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  • Chemistry  (33)
  • Inorganic Chemistry  (12)
  • Carbacyclin  (1)
  • Life and Medical Sciences
  • 1980-1984  (34)
  • 1950-1954
  • 1940-1944
  • 1982  (23)
  • 1981  (11)
Collection
Keywords
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  • 1980-1984  (34)
  • 1950-1954
  • 1940-1944
Year
  • 1
    Electronic Resource
    Electronic Resource
    Herstellung von 1, 3-Diketonen und von Nitro-diketonen durch (1:1)-Acylierungen von Lithiumenolaten mit Acylchloriden (1981)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 64 (1981), S. 716-735 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Preparation of 1,3-Diketones and of Nitro-diketones by (1:1)-Acylation of Lithium Enolates with Acyl ChloridesSlow addition of precooled solutions of lithium enolates in THF (Fig. 1) to solutions of equimolar amounts of acyl chlorides in the same solvent at temperatures between - 80 and - 100° furnishes 1, 3-diketones in acceptable to good yields (Tables 1-3). Even 3-nitropropionyl and 4-nitrobutyryl chloride can be employed for the (1:1)-acylation of enolates to give the synthetically useful 5- and 6-nitro-1, 3-diketones 13 and 25, respectively. The scope and the limitations of this method of preparing 1, 3-diketones are given and are compared with alternative methods.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19810640313
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  • 2
    Electronic Resource
    Electronic Resource
    Antitumor-aktive cis-Platin(II)-Komplexe mit α-Aminosäureestern und Peptidestern. Struktur von cis-Dichlorobis(glycylglycin-ethylester)platin(II) (1982)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 115 (1982), S. 2256-2270 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Antitumor Active cis-Platinum(II) Complexes with α-Amino Acid Esters and Peptide Esters. X-Ray Structure of cis-Dichlorobis(glycylglycine ethyl ester)platinum(II)A series of cis-platinum(II) complexes X2PtL2 (1-4) (X = halide, 2X = oxalate, malonate; L = α-amino acid ester, peptide ester) has been obtained from Pt42- and L. The dipeptide ester complexes are also accessible via peptide synthesis at the complex from Cl2Pt(NH2CHRCO2H)2 and α-amino acid esters using carbodiimide as coupling agent and the platinum atom as amino protecting group. The complexes Cl2PtL2 with α-amino acid ester ligands have also been prepared from the bis(chelate) compounds cis-Pt(NH2CHRCO2)2 and alcohol in the presence of HCl. The complexes have been characterized by their spectroscopic data, cis-Cl2Pt(GlyGlyOEt)2 (2a) by an X-ray analysis.
    Notes: Eine Reihe von cis-Platin(II)-Komplexen X2PtL2(1-4) (X = Halogenid, 2X = Oxalat, Malonat; L = α-Aminosäureester, Peptidester) wird aus PtX42- und L erhalten. Entsprechende Komplexe mit Dipeptidester-Liganden sind auch durch Peptidsynthese am Komplex aus Cl2Pt-(NH2CHRCO2H)2 und α-Aminosäureestern mit Carbodiimid als Kupplungskomponente und Platin als Aminoschutzgruppe zugänglich. Die Verbindungen Cl2PtL2 mit α-Aminosäureester-Liganden lassen sich auch aus den Bis(chelat)-Komplexen cis-Pt(NH2CHRCO2)2 und Alkohol in Gegenwart von HCl gewinnen. Die cis-Struktur der Verbindungen wurde spektroskopisch, die von Cl2Pt(GlyGlyOEt)2 (2a) durch Röntgenstrukturanalyse nachgewiesen.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19821150621
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  • 3
    Electronic Resource
    Electronic Resource
    Improved Nitroaldol Reactions and Reductive Routes to Vicinal AminoalcoholsDedicated to Prof. Vladimir Prelog on the occasion of his 75th birthday (1981)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 64 (1981), S. 2264-2271 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Regioselective and flexible procedures are described for the preparation of a variety of protected vicinal nitroalcohols 1, 3 and 5 (see Scheme 5), as is an efficient method for their reduction to the corresponding vicinal aminoalcohols 2, 4 and 6.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19810640732
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  • 4
    Electronic Resource
    Electronic Resource
    Diastereoselective Synthesis of Nitroaldol DerivativesPart of the results described here was mentioned previously in a review article [1] and in a communication [2]. (1982)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 65 (1982), S. 1101-1133 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Three methods are described by which diastereomerically enriched nitroaldols and their O-silylated derivatives can be prepared. threo-Nitroaldols prevail up to 10:1 over the erythro-isomers if doubly deprotonated nitroaldols 28 are quenched with acetic acid (THF/HMPT or DMPU, - 100°) (see Scheme 5 and Table 2). O-Trimethyl- or O-(t-butyl)dimethylsilylated (TBDMSi) erythro-nitroaldols can be obtained by protonation of the corresponding lithium nitronates (35, 39) in THF at low temperature (see Schemes 6 and 7). The erythro-O-TBDMSi-nitroaldol derivatives are also formed in the fluoride catalyzed addition of TBDMSi-nitronates (40-45) to aldehydes (see Schemes 8 and 9), In the latter reaction no 1,2-asymmetric induction is observed if a-branched silylnitronates or aldehydes are employed (see 48/49 and 50/51) - The stereochemical course of the reactions leading to erythro-O-TBDMSi-nitroaldols follows topological rules of broad applicability (see Scheme 10); possible mechnisms are discussed. - The configuration of diasteromerically 13C-NMR. Spectroscopy. - Some examples of the preparation of diastereimerically enriched 1,2-aminolcohols by reduction of the correspondence nitro compounds without loss of configurational purity are described (see Schemes 11 and 12).
