About: NOVEL SYNTHESIS AND REACTIONS OF PENTAMETHINIUM DYES WITH AROMATIC SUBSTITUENTS IN 1,3 AND 5 OR 1 AND 5 POSITIONS

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
Description	Our improved synthetic approach is based on the reaction of appropriate pyrylium perchlorates with N,N-dialkyltrimethylsilylamines. The reaction is quite simple to handle, good yields of pentamethinium salts are obtained. A series of pentamethinium dyes was synthesized in this manner. Dependence of the UV-VIS absorption maximum of pentamethines on the substitution was studied. Bromination and chlorination of selected pentamethines was carried out yielding halogenated derivatives with significant bathochromic shifts of absorption maxima. In comparison with other pentamethinium salts 1,5-bis(dimethylamino)-1,3,5-triphenylpentamethinium-perchlorate and its analogues very easily undergo cyclization reaction with ammonia, perhaps due to an increased sterichindrance resulting into a %22bent%22 conformation. Hardly accessible pyridine derivatives were prepared in this fashion. Our improved synthetic approach is based on the reaction of appropriate pyrylium perchlorates with N,N-dialkyltrimethylsilylamines. The reaction is quite simple to handle, good yields of pentamethinium salts are obtained. A series of pentamethinium dyes was synthesized in this manner. Dependence of the UV-VIS absorption maximum of pentamethines on the substitution was studied. Bromination and chlorination of selected pentamethines was carried out yielding halogenated derivatives with significant bathochromic shifts of absorption maxima. In comparison with other pentamethinium salts 1,5-bis(dimethylamino)-1,3,5-triphenylpentamethinium-perchlorate and its analogues very easily undergo cyclization reaction with ammonia, perhaps due to an increased sterichindrance resulting into a %22bent%22 conformation. Hardly accessible pyridine derivatives were prepared in this fashion. (en)
Title	NOVEL SYNTHESIS AND REACTIONS OF PENTAMETHINIUM DYES WITH AROMATIC SUBSTITUENTS IN 1,3 AND 5 OR 1 AND 5 POSITIONS NOVEL SYNTHESIS AND REACTIONS OF PENTAMETHINIUM DYES WITH AROMATIC SUBSTITUENTS IN 1,3 AND 5 OR 1 AND 5 POSITIONS (en)
skos:prefLabel	NOVEL SYNTHESIS AND REACTIONS OF PENTAMETHINIUM DYES WITH AROMATIC SUBSTITUENTS IN 1,3 AND 5 OR 1 AND 5 POSITIONS NOVEL SYNTHESIS AND REACTIONS OF PENTAMETHINIUM DYES WITH AROMATIC SUBSTITUENTS IN 1,3 AND 5 OR 1 AND 5 POSITIONS (en)
skos:notation	RIV/60461373:22310/03:00008260!RIV/2004/MSM/223104/N
http://linked.open.../vavai/riv/strany	170
http://linked.open...avai/riv/aktivita	Z
http://linked.open...avai/riv/aktivity	Z(MSM 223100001)
http://linked.open...vai/riv/dodaniDat	2004
http://linked.open...aciTvurceVysledku	Böhm, Stanislav Rybáčková, Markéta
http://linked.open.../riv/druhVysledku	D - Článek ve sborníku
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 chemické technologie
http://linked.open...dnocenehoVysledku	618438
http://linked.open...ai/riv/idVysledku	RIV/60461373:22310/03:00008260
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	pentamethinium salts; synthesis; pyrylium perchlorates; N,N-dialkyltrimethylsilylamines (en)
http://linked.open.../riv/klicoveSlovo	N N-dialkyltrimethylsilylamines pentamethinium salts pyrylium perchlorates synthesis
http://linked.open...ontrolniKodProRIV	[F2368B84D3A9]
http://linked.open...v/mistoKonaniAkce	Wien
http://linked.open...i/riv/mistoVydani	Wien
http://linked.open...i/riv/nazevZdroje	10th Blue Danube Symposium on Heterocyclic Chemistry
http://linked.open...in/vavai/riv/obor	CC
http://linked.open...ichTvurcuVysledku	2 (xsd:int)
http://linked.open...cetTvurcuVysledku	2 (xsd:int)
http://linked.open...ocetUcastnikuAkce	0 (xsd:int)
http://linked.open...nichUcastnikuAkce	0 (xsd:int)
http://linked.open...UplatneniVysledku	2003
http://linked.open...iv/tvurceVysledku	Böhm, Stanislav Rybáčková, Markéta
http://linked.open...vavai/riv/typAkce	EUR - Evropská
http://linked.open.../riv/zahajeniAkce	2003-09-03 (xsd:date)
http://linked.open...n/vavai/riv/zamer	http://linked.opendata.cz/resource/domain/vavai/zamer/MSM%20223100001
number of pages	1 (xsd:int)
http://purl.org/ne...btex#hasPublisher	The Tenth Blue Danube Symposium on Heterocyclic Chemistry
https://schema.org/isbn	80-227-1938-2
http://localhost/t...ganizacniJednotka	22310

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