34338-82-4Relevant academic research and scientific papers
Reactivity of vinyl ethers and vinyl ribosides in UV-initiated free radical copolymerization with acceptor monomers
Pichavant, Loic,Guillermain, Ce Line,Coqueret, Xavier
scheme or table, p. 2415 - 2421 (2012/10/18)
The reactivity of various vinyl ethers and vinyloxy derivatives of ribose in the presence of diethyl fumarate or diethyl maleate was investigated for evaluating the potential of donor-acceptor-type copolymerization applied to unsaturated monomers derived from renewable feedstock. The photochemically induced polymerization of model monomer blends in the bulk state was monitored by infrared spectroscopy. The method allowed us to examine the influence of monomer pair structure on the kinetic profiles. The simultaneous consumption of both monomers was observed, supporting an alternating copolymerization mechanism. A lower reactivity of the blends containing maleates compared with fumarates was confirmed. The obtained kinetic data revealed a general correlation between the initial polymerization rate and the Hansen parameter aeH associated with the H-bonding aptitude of the donor monomer.
Preparation of Some Partially Methylated L-Rhamnosides and D-Ribosides
Batavyal, Lakshmi,Roy, Nirmolendu
, p. 499 - 500 (2007/10/02)
Partially methylated L-rhamnosides and D-ribosides have been prepared using limited amounts (25 to 35percent less than that needed for complete methylation) of methylating reagents, and characterized by GLC or GLC/MS.Methyl 2,3-di-O-methyl-α-L-rhamnoside has also been prepared by a modified method of Hough and Jones .
OXIDATION OF 2,3,4,6-TETRA-O-METHYL-D-GLUCOSE WITH ALKALINE HYDROGEN PEROXIDE
Salam, Mohammed A.,Isbell, Horace S.
, p. 253 - 262 (2007/10/02)
Treatment of 2,3,4,6-tetra-O-methyl-D-glucose with 10 molar equivalents of 30percent aqueous hydrogen peroxide and 2 molar equivalents of potassium hydroxide afforded, after chromatographic separation, 2,3,4,6-tetra-O-methyl-D-gluconolactone, 1-O-formyl-2,3,5-tri-O-methyl-D-arabinose methyl hemiacetal (7), 2,3,5-tri-O-methyl-D-arabinonolactone, methyl 2,3,5-tri-O-methyl-D-arabinoside, O-(2,4-di-O-methyl-D-erythrose)-(1'3)-2,4-di-O-methyl-D-erythronic acid, and O-(2,4-di-O-methyl-D-erythrose)-(1'2)-3-O-methyl-D-glyceraldehyde.The proportions of the products depended on the reaction conditions, especially the time, temperature, and the presence or absence of magnesium hydroxide.Formation of the products is explained by a series of reactions beginning with the addition of hydrogen peroxide to the carbonyl form of the methylated sugar.The adduct, with the help of superoxide radical and a molecule of hydrogen peroxide, breaks up in two ways, giving 2,3,4,6-tetra-O-methyl-D-gluconic acid and 7.The formic ester, on hydrolysis, gives 2,3,5-tri-O-methyl-D-arabinose, which undergoes a similar series of reactions, affording 2,3,5-tri-O-methyl-D-arabinonic acid, and presumably, 1-O-formyl-2,4-di-O-methyl-D-erythrose methyl hemiacetal.Apparently, the latter compound, on hydrolysis, forms a dimer, which, with alkaline hydrogen peroxide, undergoes a similar series of reactions, ultimately affording O-(2,4-di-O-methyl-D-erythrose)-(13)-2,4-di-O-methyl-D-erythronic acid and O-(2,4-di-O-methyl-D-erythrose)-(12)-3-O-methyl-D-glyceraldehyde.With a larger amount of alkali, under more-severe conditions, oxidation of 2,3,4,6-tetra-O-methyl-D-glucose proceeds further, with production of up to 3 moles of formic acid per mole of methylated sugar.