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19820650402
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  • 5
    Electronic Resource
    Electronic Resource
    7-Thiatetracyclo[4.1.0.02,4.03,5]heptan (Benzvalensulfid)  -  Synthese und Reaktionen (1982)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 115 (1982), S. 3213-3223 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: 7-Thiatetracyclo[4.1.0.02,4.03,5]heptane (Benzvalene Sulfide)  -  Synthesis and ReactionsThe reaction of benzvalene (1) with N-(chlorothio)succinimide gives a mixture of the 1:1-adducts 5 and 6, the treatment of which with lithium aluminium hydride transforms 5 into 7-thiatetracyclo[4.1.0.02,4.03,5]heptane (4). Among the electrophiles studied only acids attack the bicyclo[1.1.0]butane portion of 4 and produce 3-thia-trans-tricyclo[4.1.0.02,4]heptanes (9) functionalized in exo-5-position. Peracids transfer an oxygen atom to the sulfur atom of 4 to give the episulfoxide 7. Bromine and chlorine transform 4, probably via the sulfenyl halide intermediates 10, into the bis(trans-3-halotricyclo[3.1.0.02,6]hex-4-yl) disulfides 11 and 12. Mixtures of the disulfides 15 and 16 and the sulfides 19 and 20 are obtained from 4 and thiophenol under the conditions of a radical reaction. Most likely the attack of a phenylthiyl radical at the sulfur atom of 4 initiates the complex reaction sequence.
    Notes: Die Umsetzung von Benzvalen (1) mit N-(Chlorthio)succinimid erbringt ein Gemisch der 1:1-Addukte 5 und 6, bei dessen Behandlung mit Lithiumaluminiumhydrid 5 in 7-Thiatetracyclo[4.1.0.02,4.03,5]heptan (4) übergeht. Als einzige der untersuchten Elektrophile greifen Säuren das Bicyclo[1.1.0]butan-System von 4 an und bringen so exo-5-funktionalisierte 3-Thia-trans-tricyclo[4.1.0.02,4]heptane (9) hervor. Persäuren übertragen auf das S-Atom von 4 ein Sauerstoff-atom unter Bildung des Episulfoxids 7. Brom und Chlor wandeln 4 wohl über die Sulfenylhalogenid-Zwischenstufen 10 in die Bis(trans-3-halogentricyclo[3.1.0.02,6]hex-4-yl)disulfide 11 und 12 um. Unter den Bedingungen einer Radikalreaktion entstehen aus 4 und Thiophenol Gemische der Disulfide 15 und 16 und der Sulfide 19 und 20. Wahrscheinlich löst die Addition eines Phenylthiylradikals an das S-Atom von 4 das komplexe Geschehen aus.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19821151002
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  • 6
    Electronic Resource
    Electronic Resource
    Chirale Dicarbonyl(η5-cyclopentadienyl)-Komplexe von Molybdän und Wolfram mit α-Aminosäure-Anionen (1982)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 115 (1982), S. 846-859 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Chiral Dicarbonyl(η5-cyclopentadienyl) Complexes of Molybdenum and Tungsten with Anions of α-Amino AcidsA series of chiral complexes (η5-C5H5)M(CO)2(L-L′) (M = Mo, W; L-L′ = Gly-O, Sar-O, Me2Gly-O, L-Ala-O, 2-Me-L-Ala-O, L-Val-O, L-Ser-O, L-Thr-O, L-His-O, L-Phe-O, Bzl-L-Phe-O, L-Pro-O, S-Me-L-Cys-O, L-Lys-O, L-Glu-O, L-Cys-O, L-Pen-O) (1a-t, 2a, b, 3, 4) has been prepared and spectroscopically characterized. The diastereomers can be distinguished by their 1H and 13C NMR spectra. They are configurationally stable in solution. The sarcosinato complex 1b can be resolved into the diastereomeric pairs of enantiomers. In alkaline medium a rapid equilibrium of the diastereomers (1:1) is obtained due to isomerization at the coordinated N-atom. The structure of the DL-serinato complex 1i has been determined by X-ray analysis. The unit cell contains two pairs of enantiomers (RMoRC and SMoSC).
