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  • 1985-1989  (10)
  • 1
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Acta Polymerica 36 (1985), S. 657-661 
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: For further elucidation of the structure and mechanism of formation, samples of cellulose-sulfate semiesters prepared in different ways have been investigated by 13C-NMR-spectroscopy in aqueous (D2O) solution. With all samples obtained by dissolution of cellulose in the N2O4/DMF-system and simultaneous acylation with various reagents (SO2, NOSO4H, SO3 · DMF), a preferential substitution in the C-6-position was observed.
    Notes: Zur weiteren Klärung ihrer Struktur und Bildungsweise wurden unterschidlich hergestellte Cellulosesulfate mittels 13C-NMR-Spektroskopie in wäßriger Lösung (D2O) untersucht. Bei allen unter Auflösung der Cellulose im System N2O4/DMF mit unterschiedlichen Acrylierungsmitteln (SO2, NOSO4H, SO3-DMF) hergestellten Proben wurde eine bevorzugte Substitution in C-6-Stellung beobachtet.
    Additional Material: 6 Ill.
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  • 3
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The reaction of bis(hydroxymethyl)phenylphosphane withtert-butyldichlorophosphane leads to the formation ofcis-2-tert-butyl-5-phenyl-1,3,2,5-dioxadiphosphorinane (1). Thecis configuration was definitively proven by the X-ray diffraction study of the 2, 5-dithioxo derivative (2), which was obtained from (1) by a stereoselective reaction. The diselenoxo compound (3) was also prepared. These three new compounds were subjected to a complete NMR study (1H,13C,31P, and77Se).
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: NMR-Studies of 1,2-Bis(alkylphosphino)benzenes and their Anions7Li, 13C, and 31P magnetic resonance spectroscopy, including studies of spin-lattice relaxation times, have been used to investigate the structure of 1,2-bis-(alkylphosphino)benzenes and their dilithiated species in THF and Et2O solutions. A phosphorus inversion barrier of 100-110 kJ/mol has been determined for the diastereomeric bisphosphines. The chemical shifts of the diphosphides demonstrate the delocalization of the negative charge of the anions in the aromatic ring. 7Li-31P-nuclear spin couplings and T1 measurements for 13C nuclei indicate that all lithiated species are dimers with intermolecular P-Li-P-bridges.
    Notes: 7Li-, 13C- und 31P-NMR, einschließlich Spin-Gitter-Relaxationszeitmessungen, wurden zur Strukturaufklärung von 1,2-Bis(alkylphosphino)benzenen und ihren dilithiierten Spezies in THF und Et2O-Lösungen angewendet. An den diastereomeren Bisphosphinen läßt sich eine Phosphorinversionsbarriere von 100-110 kJ/mol bestimmen. Die chemischen Verschiebungen der Diphosphide demonstrieren die Delokalisierung der negativen Ladung des Anions in den aromatischen Ring.7Li-31P-Kernspinkopplungen und T1-Messungen der 13C-Kerne zeigen, daß alle lithiierten Spezies unter Ausbildung intermolekularer P-Li-P-Brücken dimer vorliegen.
    Additional Material: 1 Ill.
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  • 5
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: N.M.R. Investigations of Fluorodiazadiphosphetidines and Fluoro-λ5-monophosphazenesThe 19F and 31P n.m.r. data of 37 fluorodiazadiphosphetidines [RR′PF—NC6H4X]2, and 62 fluoro-λ5-monophosphazenes, RR′PF=NC6H4X, are submitted. In the case of tetrafluorodiazadiphosphetidines, [RPF2—NC6H4X]2, an intramolecular exchange of the fluorine atoms at phosphorus has to be concluded from the n.m.r. data. The influence of the substituents R and X on the n.m.r. parameters is discussed using simple models of molecular structure.
    Notes: Es werden die 19F- und 31P-NMR-Daten von 37 Fluorodiazadiphosphetidinen, [RR′PF—NC6H4X]2, und 62 Fluoro-λ5-monophosphazenen, RR′PF=NC6H4X, mitgeteilt. Aus ihnen muß für die Tetrafluorodiazadiphosphetidine, [RPF2—NC6H4X]2, auf einen intramolekularen Positionswechsel der Fluoratome am Phosphor geschlossen werden. Der Einfluß der Substituenten R und X auf die NMR-Parameter wird anhand einfacher Modelle der Molekülstruktur diskutiert.
    Additional Material: 1 Ill.
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  • 6
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis and Spectroscopic Studies of Di-t-butyltin(IV) dicarboxylatesFive Di-t-butyltin(IV) dicarboxylates t-Bu2Sn(O2CR)2 (R = CH3, C(CH3)3, C6H5, C6H4NH2-2, C5H4N-2) have been synthesized by reaction of Di-t-butyltinoxide (t-Bu2SnO)3 with corresponding ligands and studied by 1H-, 13C-, 119Sn n.m.r. and infrared spectroscopy.The compounds are monomeric in CD2Cl2- or CDCl3-solution and have pentacoordinated tin atoms with exception of the picolinate. The coordination takes place through the carboxylic oxygen atoms. In the Di-t-butyltin(IV)di-2-picolinate the tin atom is hexacoordinated by intramolecular tin-nitrogen-interaction.
