About: Kinetics of methylation of methyl 5-deoxy- / -D-xylofuranosides

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
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. 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. (en) 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. (cs)
Title	Kinetika methylace methyl 5-deoxy- / -D-xylofuranosidů (cs) Kinetics of methylation of methyl 5-deoxy- / -D-xylofuranosides Kinetics of methylation of methyl 5-deoxy- / -D-xylofuranosides (en)
skos:prefLabel	Kinetika methylace methyl 5-deoxy- / -D-xylofuranosidů (cs) Kinetics of methylation of methyl 5-deoxy- / -D-xylofuranosides Kinetics of methylation of methyl 5-deoxy- / -D-xylofuranosides (en)
skos:notation	RIV/60461373:22330/04:00012832!RIV/2005/MSM/223305/N
http://linked.open.../vavai/riv/strany	1877-1888
http://linked.open...avai/riv/aktivita	Z
http://linked.open...avai/riv/aktivity	Z(MSM 223300006)
http://linked.open...iv/cisloPeriodika	69
http://linked.open...vai/riv/dodaniDat	2005
http://linked.open...aciTvurceVysledku	Moravcová, Jitka
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Vysoká škola chemicko-technologická v Praze / Fakulta potravinářské a biochemické technologie
http://linked.open...dnocenehoVysledku	570097
http://linked.open...ai/riv/idVysledku	RIV/60461373:22330/04:00012832
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	Regioselectivity;Rate constants;Partial methylation;Methyl pentofuranoside; (en)
http://linked.open.../riv/klicoveSlovo	Regioselectivity Methyl pentofuranoside Partial methylation Rate constants
http://linked.open...odStatuVydavatele	CZ - Česká republika
http://linked.open...ontrolniKodProRIV	[5BFFC1603C8C]
http://linked.open...i/riv/nazevZdroje	Collection of Czechoslovak Chemical Communications
http://linked.open...in/vavai/riv/obor	CC
http://linked.open...ichTvurcuVysledku	1 (xsd:int)
http://linked.open...cetTvurcuVysledku	2 (xsd:int)
http://linked.open...UplatneniVysledku	2004
http://linked.open...v/svazekPeriodika	Neuveden
http://linked.open...iv/tvurceVysledku	Moravcová, Jitka Oščendová, M.
http://linked.open...n/vavai/riv/zamer	http://linked.opendata.cz/resource/domain/vavai/zamer/MSM%20223300006
issn	0010-0765
number of pages	12 (xsd:int)
http://localhost/t...ganizacniJednotka	22330

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