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  • 1985-1989  (14)
  • 1
    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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  • 2
    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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  • 3
    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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  • 4
    Electronic Resource
    Electronic Resource
    Phosphorus Pentoxide in Organic Synthesis, XII. Synthesis of 7H-Pyrrolo[2,3-d]pyrimidin-4-amines (1985)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1985 (1985), S. 142-148 
    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, XII.  -  Synthese von 7H-Pyrrolo[2,3-d]-pyrimidin-4-aminenEs wird ein einstufiges Verfahren zur Herstellung einiger neuer substituierter 7H-Pyrrolo[2,3-d]-pyrimidin-4-amine 2 beschrieben. Dazu werden die entsprechenden Pyrrolo[2,3-d]pyrimidin-4(3H)-one 1 in einer Mischung aus Phosphorpentoxid, N,N-Dimethylcyclohexylamin und dem geeigneten Amin-hydrochlorid erhitzt. Bei Hydrochloriden aromatischer Amine verläft die Reaktion glatt bei 200-220°C innerhalb von 1-4h, Hydrochloride aliphatischer Amine hingegen reagieren langsamer und liefern die Produkte 3 in geringer Ausbeute. Im Fall von Diethylamin-hydrochlorid wird zusammen mit dem erwarteten Produkt 3e das dimere Kondensationsprodukt 5 isoliert. Ferner werden die Ergebnisse von Pestizid-Eignungstests mitgeteilt.
    Notes: A one-step synthesis for the preparation of a new series of substituted 7H-pyrrolo[2,3-d]pyrimidin-4-amines 2 is described. The method consists in heating the corresponding pyrrolo [2,3-d]pyrimidin-4(3H)-ones 1 in a mixture of phosphorus pentoxide, N,N-dimethylcyclohexylamine, and the appropriate amine hydrochloride. With aromatic amine hydrochlorides the reaction proceeds smoothly at 200-220°C for 1-4 h, whereas with aliphatic amine hydrochlorides, the reaction takes place at slower rate affording the products 3 in lower yields. With diethylamine hydrochloride, the condensed dimeric product 5 is isolated together with the expected product 3e. The results from pesticide screenings are reported.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.198519850115
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  • 5
    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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  • 6
    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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  • 7
    Electronic Resource
    Electronic Resource
    Anomalously coupled nucleosides, I tributylammonium phosphates in chloroform for direct coupling of 2-deoxy-D-ribose with N6-substituted adenines (1986)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1986 (1986), S. 1837-1846 
    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, I. - Tributylammonium-phosphate in Chloroform zur direkten Verknüpfung von 2-Desoxy-D-ribose mit N6-substituierten AdeninenPhosphorpentoxid reagiert mit Wasser und Tributylamin in Chloroform zu einer homogenen Lösung von Tributylammonium-phosphat, Pyrophosphat und Trimetaphosphat. 3-(9-Adenyl)-2,3-didesoxy-D-threo-pentofuranosen 3 fallen kristallin an, wenn 2-Desoxy-D-ribose (2) mit N6-substituierten Adeninen 1 in dieser Lösung 7 Tage bei 40°C umgesetzt wird.
    Notes: Phosphorus pentoxide reacts with water and tributylamine in chloroform to give a homogeneous solution of tributylammonium phosphate, pyrophosphate, and trimetaphosphate. 3-(9-Adenyl)-2,3-dideoxy-D-threo-pentopyranoses 3 precipitate on treatment of 2-deoxy-D-ribose (2) with N6-substituted adenines 1 in this solution at 40°C after 7 days.
    Additional Material: 5 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.198619861103
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  • 8
    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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  • 9
    Electronic Resource
    Electronic Resource
    Nitriles in Heterocyclic Synthesis: A Novel Synthesis of 2-Amino-3-pyrrolecarbonitriles (1989)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1989 (1989), S. 1145-1146 
    Details
    ISSN: 0170-2041
    Keywords: 3-Pyrrolecarbonitriles, 2-amino- ; Malononitriles, phenylacyl ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 2-Amino-3-pyrrolecarbonitriles are prepared by the reaction of phenacylmalononitrile with primary aromatic amines using a catalytical amount of concd. HCl.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.198919890285
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  • 10
    Electronic Resource
    Electronic Resource
    Synthesis of New 2-Azaadenines and 2-Azahypoxanthines from 4-Diazo-4H-imidazoles (1986)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1986 (1986), S. 1012-1020 
    Details
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthese neuer 2-Azaadenine und 2-Azahypoxanthine aus 4-Diazo-4H-imidazolenEine Reihe neuer, möglicherweise biologisch wirksamer N6-substituierter 2-Azaadenine 5 wurde aus 5-Amino-1H-imidazol-4-carboxamid-hydrochlorid über 4-Diazo-4H-imidazol-5-carbonitril (1), das mit primären Aminen gekuppelt wurde, mit 11 - 78proz. Ausbeute hergestellt. Auch einige 1-substituierte 2-Azahypoxanthine 9 wurden aus 5-Amino-1H-imidazol-4-carbonsäure-ethylester (6) über 4-Diazo-4H-imidazol-5-carbonsäure-ethylester (7) durch Kopplung mit primären Aminen mit 17 - 66proz. Ausbeute gewonnen.
    Notes: 5-Amino-1H-imidazole-4-carboxamide hydrochloride has been converted into a series of new, potentially biologically active N6-substituted 2-azaadenines 5 via 4-diazo-4H-imidazole-5-carbonitrile (1) which was coupled with primary amines to give 5 in 11 - 78% yield. Further, some 1-substituted 2-azahypoxanthines 9 have been prepared in 17 - 66% yield from ethyl 5-amino-1H-imidazole-4-carboxylate (6) via ethyl 4-diazo-4H-imidazole-5-carboxylate (7) which was coupled with primary amines.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.198619860606
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