    Notes: Durch Reaktion von Di-t-Butylzinnoxid (t-Bu2SnO)3 mit dem entsprechenden Liganden wurden fünf Di-t-Butylzinn(IV)-dicarboxylate t-Bu2Sn(O2CR)2 (R = CH3, C(CH3)3, C6H5, C6H4NH2-2, C5H4N-2) hergestellt und 1H-, 13C-, 119Sn-NMR- und IR-spektroskopisch untersucht.Die Substanzen sind in CD2Cl2- bzw. CDCl3-Lösung monomer und besitzen mit Ausnahme des Picolinats pentakoordiniertes Zinn, wobei die Koordination über den Carbonylsauerstoff erfolgt. Im Di-t-Butylzinn(IV)-di-2-picolinat ist das Zinnatom dagegen durch intramolekulare Zinn-Stickstoff-Wechselwirkung hexakoordiniert.
    Additional Material: 1 Ill.
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  • 7
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Cis- and trans-1-Phosphabicyclo[4.4.0]decaneA mixture of cis-(5a) and trans-1-phosphabicyclo [4.4.0] decane 5b has been prepared by free-radical cyclization of (CH2 = CH—CH2—CH2)2CH—PH2 10. The isomers could be separated in a pure state. Stereostructures have been assigned by 13C n.m.r. at 153 - 302 K. Equilibration of 5a and 5b by u.v. irradiation gave ⊲G°35 ≍ 0 kJ ° mol-1 · Activation parameters for ring inversion of “cis” stereoisomer 5a and its “cis” P-sulfid 17a are found to be ΔG° = 41.9 kJ · mol-1 and 39.7 kJ · mol-1, respectively. Treatment of 5a and 5b with H2O2, sulfur, selenium, HSO3F, CH3I, CS2, and Ni(CO)4, respectively, yield the corresponding derivatives. 1H, 13C, 31P, 77Se n.m.r. and i.r. data are reported.
    Notes: Durch radikalische Cyclisierung von (CH2=CH—CH2—CH2)2CH—PH2 10 wird eine Mischung von cis- (5a) und trans-1-Phosphabicyclo[4.4.0]decan (5b) erhalten. Nach Trennung in die reinen Stereoisomeren konnten die Strukturen durch 13C-NMR-Spektren bei 153 - 302 K zugeordnet werden. Gleichgewichtseinstellungen 5a ⇌ 5b durch UV-Bestrahlung ergaben bei 35°C einen ⊲G°-Wert nahe Null. Die Aktivierungsparameter für die Ringinversion von 5a und seinem Sulfid 17a betragen ⊲G = 41,9 kJ · mol-1 bzw. 39,7 kJ · mol-1. Umsetzungen von 5a und 5b mit H2O2, Schwefel, Selen, HSO3F, CH3I, CS2 und Ni(CO)4 führten zu den entsprechenden Derivaten. Werte der 1H-, 13C-, 31P- und 77Se-NMR-Spektren sowie IR-Daten der LNi(CO)3 (L = 5a, 5b) werden mitgeteilt.
    Additional Material: 4 Ill.
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  • 8
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: BF3. OEt2-catalyzed reaction of cyclic thioureas (1) with 2-benzylidenecycloalkanones (2) afforded tricyclic 1,3-thiazines (3, 4). The progress of the reactions was found to depend on the ring size of both 1 and 2.
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  • 9
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: About the Reaction of 5,6-Dihydro-1,4-oxathiin-4,4-dioxides with Nucleophilic CompoundsBy reactions of 5,6-dihydro-1,4-oxathiin-4,4-dioxides (1, 5, 8) with thioles, amines and CH-acid compounds 2-substituted ethansulfonylcarbonyl compounds are formed. The structures of the reaction products are determined by elemental analysis, i.r. and 1H-n.m.r.-spectroscopy.5,6-Dihydro-1,4-oxathiin-4,4-dioxide sind gut zugänglich durch die Oxidation von 5,6-Dihydro-1,4-oxathiinen mit Wasserstoffperoxid. Besonders zur Darstellung der 5,6-Dihydro-2-methyl-3-carboxamido-1,4-oxathiin-4,4-dioxide, von denen einige im Pflanzenschutz wegen ihrer systemischen fungiziden Wirkung Bedeutung erlangten, wurden verschiedene Methoden beschrieben [1, 2]. In ähnlicher Weise lassen sich auch die entsprechenden Ester und Säuren synthetisieren.
    Additional Material: 1 Tab.
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  • 10
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: N.M.R.-Investigation of the Intramolecular Hydrogen-Bonds in 2-Hydroxy-nitronate-anions
    Additional Material: 4 Tab.
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