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  • Electronic Resource  (14)
  • 1985-1989  (14)
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  • Electronic Resource  (14)
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  • 1
    Electronic Resource
    Electronic Resource
    Turbulent Stresses Downstream of Porcine and Pericardial Aortic Valves Implanted in Pigs (1989)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of cardiac surgery 4 (1989), S. 0 
    Details
    ISSN: 1540-8191
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Because late valve-related complications such as hemolysis and thromboembolic events are considered related to flow disturbances caused by the inserted valve, velocity fields downstream of aortic valve prostheses were studied in pigs. Acute hemodynamic evaluation of size 25-mm porcine and pericardial aortic valve prostheses 1 diameter downstream of the valve ring was performed using dynamic three-dimensional visualization of velocity profiles and spatial distribution of turbulence.Point blood velocity signals obtained with a 1-mm hot-film anemometer needle probe were used to compute Reynolds normal stresses (RNS) by calculation of the turbulent velocity energy of the axial velocity component in the systole.The porcine valves caused a skewed velocity and turbulence profile revealing mean spatial systolic RNS at 70 nm−2+ 35 nm−2 (+ SD). The spatial maximum RNS was 275 + 139 nm−2. Corresponding values for the pericardial valves were 20 + 11 nm−2 and 72 + 46 nm−2.The pericardial valves revealed plug-shaped velocity profiles and turbulent profiles with slightly higher RNS values at the stent posts. From a hemodynamic point of view, these acute studies indicate superiority of the pericardial valves compared to the porcine valves. The turbulent stresses found in this study are of a magnitude that may cause blood corpuscular and endothelial damage.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1540-8191.1989.tb00259.x
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  • 2
    Electronic Resource
    Electronic Resource
    Recent basic research in hydrodesulfurization catalysis (1986)
    s.l. : American Chemical Society
    Industrial and engineering chemistry 25 (1986), S. 25-36 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/i100021a004
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  • 3
    Electronic Resource
    Electronic Resource
    Long-distance magnetic exchange between chromium(III) atoms bridged by H3O2- ligands (1987)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 109 (1987), S. 5855-5856 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00253a050
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  • 4
    Electronic Resource
    Electronic Resource
    Anomalously Coupled Nucleosides, II. Reaction of 3-[N6-(4-Chlorophenyl)-2-methyl-9-adenyl]-2,3-dideoxy-D-threo-pentopyranose with Alcohols and Anilines (1987)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1987 (1987), S. 705-708 
    Details
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Ungewöhnlich verknüpfte Nucleoside, II. - Reaktion von 3-[N6-(4-Chlorphenyl)-2-methyl-9-adenyl]-2,3-didesoxy-D-threo-pentopyranose mit Alkoholen und Anilinen3-[N6-(4-Chlorphenyl)-2-methyl-9-adenyl]-2,3-didesoxy-D-threo-pentopyranose (1) wurde in die Alkyl-3-[N6-(4-chlorphenyl)-2-methyl-9-adenyl]-2,3-didesoxy-D-threo-pentopyranoside 2 und die N-Aryl-3-[N6-(4-chlorphenyl)-2-methyl-9-adenyl]-2,3-didesoxy-D-threo-pentopyranosylamine 4 umgewandelt. Die Verbindungen 2 wurden als α/β-Anomeren-Gemische isoliert, bei verlängerten Reaktionszeiten wurden jedoch reine α-Anomere 3 erhalten.
    Notes: 3-[N6-(4-Chlorphenyl)-2-methyl-9-adenyl]-2,3-dideoxy-D-threo-pentopyranose (1) has been converted into the alkyl 3-[N6-(4-chlorophenyl)-2-methyl-9-adenyl]-2,3-dideoxy-D-threo-pentopyranosides 2 and into the N-aryl-3-[N6-(4-chlorophenyl)-2-methyl-9-adenyl]-2,3-dideoxy-D-threo-pentopyranosylamines 4. The compounds 2 were isolated as mixtures of α and β anomers whereas pure α anomers 3 could be obtained after prolonged reaction times.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.198719870812
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  • 5
    Electronic Resource
    Electronic Resource
    Anomalously Coupled Nucleosides, III. Coupling of Unprotected 2-Deoxy-D-ribose at C-3 with N6-Acyladenines as a New Route to Isomers of Adenosine (1987)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1987 (1987), S. 787-791 
    Details
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Ungewöhnlich verknüpfte Nucleoside, III. - Verknüpfung von ungeschützter 2-Desoxy-D-ribose an C-3 mit N6-Acyladeninen, ein neuer Weg zu Isomeren des AdenosinsDie ungewöhnliche Verknüpfung von N6-Acyladeninen 1 mit C-3 von ungeschützter 2-Desoxy-D-ribose (2) gelingt mit P4O10/H2O/Bu3N als Kupplungsreagens in Chloroform. Von den so erhaltenen 3-(9-Adenyl)-2,3-didesoxy-D-threo-pentopyranosen 3 wurden mit Ammoniak in Methanol die Acylgruppen unter Bildung des ungewöhnlich verknüpften Isomers 5 von Adenosin abgespalten.
