated by 3H and 13C n.m.r. Examples of both the secondary isotope effect on chemical shift and the usefulness of 3H n.m.r, measurements to calculate proton-proton coupling constants are described. In the absence of proton coupling a finite difference (0.014 ppm) in the chemical shift of tritons at positions 9 and 10 of methyl (Z)-[9,10-3H]octadec-9-enoate is observed.

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