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  • Inorganic Chemistry  (4,341)
  • 1975-1979  (3,763)
  • 1945-1949  (578)
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  • 11
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 108 (1975), S. 716-723 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Transition Metal Substituted VB Element System. Bis(VIA metal)methylstibines as Monofunction Ligands in Transition Metal ComplexesThe photochemical or thermal reaction of the metal corbonyls M(CO)6 (M=Cr, Mo, W), π-C5H5Mn(CO)3, and Fe2(CO)9 with the dimetalated stibines CH3Sb-[M′(CO)3π-C5H5]2 (M′=Cr, Mo, W) proceeds with elimination of CO or Fe(CO)5, yielding the neutral single antimony-bridged trinuclear complexes (CO)5M—Sb(CH3)[M′L4]2, π-C5H5(CO)2Mn—Sb(CH3)[M′L4]2, and (CO)4Fe-Sb(CH3)[M′L4]2. The new compounds are characterized by means of spectroscopy.
    Notes: Die photochemische bzw. thermische Umsetzung der Metallcarbonyle M(CO)6 (M=Cr, Mo, W), π-C5H5Mn(CO)3 und Fe2(CO)9 mit den dimetallierten Stibinen CH3Sb-[M′(CO)3π-C5H5]2 (M′=Cr, Mo, W) liefert unter Eliminierung von CO bzw. Fe(CO)5 die neutralen, einfach antimonverbrückten Dreikernkomplexe (CO)5M—Sb(CH3)[M′L4]2, π-C5H5(CO)2Mn—Sb(CH3)[M′L4])2 und (CO)4Fe—Sb(CH3)[M′L4]2, Die neuen Verbindungen werden spektroskopisch charakterisiert.
    Additional Material: 3 Tab.
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  • 12
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 108 (1975), S. 735-738 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Polyacetylenic Compounds, 232. Further Constituents of the Genus DendranthemaThe genus Dendranthema, also listed as a section of Chrysanthemum, is characterized by the occurrence of 6-ring-enol ether polyynes. The structure of three new compounds has been elucidated (10-12).
    Notes: Die auch als Sektion von Chrysanthemum geführte Gattung Dendranthema ist durch das Vorkommen von 6-Ring-enolätherpolyinen charakterisiert. Drei neue Verbindungen werden in ihrer Konstitution geklärt (10-12).
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  • 13
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 108 (1975), S. 749-753 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Ozonolyse of 3,4-cis-Diacetyl-1,2,3,4-tetramethyl-1-cyclobuteneThe ozonolysis of the title compound 3 gives an ozonide (9) with trans-acetyl groups in high yield. Only a two step transformation of the primary ozonide to the final ozonide via a well defined intermediated (5) can explain this result.
    Notes: Die Tasache, daß die Ozonolyse der Titelsubstanz 3 in CFCl3 in hoher Ausbeute ein Ozonid (9) mit trans-ständigen Acetylgruppen liefert, bewiest, daß der Übergang vom Primärozonid zum Ozonid nicht einstufig, sondern über ein definiertes Zwischenprodukt (5) verläft.
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  • 14
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 108 (1975), S. 780-789 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Investigation on Metabolites of Microorganisms, VIII. Aldgamycin F, a New Antibiotic from S. lavendulaeThe new antibiotic aldgamycin F was isolated from cultures of S. lavendulae, for which we suppose structure. 7.
    Notes: Aus Kulturen von S. lavendulae wurde das neue Antibiotikum Aldgamycin F isoliert, für das wir Struktur 7 vorschlagen.
    Additional Material: 5 Ill.
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  • 15
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 108 (1975), S. 803-812 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Stereochemistry of the Alkali Alcoholate-induced Fission of Chiral Acyclic Quaternary Phosphonium Salts to Tertiary Phosphine OxidesThe stereochemical course of the sodium ethanolate-induced fission of chiral acyclic quaternary phosphonium salts 1-5 to tertiary phosphine oxides 6-10 is (with one exception) the same as that of the cleavage of these salts by sodium hydroxide. However, in most cases the stereoselectivity is remarkably lower in the alcoholate-induced fission than in the reaction with sodium hydroxide.
