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Statements

Subject Item
n2:RIV%2F60461373%3A22330%2F04%3A00012832%21RIV%2F2005%2FMSM%2F223305%2FN
rdf:type
skos:Concept n17:Vysledek
dcterms:description
The kinetics of methylation of methyl 5-deoxy-?-D-xylofuranoside (1), methyl 5-deoxy-ß-D-xylofuranoside (2) and their partly methylated derivatives with methyl iodide in the presence of sodium hydroxide in acetonitrile was studied. The reaction rate was independent of the base concentration during the first half-time only and the methylation proceeded as a first-order reaction. The rate constants of all side and consecutive reactions were calculated and the influence of both polar and steric effect is discussed. The methylation of 1 was highly regioselective giving almost exclusively 5-deoxy-2-O-methyl-?-D-xylofuranoside. Byla sledována kinetika methylace methyl-5-deoxy-?-D-xylofuranosidu, methyl-5-deoxy-ß-D-xylofuranosidu a jejich methyletherů methyljodidem v acetonitrilu za přítomnosti hydroxidu sodného. Byly spočítány rychlostní konstanty všech následných a konkurenčních reakcí a vyhodnoceny sterické a polární vlivy. The kinetics of methylation of methyl 5-deoxy-?-D-xylofuranoside (1), methyl 5-deoxy-ß-D-xylofuranoside (2) and their partly methylated derivatives with methyl iodide in the presence of sodium hydroxide in acetonitrile was studied. The reaction rate was independent of the base concentration during the first half-time only and the methylation proceeded as a first-order reaction. The rate constants of all side and consecutive reactions were calculated and the influence of both polar and steric effect is discussed. The methylation of 1 was highly regioselective giving almost exclusively 5-deoxy-2-O-methyl-?-D-xylofuranoside.
dcterms:title
Kinetika methylace methyl 5-deoxy- / -D-xylofuranosidů Kinetics of methylation of methyl 5-deoxy- / -D-xylofuranosides Kinetics of methylation of methyl 5-deoxy- / -D-xylofuranosides
skos:prefLabel
Kinetics of methylation of methyl 5-deoxy- / -D-xylofuranosides Kinetika methylace methyl 5-deoxy- / -D-xylofuranosidů Kinetics of methylation of methyl 5-deoxy- / -D-xylofuranosides
skos:notation
RIV/60461373:22330/04:00012832!RIV/2005/MSM/223305/N
n3:strany
1877-1888
n3:aktivita
n10:Z
n3:aktivity
Z(MSM 223300006)
n3:cisloPeriodika
69
n3:dodaniDat
n15:2005
n3:domaciTvurceVysledku
n7:1851403
n3:druhVysledku
n18:J
n3:duvernostUdaju
n6:S
n3:entitaPredkladatele
n11:predkladatel
n3:idSjednocenehoVysledku
570097
n3:idVysledku
RIV/60461373:22330/04:00012832
n3:jazykVysledku
n13:eng
n3:klicovaSlova
Regioselectivity;Rate constants;Partial methylation;Methyl pentofuranoside;
n3:klicoveSlovo
n4:Regioselectivity n4:Methyl%20pentofuranoside n4:Partial%20methylation n4:Rate%20constants
n3:kodStatuVydavatele
CZ - Česká republika
n3:kontrolniKodProRIV
[5BFFC1603C8C]
n3:nazevZdroje
Collection of Czechoslovak Chemical Communications
n3:obor
n14:CC
n3:pocetDomacichTvurcuVysledku
1
n3:pocetTvurcuVysledku
2
n3:rokUplatneniVysledku
n15:2004
n3:svazekPeriodika
Neuveden
n3:tvurceVysledku
Oščendová, M. Moravcová, Jitka
n3:zamer
n9:MSM%20223300006
s:issn
0010-0765
s:numberOfPages
12
n12:organizacniJednotka
22330