ChemInform Abstract: Synthesis of Nucleosides and Related Compounds. Part 37. Selective Protection of the Primary Hydroxyl Groups of Oxetanocin A and Conformationl Analysis of O-Protected Oxetanocin A.

ChemInform ◽  
2010 ◽  
Vol 26 (45) ◽  
pp. no-no
Author(s):  
N. KATAGIRI ◽  
M. MAKINO ◽  
C. KANEKO
Keyword(s):  
Hydroxyl Groups ◽  
Selective Protection ◽  
Primary Hydroxyl ◽  
Related Compounds

STUDIES ON LIGNIN AND RELATED COMPOUNDS: XXII. FRACTIONATION OF METHANOL LIGNIN

1936 ◽  
Vol 14b (4) ◽  
pp. 115-119
Author(s):  
Jack Compton ◽  
Margaret Greig ◽  
Harold Hibbert
Keyword(s):  
Pure State ◽  
Soluble Fraction ◽  
Hydroxyl Groups ◽  
Related Compounds

Preparation of methanol lignin by the method of Brauns and Hibbert on a larger scale than that employed previously has disclosed the presence of a second fraction, soluble in ether-dioxane. The original methanol lignin and this new fraction are obtained in a pure state by fractionation with dioxane and benzene. The former has been shown to correspond to the methanol lignin from which the Brauns and Hibbert formula C42H32O6(OCH3)6(OH)4 was derived. The benzene-dioxane–soluble fraction has been methylated and acetylated, and shown to have a different composition, the ratio of methoxyl to hydroxyl groups being 5:3.

STUDIES ON LIGNIN AND RELATED COMPOUNDS: XXIX. A STUDY OF THE ACIDIC HYDROXYL GROUPS IN SPRUCE LIGNIN

1937 ◽  
Vol 15b (12) ◽  
pp. 532-535 ◽  
Author(s):  
R. G. D. Moore ◽  
George F. Wright ◽  
Harold Hibbert
Keyword(s):  
Phenolic Content ◽  
Hydriodic Acid ◽  
Hydroxyl Groups ◽  
Aromatic Content ◽  
Related Compounds

A demethylated spruce lignin suitable for further study has been obtained by treating methylated methanol lignin with hydriodic acid. This treatment removes the aliphatic hydroxyl, and leaves 6.9 aromatic and 0.6 carboxylic hydroxyl groups per kg. On the basis of the phenolic content it is estimated that the maximum aromatic content of spruce lignin is about 40 to 45%.

scholarly journals A Synthetic Strategy for Conjugation of Paromomycin to Cell-Penetrating Tat(48-60) for Delivery and Visualization into Leishmania Parasites

2017 ◽  
Vol 2017 ◽  
pp. 1-7 ◽  
Author(s):  
Sira Defaus ◽  
Maria Gallo ◽  
María A. Abengózar ◽  
Luis Rivas ◽  
David Andreu
Keyword(s):  
Aminoglycoside Antibiotic ◽  
Cell Penetrating Peptides ◽  
Hydroxyl Groups ◽  
Selective Protection ◽  
Synthetic Strategy ◽  
Cell Penetrating ◽  
Successful Approach ◽  
Leishmania Parasites

A successful approach to deliver paromomycin, a poorly absorbed aminoglycoside antibiotic, to parasite cells is reported, based on selective protection of amino and hydroxyl groups followed by conjugation to a fluorolabeled, PEG-functionalized cell-penetrating Tat(48-60) peptide. The resulting construct is efficiently internalized into Leishmania cells, evidencing the fitness of cell-penetrating peptides as vectors for efficiently transporting low-bioavailability drugs into cells.

scholarly journals An efficient partial synthesis of 4′-O-methylquercetin via regioselective protection and alkylation of quercetin

2009 ◽  
Vol 5 ◽  
Author(s):  
Nian-Guang Li ◽  
Zhi-Hao Shi ◽  
Yu-Ping Tang ◽  
Jian-Ping Yang ◽  
Jin-Ao Duan
Keyword(s):  
Diphenyl Ether ◽  
Hydroxyl Groups ◽  
Partial Synthesis ◽  
Selective Protection ◽  
Catechol Group

An efficient partial 5-step synthesis of 4′-O-methylquercetin from quercetin in 63% yield is reported. This strategy relies on the selective protection of the catechol group with dichlorodiphenylmethane in diphenyl ether as solvent and on the selective protection of the hydroxyl groups at positions 3 and 7 with chloromethyl ether.

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