    Notes: Die beobachtete Brutto-Stereochemie der Spaltung chiraler acyclischer quartärer Phosphoniumsalze 1-5 zu tertiären Phosphinoxiden 6-10 mittels Natriumäthylat ist  -  mit einer Ausnahme  -  prinzipiell die gleiche wie bei der Spaltung der betreffenden Salze mit Natrium-hydroxid. Die Stereoselektivität ist dagegen bei der Spaltung mit Alkoholat meist deutlich geringer als bei der Reaktion mit Natriumhydroxid.
    Additional Material: 3 Tab.
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  • 16
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 108 (1975), S. 820-830 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The Primary Products of the Carbohydrazide/Chlorophosphorane Reaction:. 1,3,4,2λ5-OxadiazaphospholinePhosphorus pentachloride and other at least difunctional chlorophosphoranes react with acylhydrazines and with N-acyl-N′-phenylhydrazines to give 1,3,4,2λ5-oxadiazaphospholines 3. Pentacoordination at phosphorus is unexpected stable in these rings. The compounds are characterized by n. m. r. and mass spectrometry. They are more or less thermolabile and decompose eliminating phosphine oxide or a phosphorus oxide chloride. Electron releasing substituents at the phosphorus and electron withdrawing substituents at the nitrogen atom increase the rate of decomposition. With triethylamine the compounds 3 loose hydrogen chloride and yield the dimers 4 of 1,3,4,2λ5-oxadiazaphospholes.
    Notes: Phosphorpentachlorid und andere mindestens difunktionelle Chlorphosphorane reagieren mit Acylhydrazinen sowie N-Acyl-N′-phenylhydrazinen zu den 1,3,4,2λ5-Oxadiazaphospholinen 3 mit unerwartet stabiler Pentakoordination am Phosphor. Die Verbindungen werden NMR- und massenspektrometrisch charakterisiert. Sie sind mehr oder weniger thermolabil und zerfallen unter Abspaltung von Phosphinoxid bzw. eines Phosphoroxidchlorids. Der Einfluß der P-, C- und N-ständigen Substituenten auf die Zerfallsgeschwindigkeit wird diskutiert. Triäthylamin spaltet aus 3 Chlorwasserstoff ab; es entstehen Dimere 4 der 1,3,4,2λ5-Oxadiazaphosphole.
    Additional Material: 1 Ill.
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  • 17
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 108 (1975), S. 862-874 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Four Routes for the Synthesis of (2-Pyrimidinylamino)-n-alkanoic AcidsNucleotide analogues of amino acids with variously substituted 2-pyrimidinyl side chains are available by four synthetic routes. 1) The cyclocondensation of 2-alkyl-3-aminoacroleins (4) with amino acids containing guanidino functions (5b) gives Nδ-(5-alkyl-2-pyrimidinyl)ornithine derivatives (7). 2) Cyclocondensations of 1,3-diketones of (9) with C-(guanidino)amino acids or N-(amidino)amino acids (5a-d) yield (4,6-dialkyl-2-pyrimidinylamino)-n-alkanoic acids (10). 3) (4-Alkyl-6-oxo-1,6-dihydro-2-pyrimidinylamino)-n-alkanoic acids (13) are obtained by way of cyclocondensation of ethyl acetoacetate (12) with 5a-c. 4) The nucleophilic substitution of 2-ethylthio-6-oxo-1,6-dihydropyrimidines (14, 17) by mono- and diamino acids (15) yields (5-alkyl-6-oxo-1,6-dihydro-2-pyrimidinylamino)- and (4-alkyl-6-oxo-1,6-dihydro-2-pyrimidinylamino)-n-alkanoic acids (16, 18).
