Flavonones and Related Compounds. V. The Oxidation of 2'-Hydroxychalcones with Alkaline Hydrogen Peroxide

1948 ◽  
Vol 70 (5) ◽  
pp. 1686-1689 ◽  
Author(s):  
T. A. Geissman ◽  
David K. Fukushima
Keyword(s):  
Hydrogen Peroxide ◽  
Alkaline Hydrogen Peroxide ◽  
Related Compounds

The Structure and Function of Oestrogens. II. The Synthesis and Oestrogenic Activity of 4b-Methyl 4b,5,6,12-tetrahydrochrysene-2,8-diol and 4b-Methyl-cis-4b,5,6,10b,11,12-hexahydrochrysene-2,8-diol and Related Compounds

1979 ◽  
Vol 32 (5) ◽  
pp. 1107 ◽  
Author(s):  
DJ Collins ◽  
WA Matthews ◽  
GM Stone
Keyword(s):  
Hydrogen Peroxide ◽  
Structure And Function ◽  
Lithium Aluminium Hydride ◽  
Alkaline Hydrogen Peroxide ◽  
Lithium Aluminium ◽  
Methylmagnesium Iodide ◽  
And Function ◽  
Dihydroxy Compound ◽  
Related Compounds

Hydroboration of an inseparable mixture of 2,8-dimethoxy-5,6-dihydrochrysene (5a) and 2,8-dimethoxy-4b-methyl-4b,5,6,12-tetrahydrochrysene (6a) followed by oxidation with alkaline hydrogen peroxide gave a mixture of (4bα,10bβ,11β)-2,8-dimethoxy-4b-methyl-4b,5,6,10a,11,12-hexahydrochrysen-11-ol (10a) and its (4bβ,10bβ,11β) isomer(11a). Reduction of the methanesulfonate ester of (10a) with lithium aluminium hydride in ether gave 2,8-dimethoxy-4b-methyl-trans-4b,5,6,10b,11,12- hexahydrochrysene (2b), identical with material prepared by another route. Reduction of the methanesulfonate of (4bβ,10bβ,l1β)-2,8-dimethoxy-4b-methyl-4b,5,6,10a,11,12-hexahydrochrysen- 11-ol afforded 2,8-dimethoxy-4b-methyl-cis-4b,5,6,10b,11,12-hexahydrochrysene (12), demethylation of which afforded 4b-methyl-cis-4b,5,6,10b,11,12-hexahydrochrysene-2,8-diol (14b). Dehydration of the mixture of the 11-epimeric alcohols (10a) and (lla) with phosphorus oxytrichloride in pyridine yielded pure 2,8-dimethoxy-4b-methyl-4b,5,6,12-tetrahydrochrysene (6a) which was demethylated with methylmagnesium iodide to give the corresponding dihydroxy compound (9). Other compounds prepared in the course of examining possible routes to (9) and (14b) include 13,13-dichloro-2,8-dimethoxy-4b,5,6,10b,11,12-hexahydro-4b,10b-methanoch rysene (3a), 1-bromo- 2,8-dimethoxy-5,6-dihydrochrysene (5b), and 11-bromo-2,8-dimethoxy-4b-methy1-4b,5,6,12-tetra- hydrochrysene (7). The oestrogenic activities of some of the new angularly methylated hydrochrysenes and of 9α- methyloestradiol (15) are reported.

The behavior of chromophoric structures in softwood mechanical pulp on bleaching with alkaline hydrogen peroxide

2006 ◽  
Vol 21 (3) ◽  
pp. 359-364 ◽  
Author(s):  
Eva Svensson Rundlöf ◽  
Eric Zhang ◽  
Liming Zhang ◽  
Göran Gellerstedt
Keyword(s):  
Hydrogen Peroxide ◽  
Alkaline Hydrogen Peroxide ◽  
Mechanical Pulp

scholarly journals Characterizing Wool Keratin

2009 ◽  
Vol 2009 ◽  
pp. 1-5 ◽  
Author(s):  
Jeanette M. Cardamone ◽  
Alberto Nuñez ◽  
Rafael A. Garcia ◽  
Mila Aldema-Ramos
Keyword(s):  
Hydrogen Peroxide ◽  
Gel Electrophoresis ◽  
Water Soluble ◽  
Alkaline Solutions ◽  
Biodegradable Material ◽  
Alkaline Hydrogen Peroxide ◽  
Cortical Cells ◽  
Sds Page ◽  
Fibrous Matrices ◽  
Wool Keratin

Keratin from wool is a reactive, biocompatible, and biodegradable material. As the biological structural component of skin (soft keratins) and of nails, claws, hair, horn, feathers, and scales (hard keratins) pure keratin comprises up to 90% by weight of wool. Wool was treated in alkaline solutions to extract from 68% to 82% keratin within 2 to 5 hours of exposure at . The keratin products were water-soluble and were confirmed to contain intermediate filament and microfibrillar component-proteins of fractured, residual cuticle, and cortical cells. Oxidation of wool by peroxycarboximidic acid in alkaline hydrogen peroxide produced keratin products with distinct microcrystalline structures: descaled fibers, fibrous matrices, and lyophilized powders. Morphology and confirmation of peptide functionality were documented by SEM, Amino Acid Analysis, SDS-PAGE gel electrophoresis, MALDI-TOF/TOF, and FTIR analyses. The reactivity of keratin from wool models the reactivity of keratin from low-value sources such as cattle hair.

Titanium Corrosion in Alkaline Hydrogen Peroxide

CORROSION ◽  
2000 ◽  
Vol 56 (8) ◽  
pp. 809-818 ◽  
Author(s):  
J. Been ◽  
D. Tromans
Keyword(s):  
Hydrogen Peroxide ◽  
Alkaline Hydrogen Peroxide

scholarly journals Mechanistic insights into the bleaching of melanin by alkaline hydrogen peroxide

2017 ◽  
Vol 108 ◽  
pp. 110-117 ◽  
Author(s):  
R.A.W. Smith ◽  
B. Garrett ◽  
K.R. Naqvi ◽  
A. Fülöp ◽  
S.P. Godfrey ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Alkaline Hydrogen Peroxide

Effects of alkaline, hydrogen peroxide-treated fibres on nutrient digestibility, blood sugar and lipid profile in rats

1999 ◽  
Vol 65 (2) ◽  
pp. 213-218 ◽  
Author(s):  
R.A Al-Shagrawi ◽  
M.O Al-Ojayan ◽  
M.A Sadek ◽  
I.E Al-Shayeb ◽  
I.M Al-Ruqaie
Keyword(s):  
Hydrogen Peroxide ◽  
Lipid Profile ◽  
Blood Sugar ◽  
Nutrient Digestibility ◽  
Alkaline Hydrogen Peroxide
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