Library

feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • 1990-1994  (3)
  • 1975-1979  (15)
  • 1970-1974  (11)
  • 1945-1949  (1)
  • 1890-1899  (5)
  • 1880-1889  (2)
  • Inorganic Chemistry  (36)
  • Cell & Developmental Biology
Material
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 668-670 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 2
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Heterocyclic Dicarboxylic Acid Esters, II. Reaction of 2,3-Bis(methoxycarbonyl)-4,5-dihydrofurans with Hydrazine and 1,2,3,6-Tetrahydropyridazine.  -  Synthesis of 3-Hydroxy-4-(2-hydroxyalkyl)-5-pyrazolcarboxylic Acid DerivativesIn contrast to the 5,6-dihydro-4H-pyran and furan dicarboxylic acid esters 1 and 4, 2,3-bis-(methoxycarbonyl)-4,5-dihydrofurans 10a-c upon treatment with hydrazine do not yield the dihydrazides but undergo ring cleavage to the 3-hydroxy-4-(2-hydroxyalkyl)-5-pyrazolecarboxylic acid hydrazides 11a-c. Under mild conditions the intermediate ester 12a can be isolated. 12a as well as 11a, c can be hydrolyzed to the carboxylic acids 14a, b. Acyllactone rearrangement of the α-alkoxalyllactones 9a, d with hydrazine also yields the esters 12a, b. I.r. and n.m.r. data are discussed.
    Notes: Bei der Behandlung der 2,3-Bis(methoxycarbonyl)-4,5-dihydrofurane 10a-c mit überschüssigem Hydrazinhydrat entstehen, im Gegensatz zum Verhalten der analogen 5,6-Dihydro-4H-pyran- und Furandicarbonsäureester 1 und 4, nicht die entsprechenden Dihydrazide, sondern es tritt Ringöffnung zu den 3-Hydroxy-4-(2-hydroxyalky)-5-pyrazolcarbonsäure-hydraziden 11a-c ein. Unter schonenden Bedingungen läßt sich der 5-Pyrazolcarbonsäureester 12a isolieren. Sowohl 12a als auch 11a, c lassen sich zu den Carbonsäuren 14a, b verseifen. Die Ester 12a, b entstehen ebenfalls in einer Acyllacton-Umlagerung der α-Alkoxalyl-lactone 9a, d mit Hydrazin. Die IR- und NMR-Daten der dargestellten Verbindungen werden diskutiert.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 107 (1974), S. 721-724 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 4
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Heterocyclic Dicarboxylic Acid Esters, III. Reaction of Dimethyl 4,5-Dihydro-2,3-furandicarboxylates with 1,2-Diamines.  -  Synthesis of 3-(5-Alkyl-2-2oxotetrahydro-3-furanylidene)-2-quinoxalinones, -2-pyrazinones, and -1,4-diazepine-2-onesTreatment of the dihydrofurandicarboxylic acid esters 4a-c with 1.2-diamines does not result in normal ester aminolysis but in ring cleavage followed by lactonization. According to the diamine used the quinoxalinones 14, 15a-c, the pyrazinones 11-c, and the diazepinones 16a, c are obtained. The independent synthesis of the compounds 11a, 14a, 15a by condensation of the different diamines with α-ethoxalyl-γ-butyrolactone as well as the tabulated i. r. and n. m. r. data confirm the proposed structures.
    Notes: Dihydrofurandicarbonsäureester vom Typ 4a-c reagieren mit 1,2-Diaminen nicht im Sinne einer normalen zweifachen Ester-Aminolyse, sondern unter Ringöffnung und anschließender Lactonisierung. Entsprechend dem eingesetzten Diamin erhält man die Chinoxalinone 14.15a-c, die Pyrazinone 11a-c sowie die Diazepinone 16a, c. Die unabhängigen Synthesen der jeweiligen Grundkörper 11a, 14a, 15a durch Kondensation der verschiedenen Diamine mit α-Äthoxalyl-γ-butyrolacton, wie auch die aufgeführten IR- und NMR-Daten bestätigen die angenommenen Strukturen.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 111 (1978), S. 811-813 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A New Synthesis of 4-Deoxy-D-glucoseA modified and improved method for the synthesis of 4-deoxy-D-glucose (4) is described. The key product is methyl 2,3,6-tri-O-acetyl-4-benzoylthio-4-deoxy-α-D-galactopyranoside (3) which readily undergoes reductive desulfurization with Raney nickel. Subsequent deacetylation and hydrolysis yield 4-deoxy-D-glucose (4).