    Notes: Anomalous coupling at C-3 of unprotected 2-deoxy-D-ribose (2) with N6-acyladenosines 1 was performed using P4O10/H2O/Bu3N in chloroform as the coupling reagent. The 3-(9-adenyl)-2,3-dideoxy-D-threo-pentopyranoses 3 formed were deprotected with ammonia in methanol to give the anomalously coupled isomer 5 of adenosine.
    Additional Material: 5 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.198719870829
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  • 6
    Electronic Resource
    Electronic Resource
    Phosphorus Pentoxide in Organic Synthesis, XXIX. Synthesis of 4-Arylamino-5,6,7,8-Tetrahydro-1H-Pyrazolo[3,4-b]Quinolines and the Corresponding N-Mannich Bases (1986)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1986 (1986), S. 1728-1735 
    Details
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Phosphorpentoxid in der Organischen Synthese, XXIX. - Synthese von 4-Arylamino-5,6,7,8-tetrahydro-1H-pyrazolo[3,4-b]chinolinen und entsprechenden N-Mannich-Basen4-Arylamino-5,6,7,8-tetrahydro-1H-pyrazolo[3,4-b]chinoline 2 lassen sich aus 5-Amino-1H-pyrazol-4-carbonsäure-ethylester (1) und Cyclohexanon durch Erhitzen in einer Mischung aus P4O10, N,N-Dimethylcyclohexylamin und einem geeigneten Arylamin-hydrochlorid herstellen (8 - 52% Ausbeute). Umsetzung von 2 mit Formaldehyd und sekundären Aminen ergibt die Mannich-Basen 3 zu 45 - 94%. Versuche, die Verbindungen 2 in den Positionen 5,6,7 und 8 nach einer früher benutzten Methode zu dehydrieren, scheiterten.
    Notes: 4-Arylamino-5,6,7,8-tetrahydro-1H-pyrazolo[3,4-b]quinolines 2 have been synthesized from ethyl 5-amino-1H-pyrazole-4-carboxylate (1) and cyclohexanone by heating in a reagent mixture of P4O10, N,N-dimethylcyclohexylamine, and an appropriate arylamine hydrochloride (8 - 52% yield). Reaction of 2 with formaldehyde and secondary amines afforded the Mannich bases 3 in 45 - 94% yield. Attempts to prepare the 5,6,7,8-dehydrogenated analogues of 2 using a previously adopted method failed.
    Additional Material: 5 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.198619861006
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  • 7
    Electronic Resource
    Electronic Resource
    Coupling of Unprotected 2-Deoxy-D-ribose at C-3 as a New Route to 2,3-Dideoxy-3-phthalimido-D-pentoses (1987)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1987 (1987), S. 1111-1114 
    Details
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Direct condensation of 2-deoxy-D-ribose (2) with phthalimides using P4O10/H2O/Bu3N reagent in chloroform at 40°C results in a coupling at C-3 of the carbohydrate moiety to give an isomeric mixture of 2,3-dideoxy-3-phthalimido-D-pentoses 3-5. Acetylation of 3b-5b using acetic anhydride in dry pyridine gives the corresponding acetylated derivatives 6-8. After treating the mixture of 3b, 4b, and 5b with triphenylmethyl chloride in pyridine, pure threo-pyranose derivative 3b and pure tritylated erythro-furanose derivative 9 are obtained by fractional precipitation.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.198719870881
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  • 8
    Electronic Resource
    Electronic Resource
    Phosphorus Pentoxide in Organic Synthesis, XVI. A One-step Synthesis of 2-Methyl-N6-aryladenines from 5-Acetylamino-1H-imidazole-4-carboxamide Hydrochloride (1985)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1985 (1985), S. 921-928 
    Details
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Phosphorpentoxid in der Organischen Synthese, XVI1). - Eine Eintopf-Synthese von 2-Methyl-N6-aryladeninen aus 5-Acetylamino-1H-imidazol-4-carboxamid-hydrochlorid2-Methyl-6-(arylamino)purine 3 lassen sich aus 5-Amino-1H-imidazol-4-carboxamid-hydrochlorid über 5-Acetylamino-1H-imidazol-4-carboxamid-hydrochlorid (1) durch Erhitzen (180°C) mit Phosphorpentoxid, Triethylamin-hydrochlorid und einem geeignet substituierten Anilin herstellen.