    Notes: Eine Reihe von chiralen Komplexen (η5-C5H5)M(CO)2)(L-L′) (M = Mo, W; L-L′ = Gly-O, Sar-O, Me2Gly-O, L-Ala-O, 2-Me-L-Ala-O, L-Val-O, L-Ser-O, L-Thr-O, L-His-O, L-Phe-O, Bzi-L-Phe-O, L-Pro-O, S-Me-L-Cys-O, L-Lys-O, L-Glu-O, L-Cys-O, L-Pen-O) (1a-t, 2a, b, 3, 4) wurde dargestellt und spektroskopisch charakterisiert. Die Diastereomeren lassen sich durch ihre 1H- und 13C-NMR-Spektren unterscheiden. Sie sind in Lösung konfigurationsstabil. Der Sarkosinato-Komplex 1b läßt sich in die diastereomeren Enantiomerenpaare trennen. In alkalischem Medium stellt sich infolge Isomerisierung am koordinierten N-Atom das Diastereomerengleichgewicht 1:1 ein. Die Struktur des DL-Serinato-Komplexes 1i wurde röntgenographisch bestimmt. Die Elementarzelle enthält zwei Enantiomerenpaare (RMoRC und SMoSC).
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19821150303
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  • 7
    Electronic Resource
    Electronic Resource
    Ein einfacher Weg zu Dithiocarbimidato-Platin(II)-Komplexen (1982)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 115 (1982), S. 1665-1668 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A Simple Route to Dithiocarbimidato Platinum(II) ComplexesDithiocarbimidato complexes 3 are formed by reaction of cis-(Ph3P)2PtCl2 with primary amines in the presence of CS2. BF3 can be added to the lone pair of the N-atom in 3a. The IR and NMR data are reported.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19821150442
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  • 8
    Electronic Resource
    Electronic Resource
    Reaktionen von Carbonylmetallhydriden mit Methylthiiran und Struktur von Bis[(η-cyclopentadienyl)-μ-sulfido-sulfidomolybdän] (1982)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 115 (1982), S. 1682-1693 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Reactions of Carbonyl Metal Hydrides with Methylthiirane and Structure of Bis[(η-cyclopentadienyl)-μ-sulfido-sulfidomolybdenum]Reaction of the carbonyl metal hydrides M(η-C5H5)(H)(CO)3 (M = Mo, W), Mn(H)(CO)5, and Fe(H2)(CO)4 with methylthiirane under mild conditions leads to insertion of sulfur into the metal hydrogen bond with formation of the hydrogen sulfido complexes M(η-C5H5)(SH)(CO)3 (M = Mo, W) (1a, b), [Mn(SH)(CO)4]2 (2), and Fe3S2(CO)9 (4), respectively. The molybdenum and tungsten compounds also form the dimeric complexes [M(η-C5H5)S2]2 (M = Mo, W) (6a, b) as well as the dithiolate bridged complex (η-C5H5)Mo[SCH(Me)CH2S]2Mo(η-C5H5) (5). The X-ray structure of anti-6a has been determined.