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 105 (1972), S. 969-974 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Sugar-Siloxanes, II Synthesis of some Silicium-containing Sugar DerivativesSome sugar-silicium compounds have been synthesized by addition of methyldiethoxysilane to unsaturated monosaccharide derivatives. Among others the hitherto unknown compounds 6.7-Dideoxy-1.2;3.4-di-O-isopropylidene-α-D-galacto-hept-6-enopyranose (2) with a straight carbon chain and 3-O-acetyl-3-C-ethynyl-1.2;5.6-di-O-isopropylidene-α-D-allofuranose (8b) as well as ethynediyl-3-C.3′-C-bis(3-O-acetyl-1.2;5.6-di-O-isopropylidene-α-D-allofuranose) (9b) with branched carbon chains were used as starting materials. No addition, probably due to steric hindrance, was observed with 9b.
    Notes: Eine Reihe von Zucker-Siliciumverbindungen wurde durch Addition von Methyldiäthoxysilan an ungesättigte Monosaccharidderivate dargestellt. Als Ausgangsprodukte dienten unter anderen die bisher unbekannten Verbindungen 6.7-Didesoxy-1.2;3.4-di-O-isopropyliden-α-D-galakto-hept-6-enopyranose (2) mit unverzweigtem sowie 3-O-Acetyl-3-C-äthinyl-1.2;5.6-di-O-isopropyliden-α-D-allofuranose (8b) und Äthindiyl-3-C-.3′-C-bis-[3-O-acetyl-1.2;5.6-di-O-isopropyliden-α-D-allofuranose] (9b) mit verzweigtem Kohlenstoffgerüst. An die Verbindung 9b ließ sich, offenbar aus sterischen Gründen, kein Silan addieren.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 7
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 106 (1973), S. 929-934 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Heterocyclic Dicarboxylic Acid Esters, I. Synthesis and Reactivity of 2-Methyl-3,4-dihydro-ZH-pyrano[2,3-d]pyridazines6-Methyl-2,3-bis(methoxycarbonyl)-5,6-dihydro-4H-pyrane (2a) reacts with hydrazine to give the dihydrazid 3 which can be converted to 2-niethyl-3,4,5,6,7,8-hexahydro-2H-pyrano [2,3-d]-pyridazine-5,8-dione (4) under elimination of hydrazine. Treatment of 4 with POCl3/pyridine yields the 5,8-dichloropyranopyridazine 5. The reactivity of this compound to nucleophilic agents is studied and discussed. I. r. and n. m. r. data are given.
    Notes: 6-Methyl-2,3-bis(methoxycarbonyl)-5,6-dihydro-4H-pyran (2a) setzt sich mit Hydrazinhydrat zum Dihydrazid 3 um, welches unter Hydrazinabspaltung in das 2-Methyl-3,4,5,6,7,8-hexahydro-2H-pyrano[2,3-d]pyridazin-5,8-dion (4) übergeht. Durch Behandlung von 4 mit POCl3/Pyridin erhält man das 5,8-Dichlorpyranopyridazin 5, dessen Reaktivität gegenüber nucleophilen Agentien untersucht und diskutiert wird. Die IR- und NMR-Daten der erhaltenen Verbindungen werden aufgeführt.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 8
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 108 (1975), S. 2254-2260 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Polysaccharide Analogues, I. Synthese of 7-Amino-2,6-anhydro-7-desoxy-D-glycero-L-glycero-D-gulo-heptonic AcidSyntheses of 7-amino-2,6-anhydro-7-deoxy-D- glycero-L-manno-heptonic acid (12a) and 7-Amino-2,6-anhydro-7-deoxy-D- glycero-D-gulo-heptonic acid (12b) are described. The amino acids 12a and b may be used as monomers in the synthesis of polysaccharide analogues linked together by amide groups. Starting materials are the nitriles 1a und b which are transformed into the esters 3a and b. Selective tosylation of the primary hydroxyl groups via the trimethylsilyl ethers 4a and b followed by azide exchange yields the 7-azido derivatives 11a and b. The amino acids 12a and b are obtained by catalytic hydrogenation of 11a and b.
