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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    International journal of peptide research and therapeutics 7 (2000), S. 35-39 
    ISSN: 1573-3904
    Keywords: nonradioactive labeling ; peptide nucleic acids ; PNA ; PNA-peptide chimera ; tag-peptide
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The preparation of peptide nucleic acids (PNA)carrying a c-myc tag-peptide sequence isdescribed. These PNA-peptide chimeras have higheraffinity to complementary DNA than unmodifiedoligonucleotides. Moreover, they can be used asnonradioactive probes with sensitivity similar toother nonradioactive methods.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    International journal of peptide research and therapeutics 7 (2000), S. 35-39 
    ISSN: 1573-3904
    Keywords: nonradioactive labeling ; peptide nucleic acids ; PNA ; PNA-peptide chimera ; tag-peptide
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The preparation of peptide nucleic acids (PNA) carrying a c-myc tag-peptide sequence is described. These PNA-peptide chimeras have higher affinity to complementary DNA than unmodified oligonucleotides. Moreover, they can be used as nonradioactive probes with sensitivity similar to other nonradioactive methods.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 107 (1974), S. 611-615 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Hydrolysis Kinetics of Nucleoside Protective Groups Using 1H-N.M.R. SpectroscopyThe chemical shift of the proton 6-H of pyrimidine nucleoside bases in unprotected nucleosides is different from that in 3′ or 5′ protected nucleosides. By integrating both peaks repeatedly, as a function of time, concentration, and pH value, accurate kinetic data could, for the first time, be obtained.-Improved and, in some cases, new procedures for preparation of tritylated pyrimidine nucleosides are described.
    Notes: Die Lage des Basenprotons 6-H im 1H-NMR-Spektrum von Pyrimidin-Nucleosiden ist beim ungeschützten Nucleosid verschieden von derjenigen eines in 3′- oder 5′-Stellung geschützten Nucleosids. Durch Integration beider Peaks in Abhängigkeit von Zeit, Konzentration und pH-wert konnte erstmals eine quantitative Hydrolysekinetik durchgeführt werden.-Verbesserte und z. T. neue Vorschriften zur Darstellung von tritylierten Pyrimidin-Nucleosiden werden beschrieben.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 111 (1978), S. 3732-3739 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Hydrolysis Kinetics of Protective Groups on Derivatives of 2′-Deoxycytidine-5′-monophosphateThe hydrolysis kinetics of aliphatic base protecting groups on derivatives of 2′-deoxycytidine-5′-monophosphate are measured at various pH values by means of UV spectroscopy. Branched and bulky protective groups exhibit enhanced stability. Unexpectedly, the propionyl group is released faster than acetyl.
    Notes: Die Abspaltungsgeschwindigkeit aliphatischer Basenschutzgruppen bei Derivaten des 2′-Desoxycytidin-5′-monophosphats wird bei verschiedenen pH-Werten UV-spektroskopisch gemessen. Verzweigte, raumerfüllende Schutzgruppen zeigen erhöhte Stabilität. Propionyl wird überraschenderweise schneller entfernt als Acetyl.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 79 (1996), S. 137-150 
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Supports consisting of a thin layer (2-10%) of polystyrene (PS) grafted onto a poly(tetrafluoroethylene) (PTFE) core are an interesting alternative to controlled pore glass (CPG) carriers in oligonucleotide synthesis. The beads are mechanically stable, do not show significant swelling, and allow effective removal of substrates by short washing steps with organic solvents. PTFE-PS as an organic polymer has generally more hydrophobic properties than inorganic polymer supports and, therefore, is well compatible with organic solvents such as anhydrous MeCN. We found PTFE with a content of 2-3% PS graft to be a very good support for the synthesis of oligonucleotides of extended length. In comparison, PTFE with 5-10% grafted PS is especially useful for large-scale syntheses. Functionalization procedures minimized in the extent of side reactions are described as well as examples for the use of the supports in syntheses of oligonucleotides both on large scale and of extended chain length.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthese von Desoxyoligonucleotid-Fragmenten zur Anwendung in der Genverknüpfung unter Einsatz verbesserter präparativer und analytischer MethodenZur Untersuchung der Expression rekombinanter DNS haben wir Oligonucleotide als Genverknüpfungsfragmente dargestellt, die spezifische Spaltstellen sowohl in die DNA wie in das zugehörige Protein einführen. Ihr Aufbau ist so, daß die Spaltung eines Fusionsproteins entweder durch Bromcyan oder durch Kollagenase erfolgen kann. Die Synthese wurde nach dem Triesterschema durchgeführt, wobei schnellere und einfachere Wege zu funktionalisierten Dinucleotid-Baueinheiten entwickelt wurden. Die Felddesorptions-Massenspektrometrie diente als Routine-methode für den Strukturbeweis und die Reinheitskontrolle dieser Baueinheiten.
