STUDIES ON CHLOROBIUM CHLOROPHYLLS: II. THE RESOLUTION OF OXIDATION PRODUCTS OF CHLOROBIUM PHEOPHORBIDE (660) BY GAS–LIQUID PARTITION CHROMATOGRAPHY

1961 ◽  
Vol 39 (4) ◽  
pp. 755-760 ◽  
Author(s):  
H. V. Morley ◽  
A. S. Holt
Keyword(s):  
Chromic Acid ◽  
Oxidation Products ◽  
Acid Oxidation ◽  
Partition Chromatography ◽  
Chromic Acid Oxidation

Methylethylmaleimide, methyl-n-propyl maleimide, and dihydrohematinic acid imide are obtained from Chlorobium pheophorbide (660) on chromic acid oxidation. The separation and isolation of these products and of other imides and pyrroles by gas–liquid partition chromatography is described.

scholarly journals Chromic Acid Oxidation of Coal (II) Oxidation Products

1972 ◽  
Vol 51 (6) ◽  
pp. 344-353
Author(s):  
Nobuaki Fujiwara ◽  
Futoru Yoshimura
Keyword(s):  
Chromic Acid ◽  
Oxidation Products ◽  
Acid Oxidation ◽  
Chromic Acid Oxidation

STUDIES OF CHLOROBIUM CHLOROPHYLLS: IV. PREPARATIVE LIQUID–LIQUID PARTITION CHROMATOGRAPHY OF PORPHYRINS AND CHLOROPHYLL DERIVATIVES AND ITS USE TO RESOLVE CHLOROBIUM PHEOPHORBIDE (650) INTO SIX COMPONENTS

1962 ◽  
Vol 40 (2) ◽  
pp. 171-176 ◽  
Author(s):  
D. W. Hughes ◽  
A. S. Holt
Keyword(s):  
Hydrochloric Acid ◽  
Absorption Spectra ◽  
Chromic Acid ◽  
Acid Oxidation ◽  
Partition Chromatography ◽  
Visible Absorption ◽  
Preparative Scale ◽  
Chromic Acid Oxidation ◽  
Chlorophyll Derivatives

Various porphyrins and chlorophyll derivatives have been purified on a preparative scale by distribution between hydrochloric acid and ether on Celite columns. By this technique crude Chlorobium pheophorbide (650) was resolved into six components, which possessed almost identical visible absorption spectra, but slightly different acid distribution numbers. Chromic acid oxidation and subsequent gas–liquid partition chromatography of the neutral fractions indicate the presence of more than one Chlorobium chlorophyll (650) in the original pigment preparation.

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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