    Notes: Nucleotid-analoge Aminosäuren mit verschieden substituierten 2-Pyrimidinyl-Seitenketten sind auf vier Wegen zugänglich: Die Cyclokondensation von 2-Alkyl-3-aminoacroleinen (4) mit Aminosäuren mit Guanidinofunktion (5b) führt zu Nδ-(5-Alkyl-2-pyrimidinyl)ornithin-Derivaten (7). Cyclokondensationen von 1,3-Diketonen (9) mit C-(Guanidino)aminosäuren bzw. N-(Amidino)aminosäuren (5a-d) liefern (4,6-Dialkyl-2-pyrimidinyiamino)-n-alkansäuren (10). Durch Cyclokondensationen von Acetessigester (12) mit 5a-c sind (4-Alkyl-6-oxo-1,6-dihydro-2-pyrimidinylamino)-n-alkansäuren (13) darstellbar. Aus 2-Äthylthio-6-oxo-1,6-dihydropyrimidinen (14, 17) lassen sich durch nucleophile Substitution mit Mono- und Diaminosäuren (15) (5-Alkyl-6-oxo-1,6-dihydro-2-pyrimidinylamino)- sowie (4-Alkyl-6-oxo-1,6-dihydro-2-pyrimidinylamino)-n-alkansäuren (16, 18) erhalten.
    Additional Material: 1 Ill.
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  • 18
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 108 (1975), S. 897-913 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Photoelectron Spectra and Molecular Properties, XLV. Sulfuric Acid Derivatives : Alkyl, /Vinyl, and Aryl Sulfones, S,S-Dialkylsulfoimides and Sulfuryl HalidesThe photoelectron (PE) spectra of the following sulfuric acid derivatives are discussed comparatively using qualitative MO models supported by modified CNDO calculations. The substituent effects  -  including the isoelectronic exchange S=O → S=NH and structural modifications  -  can be summarized in correlation diagrams and rationalized as perturbations of the ++ group.
    Notes: Die Photoelektronen(PE)-Spektren der folgenden Schwefelsäure-Derivate werden mit qualitativen MO-Modellen, gestützt auf modifizierte CNDO-Rechnungen, vergleichend diskutiert. Die Substituenten-Effekte - den isoelektronischen Austausch S=O → S=NH und Strukturänderungen eingeschlossen  -  lassen sich in Korrelationsdiagrammen zusammenfassen und als Störungen der -Gruppe betrachten.
    Additional Material: 11 Ill.
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  • 19
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 108 (1975), S. 967-972 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Coupled Electrode Reaction, II. Benzonitrile as a Reaction Medium for Anodically Generated Carbenium IonsBy electrolysis of pivalic acid and isobutyric acid in benzonitrile/isopropyl alcohol in undivided cells N alkylated benzylamines and N,N′-diisopropyl-1,2- diphenylethylenediamine are isolated in a total yield up to 60 percent of the condensed reaction products. The reaction path is explained by anodically generated carbenium ions which react with bezonitrile forming nitrilium ions 3. These are reduced at the cathode (6, 8) or are hydrodimerized (7). The details and the formation of by-products are discussed.
    Notes: Bei der Elektrolyse von Pivalinsäure und Isobuttersäure in Benzonitril/Isopropylalkohol in ungeteilten Zellen werden in einer Gesamtausbeute bis zu 60% der kondensierten Reaktions-produkte N-alkylierte Benzylamine und N,N′-Diisopropyl-1,2-dipnhenyläthylendiamin isoliert. Der Reaktionsverlauf wird über anodisch erzeugte Carbeniumionen erklärt, die mit Benzonitril zu Nitriliumionen 3reagieren. Diese werden an der Kathode reduziert (6, 8) oder hydrodimerisiert (7). Die Einzelheiten und die Bildung von Nebenprodukten werden besprochen.
    Additional Material: 1 Ill.
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  • 20
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 108 (1975) 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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