Výsledky vyhledávání - "Ivan G. Pojarlieff"

Autoxidation of a 4-iminoimidazolidin-2-one with a tertiary 5-hydrogen to its 5-hydroxy derivative

Autor: Anne-Sophie Chauvin, Nikolay G. Vassilev, Asen H. Koedjikov, Ivan G. Pojarlieff, Violina T. Angelova, Petko M. Ivanov

Publikováno v: ARKIVOC, Vol 2008, Iss 11, Pp 11-23 (2008)

Chemoselective autoxidation of 4-imino-1,5-dimethyl-3-(4-nitrophenyl) imidazolidin-2-one (1b) to its 5-hydroxy derivative 2 occurred in solutions of DMSO-d(6), acetonitrile-d(3) or refluxing ethanol. Also bis(imidazolidin-5-yl) peroxide 5 was isolate

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a037269c35f042f55e7eee0019f6a043
https://www.arkat-usa.org/arkivoc-journal/browse-arkivoc/ark.5550190.0009.b02

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Acid catalyzed intramolecular attack of β-phenylthioureido group on amide function. Parallel formation of thiodihydrouracil and 4-iminothiodihydrouracil. Different pathways in the Edman degradation reaction in the formation of six- versus five-membered cy

Autor: Ivan G. Pojarlieff, Violina T. Angelova, Nikolay G. Vassilev, Ergun Atay, Maria M. Toteva, Iva B. Blagoeva, Asen H. Koedjikov

Publikováno v: Journal of Physical Organic Chemistry. 21:14-22

Contrary to the cleavage of a-phenylthioureido peptides 1 proceeding through intermediate 2-anilinothiazolinone 2, the b-analog cis-2-(3-phenylthioureido)cyclopentane-carboxamide 5 forms transiently 4-imino-2-thioxopyrimidine 6. Monitoring amide cycl

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::07dfe53f8f2ce5dc14a0ca558ce620f2
https://doi.org/10.1002/poc.1269

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A largegem-dimethyl effect in the cyclization ofω-phenylhydantoic acids: computational modeling of thegem-dimethyl effect on the acid- or base-catalyzed cyclization of hydantoic acids and esters

Autor: Asen H. Koedjikov, Carlos Jaime, Iva B. Blagoeva, V. T. Angelova, Ivan G. Pojarlieff, Petko M. Ivanov

Publikováno v: Journal of Physical Organic Chemistry. 17:423-430

The rates of the cyclization of methyl-substituted 5-phenylhydantoic acids were measured in acid solutions. A particularly strong gem-dimethyl effect (GDME) was observed with the N-methyl compounds amounting to an acceleration of six powers of ten fo

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::49c079c1f0155f9a0cd855c86995350e
https://doi.org/10.1002/poc.748

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The role of micelles of multiblock copolymers of ethylene oxide and propylene oxide in ion transport during acid bright copper electrodeposition

Autor: Vera Mircheva, Jaroslav Stejskal, Nadya Tabakova, Ivan G. Pojarlieff

Publikováno v: Macromolecular Symposia. 212:467-472

The role of micelle formation in the levelling activity of electrolytes for copper electrodeposition was investigated. It was established that micelle formation in the electrolytes caused a dramatic increase in the degree of levelling. The effect tak

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::99edab04a7b54fdfb9f5fadc93ac9f20
https://doi.org/10.1002/masy.200450859

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Thorpe–Ingold effects in cyclizations to five-membered and six-membered rings containing planar segments. The rearrangement of N(1)-alkyl-substituted dihydroorotic acids to hydantoinacetic acids in base

Autor: Jose Kaneti, Anthony J. Kirby, Asen H. Koedjikov, Ivan G. Pojarlieff

Publikováno v: Org. Biomol. Chem.. 2:1098-1103

While the gem-dimethyl effect (GDME) is quantitatively similar for cyclizations to cyclopentane and cyclohexane rings and their homomorphs, in systems containing planar segments the GDME is stronger for the formation of five-membered rings. Planar pe

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::28ca39567d8dd90b1a581956f8b74fb1
https://doi.org/10.1039/b400248b

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σI Values for Arylureido Groups

Autor: Asen H. Koedjikov, Stefan P. Stanchev, Iva B. Blagoeva, Ivan G. Pojarlieff

Publikováno v: Collection of Czechoslovak Chemical Communications. 69:2276-2280

Three (1-arylureido)acetic acids were prepared by means of controlled alkaline hydrolysis of the respective 1-arylimidazolidin-2,4-diones. Their pKa values and that of (3-phenylureido)- acetic acid were determined potentiometrically by titration in 0

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::6665c61111104afb73b3849ab9410eb8
https://doi.org/10.1135/cccc20042276

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