    Notes: 5-Amino-1H-imidazole-4-carboxamide hydrochloride has been converted into a series of 2-methyl-6-(arylamino)purines 3 via 5-acetylamino-1H-imidazole-4-carboxamide hydrochloride (1) which was heated with phosphorus pentoxide, triethylamine hydrochloride, and an appropriate substituted aniline at 180°C.
    Additional Material: 5 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.198519850506
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  • 9
    Electronic Resource
    Electronic Resource
    Phosphorus Pentoxide in Organic Synthesis, XVIII. Phosphorus Pentoxide and Secondary Amine Mixtures in a New Synthesis of N6,N6-Dialkyl- and N6-Alkyl,N6-aryl-9H-purin-6-amines (1985)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1985 (1985), S. 1223-1227 
    Details
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Phosphorpentoxid in der Organischen Synthese, XVIII1). - Eine neue Synthese von N6,N6-Dialkyl- und N6-Alkyl,N6-aryl-9H-purin-6-aminen unter Verwendung von Phosphorpentoxid/sekundäres Amin-GemischenEs wird die Herstellung einer Reihe von N6,N6-disubstituierten 9H-Purin-6-aminen 2a-i aus 5-Acetamido-6-amino-2-methylpyrimidin-4(3H)-on (1) und sekundären Aminen oder entsprechenden Hydrochloriden in Gegenwart von Phosphorpentoxid und Triethylaminhydrochlorid beschrieben.
    Notes: A series of N6,N6-disubstituted 9H-purin-6-amines 2a-i was prepared from 5-acetamido-6-amino-2-methylpyrimidin-4(3H)-one (1) and a secondary amine or its hydrochloride in the presence of phosphorus pentoxide and triethylamine hydrochloride.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.198519850613
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  • 10
    Electronic Resource
    Electronic Resource
    Diphosphorus pentaoxide in organic synthesis, XXVII. A one-step synthesis of thiazolo[5,4-d]pyrimidin-7-amines and purine-6-thiones from 5-(acylamino)-2-methyl-4-thiazolecarboxamides (1986)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1986 (1986), S. 1255-1261 
    Details
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Diphosphorepentaoxid in der organischen Synthese, XXVII. - Eine Einschritt-Synthese von Thiazolo[5,4-d]pyrimidin-7-aminen und Purin-6-thionen aus 5-(Acylamino)-2-methyl-4-thiazolcarboxamiden5-(Acylamino)-2-methyl-4-thiazolcarboxamide 1 wurden in eine Reihe von N-Arylthiazolo-[5,4-d]pyrimidin-7-aminen 2 und 9-Aryl-1,9-dihydro-6H-purin-6-thione 3 übergeführt, indem man sie mit einer Mischung aus Diphosphorpentaoxid, Triethylamin-hydrochlorid und einem geeigneten, substituierten Anilin 2 min auf 240°C und dann 1 h auf 160°C erhitzte. Das Verhältnis von 2 zu 3 ist abhängig vom eingesetzten Anilin und Thiazol.
    Notes: 5-(Acylamino)-2-methyl-4-thiazolecarboxamides 1 have been converted into a series of N-arylthiazolo[5,4-d]pyrimidin-7-amines 2 and 9-aryl-1,9-dihydro-6H-purine-6-thiones 3 by heating in a mixture of diphosphorus pentaoxide, triethylamine hydrochloride, and an appropriate substituted aniline at 240°C for 2 min and then at 160°C for 1 h. The ratio of 2 and 3 depends on the aniline and thiazole used.
    Additional Material: 7 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.198619860711
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