    Notes: Die Synthese von 7-Amino-2,6-anhydro-7-desoxy-D-glycero-L-manno-heptonsäure (12a) und 7-Amino-2,6-anhydro-7-desoxy-D-glycero-D-gulo-heptonsäure (12b) wird beschrieben. Die Aminosäuren 12a und b sind potentielle Monomereinheiten für die Darstellung von Polysaccharid-analoga mit Amidstruktur. Ausgangsprodukte sind die Nitrile 1a und b, die in die Ester 3a und b übergeführt werden. In den pertrimethylsilylierten Derivaten 4a und b können die primären Hydroxylgruppen spezifisch freigesetzt werden. Die Umsetzung von 5a und b mit p-Toluolsulfochlorid und Austausch der p-Toluolsulfonylgruppe gegen Azid liefert die Derivate 11a und b. Die Aminosäuren 12a und b werden durch katalytische Hydrierung von 11a und b dargestellt.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 9
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 110 (1977), S. 2665-2668 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On the Organoiodine(III) Dinitrates C6F5I(NO3)2 and C6H5I(NO3)2Preparation, properties, and thermal decomposition of the phenyliodine(III) dinitrates C6F5I(NO3)2 and C6H5I(NO3)2 are described and discussed.
    Notes: Darstellung, Eigenschaften und thermische Zersetzung der Phenyliod(III)-dinitrate C6F5I(NO3)2 und C6H5I(NO3)2 werden beschrieben und diskutiert.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 10
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 106 (1973), S. 3533-3539 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Heterocyclic β-Enamino Esters, X. The Reactivity of Ethyl 2-Amino-3-quinolinecarboxylate against Isocyanates, Isothiocyanates, and Lactim EthersEthyl 2-amino-3-quinolinecarboxylate (6) cyclizes in the presence of catalytic amounts of alcoholic potassium hydroxide with the isocyanates 7a-d to yield the 2,4-dioxopyrimido-[4,5-b]quinolines 8a-d. Under similar conditions p-toluenesulfonyl isocyanate affords only the p-tosylurea 10, which does not undergo further ring closure in contrast to the phenylurea 4. Treatment of 6 with isothiocyanates (7e, f) leads to 2-thioxopyrimido[4,5-b]quinolines (8e, f). 6 reacts with diethyl malonate to give the benzo[b][1,8]naphthyridine 5. - Treatment of 6 with ∊-caprolactim methyl ether yields the azepino[1′,2′:1,2]pyrimido[4,5-b]quinoline 12 and condensation with 2-methoxy-1,4,5,6-tetrahydropyrimidine gives the pyrimido[l′,2′:1,2]-pyrimido[4,5-b]quinoline 11. - I. r. and n. m. r. data are discussed.
    Notes: 2-Amino-3-chinolincarbonsäure-äthylester (6) cyclisiert in Gegenwart katalytischer Mengen alkoholischer Kaliumhydroxid-Lösung mit den Isocyanaten 7a-d zu 2,4-Dioxopyrimido-[4,5-b]chinolinen (8a-d). Mit p-Toluolsulfonylisocyanat wird lediglich der N-Tosylharnstoff 10 isoliert, der im Gegensatz zum Phenylharnstoff 4 nicht zum Pyrimido[4,5-b]chinolin cyclisiert werden kann. Mit den Isothiocyanaten 7e, f bilden sich analog die 2-Thioxopyrimido-[4,5-b]chinoline 8e, f. Aus 6 und Malonester erhält man das Benzo[b][1,8]naphthyridin 5.-6 reagiert mit ∊-Caprolactim-methyläther zu dem Azepino[l′,2′:1,2]pyrimido[4,5-b]chinolin 12 und mit 2-Methoxy-1,4,5,6-tetrahydropyrimidin zum Pyrimido[l′,2′:1,2]pyrimido[4,5-b]-chinolin 11. - IR- und NMR-Daten werden diskutiert.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...