Selective chromic acid oxidation of alternariol trimethyl ether; X-ray crystal structure of the major product

1973 ◽  
pp. 333 ◽  
Author(s):  
Mark F. C. Ladd ◽  
David C. Povey ◽  
Robert Thomas
Keyword(s):  
Crystal Structure ◽  
Chromic Acid ◽  
Major Product ◽  
Acid Oxidation ◽  
X Ray ◽  
Chromic Acid Oxidation ◽  
Trimethyl Ether

THE RUBBER HYDROCARBON OF ASCLEPIAS SYRIACA L.

1943 ◽  
Vol 21b (10) ◽  
pp. 219-223 ◽  
Author(s):  
E. B. Paul ◽  
A. L. Blakers ◽  
R. W. Watson
Keyword(s):  
Molecular Weight ◽  
Chromic Acid ◽  
Acid Oxidation ◽  
Low Molecular Weight ◽  
X Ray Diffraction ◽  
Asclepias Syriaca ◽  
X Ray ◽  
Chromic Acid Oxidation ◽  
Gutta Percha ◽  
Diffraction Diagram

Milkweed latex collected in mid-July was coagulated in acetone, the coagulum purified, and the rubber examined by chemical and X-ray diffraction methods. Chromic acid oxidation analyses indicate that the monomer is isoprene. The X-ray evidence verifies these results and, further, fixes the polymer as the cis-configuration (rubber) as opposed to the trans-configuration (gutta-percha) of polyisoprene.The solvent-extracted rubber from the leaves appears from the chromic acid oxidation results to be isoprene, but so far no polyisoprene diffraction diagram has been obtained. It is therefore likely that the solvent-extracted leaf rubber is an isoprene polymer of low molecular weight.

Some oxidation products of lycoctonine revisited

2006 ◽  
Vol 84 (9) ◽  
pp. 1167-1173 ◽  
Author(s):  
Doaa Abdelrahman ◽  
Michael Benn ◽  
Ryan Hellyer ◽  
Masood Parvez ◽  
Oliver E Edwards
Keyword(s):  
Oxidation Product ◽  
Chromic Acid ◽  
Oxidation Products ◽  
Acid Oxidation ◽  
Lithium Aluminium Hydride ◽  
X Ray ◽  
X Ray Crystallography ◽  
Chromic Acid Oxidation ◽  
Lithium Aluminium ◽  
Norditerpenoid Alkaloid

The structure of a chromic acid oxidation product of the norditerpenoid alkaloid lycoctonine (1) was established as hydroxylycoctonal (3) by spectrometric analyses and X-ray crystallography of its reduction product, hydroxylycoctonine (5); the structure of lycoxonine, a chromic acid oxidation product of the lactam, lycoctonam (7), was similarly confirmed as N-ethyl-4,7,8-trihydroxy-1α,6β,14α,16β-tetramethoxy-19-oxoaconitane (8). Reduction of lycoxonine with lithium aluminium hydride gave the 1,14-di-O-methyl ether (12) of the bisnorditerpenoid alkaloid delbine (9).Key words: norditerpenoid, bisnorditerpenoid, alkaloids, lycoctonine, lycoctonam, hydroxylycoctonal, lycoxonine. 1,14-di-O-methyldelbine, semisynthesis.

The kinetics of the chromic acid oxidation of diphenylmethane

Tetrahedron ◽  
1960 ◽  
Vol 8 (3-4) ◽  
pp. 313-335 ◽  
Author(s):  
K.B. Wiberg ◽  
R.J. Evans
Keyword(s):  
Chromic Acid ◽  
Acid Oxidation ◽  
Chromic Acid Oxidation ◽  
Kinetics Of
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