    Notes: For studies on the expression of recombinant DNA, linker fragments have been prepared which serve to introduce specific points of cleavage on the DNA as well as the protein level. Such linkers were designed for cyanogen bromide as well as for collagenase cleavage of fused proteins. The preparation was done according to the triester synthesis scheme using improved and simpler routes to functionalized dinucleotide building blocks. Field desorption mass spectrometry was used as a routine tool for the identification and control of the purity of these units.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: The cooligocondensations of 5′-O-[p-anisyldiphenylmethyl]thymidine with thymidylic acid, derivatives of deoxycytidylic acid and deoxyguanylic acid were studied. The cooligomers MMTrdT(pdN)n (N = nucleoside) were first removed from homooligomers and unreacted nucleotide by passing the reaction mixture through a column of trityl cellulose, then the separation depending on the chain length was achieved on DEAE-cellulose. In the example studied best - the cooligocondensation with N-isobutyryldeoxyguanosine-5′ phosphate - the nucleoside component was completely inserted into the cooligomers; the sequences of chain length 2, 3, 4, and 5 were obtained in 77, 18, 3 and 2% yield. The mean chain length of the product can be altered e.g. by variation of blocking groups and the ratio of starting compounds.
    Notes: Die Cooligokondensation von 5′-O-[p-Anisyldiphenylmethyl]thymidin mit Thymidylsäure und Derivaten der Desoxycytidylsäure und Desoxyguanylsäure wurde untersucht. Die Cooligomeren MMTrdT(pdN)n (N = Nucleosid) wurden von den Homooligomeren und nicht umgesetztem Nucleotid durch Chromatographie auf einer Tritylcellulose-Säule abgesondert und anschließend auf einer Diäthylaminoäthylcellulose-Säule nach Kettenlänge getrennt. Im bestuntersuchten Beispiel, der Cooligokondensation mit N-Isobutyryl-desoxyguanosin-5′-phosphat, wurde die Nucleosidkomponente vollständig in Cooligomere eingebaut: die Ketten der Länge 2, 3, 4 und 5 wurden in 77-, 18-, 3- und 2proz. Ausbeute erhalten. Die erzielbare mittlere Kettenlänge kann u. a. durch Variation der Schutzgruppen und des Komponentenverhältnisses beeinflußt werden.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Segmented block copolymer models of defined structure with molecular weights up to ca. 4000 were synthesized by specific condensation of monofunctional derivatives of oligo condensation products of 4,4′-isopropylidenediphenol (Bisphenol A) with terephthalic acid and oligomethylenes of uniform chain length. The oligo(arylester) blocks were prepared by stepwise addition of oxyterephthaloyloxy-1,4-phenyleneisopropylidene-1,4-phenylene units using a suitable protection and activation scheme. Similarly, oligo(arylester)s containing isophthaloyl and phthaloyl units were obtained. Telechelic oligomethylene segments were prepared analogously by combining functional derivatives of decane. All compounds were characterized by chemical, spectroscopic, and chromatographic methods.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 169 (1973), S. 83-93 
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: A method for the conversion of nitroaromatic functions of polymers into primary aromatic amino groups is described in which phenylhydrazine is used as the reducing agent. The reaction was tested for polystyrenes of various degrees of nitration as well as for copolymers of styrene with divinylbenzene, methyl acrylate and 4-vinylpyridine. The reaction, carried out in phenylhydrazine or in the presence of other solvents, leads to a quantitative reduction at higher temperature without side reactions such as crosslinking of soluble polymers.
    Notes: Es wird ein Verfahren zur Überführung aromatischer Nitrogruppen von Polymeren des Styrols in primäre aromatische Aminogruppen beschrieben, bei dem Phenylhydrazin als Reduktionsmittel angewandt wird. Polystyrole von verschiedenem Nitrierungsgrad sowie Copolymere von Styrol mit Divinylbenzol, Methylacrylat und 4-Vinylpyridin wurden untersucht. Die Reaktion verläuft in Lösung von Phenylhydrazin allein oder in Mischungen geeigneter Lösungsmittel bei höherer Temperatur quantitativ und ohne Vernetzung löslicher Polymerer.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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