    Notes: Die Carbonylmetallhydride M(η-C5H5)(H)(CO)3 (M = Mo, W), Mn(H)(CO)5 und Fe(H2)(CO)4 werden mit Methylthiiran unter milden Bedingungen umgesetzt. Dabei entstehen durch Insertion des Schwefelatoms in die Metall-Wasserstoff-Bindung die Hydrogensulfido-Komplexe M(η-C5H5)(SH)(CO)3 (M = Mo, W) (1a, b), [Mn(SH)(CO)4]2 (2) bzw. Fe3S2(CO)9 (4). Die Molybdän- und Wolframverbindungen bilden spontan oder bei höherer Temperatur die zweikernigen Komplexe [M(η-C5H5)S2]2 (M = Mo, W) (6a, b) sowie den Dithiolat-verbrückten Komplex (η-C5H5)Mo[SCH(Me)CH2S]2Mo(η-C5H5) (5). Die Molekülstruktur von anti-6a wurde röntgenographisch bestimmt.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19821150503
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  • 9
    Electronic Resource
    Electronic Resource
    Hydrido- und Methyl-Iridium(III)-Verbindungen mit schwach koordinierten anionischen Liganden; ein Weg zu kationischen Iridium(III)-Komplexen (1982)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 115 (1982), S. 2271-2286 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Hydrido- and Methyl-Iridium(III) Complexes with Labile Anionic Ligands; a Route to Cationic Iridium(III) ComplexesHydrido- and methyl-iridium(III) complexes (PPh3)2(CO)ClRIrX (1-4) (R = H, CH3) are formed by oxidative addition of acids HX with poorly coordinating anions X- (X- = O3SCF3-, O3SC4F9-, BF4-) and (CH3)3O+BF4-, respectively, to (PPh3)2(CO)ClIr. The excellent leaving groups X- can be substituted even by weak neutral σ- and π-donors yielding cationic iridium(III) complexes [(PPh3)2(CO)ClRIrB]+X- (5-9) (B = PPh3, CH3CN, H2O, (CH3)2CO, THF, C2H4). The structure of the key tetrafluoroborato complex (PPh3P)2(CO)Cl(H)IrFBF3 (3c) has been determined by X-ray structure analysis.
    Notes: Hydrido- und Methyl-Iridium(III)-Komplexe (PPh3)2(CO)ClRIrX (1-4) (R = H, CH3) entstehen durch oxidative Addition der Säuren HX mit schwach koordinierenden Anionen X- (X- = O3SCF3-, O3SC4F9-, BF4-) bzw. von (CH3)3O+BF4- an (PPh3)2(CO)ClIr. Die ausgezeichneten Abgangsgruppen X- lassen sich auch durch schwache neutrale σ- und π-Donoren unter Bildung der kationischen Komplexe [(PPh3)2(CO)ClRIrB]+X- (5-9) substituieren (B = PPh3, CH3CN, H2O, (CH3)2CO, THF, C2H4). Die Struktur der Schlüsselverbindung (PPh3)2(CO)Cl(H)IrFBF3 (3c) mit koordiniertem Tetrafluoroborat wurde röntgenographisch bestimmt.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19821150622
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  • 10
    Electronic Resource
    Electronic Resource
    Cyclisch gekreuzt-konjugierte Bindungssysteme, 371) Das vinyloge Sesquifulvalen (1981)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 114 (1981), S. 1679-1696 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Cyclic Cross-Conjugated Bond Systems, 371) The Vinylogous SesquifulvaleneAs a model study the tricycloheptenone 8 (“masked tropone”) - obtained from quadricyclanone 7 - is used for the synthesis of the tricyclic fulvene 9, which upon Ag⊕-catalysis or upon direct irradiation is quantitatively isomerized to the highly reactive sesquifulvalene 2. Applying the same scheme to the synthesis of the vinylogous sesquifulvalene 5, the tricyclic aldehyde 16 serves as precursor for the tricyclic fulvene 17, isomeric with 5. 17 is uniformly transformed into 5 in the presence of Ag⊕. The isomeric fulvenes 25 and 26 are exclude as precursors of 5. contrary to literature reports 5 is also obtained from 8-formylheptafulvene but only in very limited yield (max. 10%). 5 can be isolated in crystalline form and shows typical fulvalene-type spectral behavior.
    Notes: In einer Modellstudie wird aus dem Tricycloheptenon 8 (“maskiertes Tropon”) - erhältlich aus Quadricyclanon 7 - das tricyclische Fulven 9 hergestellt, welches unter Ag⊕-Katalyse bzw. unter direkter Belichtung einheitlich zum hochreaktiven Sesquifulvalen 2 isomerisiert. In einem analog konzipierten Zugang zum vinylogen Sesquifulvalen 5 dient der tricyclische Aldehyd 16 als Vor stufe für das mit 5 isomere tricyclische Fulven 17. Die Ag⊕-katalysierte isomerisierung liefert einheitlich 5. Die mit 17 isomeren Fulvene 25 und 26 kommen als Vorstufen für 5 nicht in Frage. In mäßiger Ausbeute (max. 10%) ist 5 entgegen Literaturhinweisen auch aus dem Formylheptafulven 23 erhältlich. Das kristallisiert isolierbare 5 ist durch die Spektren als typisches Fulvalen ausgewiesen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19811140510
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