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  • Polymer and Materials Science  (24)
  • Inorganic Chemistry  (18)
  • 1990-1994  (42)
  • 1993  (42)
  • 1
    Electronic Resource
    Electronic Resource
    Synthesis of Isomerically Pure Organodihydrofullerenes (1993)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 126 (1993), S. 1061-1067 
    Details
    ISSN: 0009-2940
    Keywords: Buckminsterfullerenes ; Organodihydrofullerenes ; Fullerene derivatives ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Controlled two-step nucleophilic hydroalkylations, hydroar-ylations as well as hydrostannylations of fullerene-60 (1) and fullerene-70 (2) lead to defined organodihydrofullerenes C60HR and C70HR. NMR investigations show that only one isomer of each organodihydrofullerene with Cs symmetry is formed. In all cases the addition takes place at a double bond separating two six-membered rings of the fullerene core. In this way a variety of organodihydrofullerenes also carrying functional groups have been synthesized.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19931260428
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  • 2
    Electronic Resource
    Electronic Resource
    Preparation of optically active polymer layers by after-glow plasma polymerization (1993)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 211 (1993), S. 141-155 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Die after-glow Plasmapolymerisation wird als neues Verfahren zur Herstellung polymerer Schichten aus ungesättigten Monomeren vorgestellt. Als Monomeres wird ein optisch aktiver Acrylsäureester verwendet. Die Abscheidekinetik wird durch Variation von Monomerfluß, Fluß und Art des Hilfsgases (He, Ne, Ar, Kr) Abstand zwischen Plasma und Substrat, Druck und nomineller Plasmaleistung untersucht. Die erhaltenen Polymeren sind optisch aktiv und lassen sich mittels IR_Spektroskopie nicht von den in Masse polymerisierten Analoga unterscheiden. Die Polymeren sind meist vernetzt und damit unlöslich. NMR-Spektren von Löslichen Proben zeigen, daß es sich um atktische Polymere handelt. Die after-glow Plasmapolymerisation verläuft über einen radikalischen Kettenwachstumsmechanismus. Membranchichten aus den erhaltenen Polymeren sind in der Lage, Racemate zu trennen.
    Notes: After-glow plasma polymerization is described as a new method to prepare polymeric layers from unsaturated monomers. An optically active acrylic monomer is used in this investigation. The deposition rates are given as functions of plasma power, pressure, distance between plasma and deposition zone, flux and kind of auxiliary gas (He, Ne, Ar, Kr) and of monomer flux. The polymers prepared are optically active, the IR spectra comply with those of polymers synthesized in bulk. Mostly the polymers prepared by after-glow plasma polymerization are cross-linked and therefore insoluble. NMR spectra of soluble samples show that the polymers are atactic. After-glow plasma polymerization occurs by a radical chain growth mechanism. Membranes made from these polymers are able to separate racemates.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1993.052110113
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  • 3
    Electronic Resource
    Electronic Resource
    Water-soluble polyamides as potential drug carriers, VIPresented in part at the Symposium on Water-soluble Polymers, 198th Natl. Meeting, Am. Chem. Soc., Miami Beach, Fla., September 10-15, 1989. Part V cf.1. Synthesis of amine- and carboxyl-functionalized carrier polymers by high-temperature solution polymerization in polyphosphoric acid (1993)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 207 (1993), S. 123-135 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Durch Polykondensation aliphatischer Dicarbonsäuren wie Bernsteinsäure, Iminodiessigsäure und Ethylendiamintetraessigsäure (die als difunktionelles Monomeres reagierte) mit Diaminen wie Diethylentriamin, l, 2-Bis(3-aminopropylamino)ethan und den beiden löslichkeitsverbesserenden Polyethylenoxid-Derivaten α,ω-Bis(2-aminopropyl)polyethylenglykol800 (Jeffamine ED-900) und α,ω-Bis-(2-aminopropyl)- poly-ethylenglykol 1900 (Jeffamine ED-2001) wurden hydrophile Polyamide mit Aminooder Carboxygruppen in ihren Wiederholungseinheiten hergestellt, die zur Ankopplung physiologisch aktiver Substanzen geeignet sind. Die Reaktionen wurden in Polyphosphorsäure im optimalen Temperaturbereich von 150- 165°C durchgefuhrt. Die Produktpolymeren wurden durch Dialyse wäßriger Lösungen fraktioniert und durch Gefriertrocknung isoliert. Die Ausbeuten, die von 1% bis nahe 40% reichten, zeigen für das fluchtige Diethylentriamin unter diesen Bedingungen eine geringe Tendenz zur Polykondensation und eine mittelmanige Reaktionsneigung fur die thermolabilen Jeffamine-Reaktanden, während für das Bis(aminopropylamino)ethan eine zufriedenstellende Polykondensationsbereitschaft gefunden wurde. Die mikroanalytisch und spektroskopisch charakterisierten Polyamide verfügen über eine  -  für biomedizinische Anwendungen wichtige  -  ausreichende Wasserlöslichkeit. Die inhärenten Viskositäten in diesem Medium liegen im Bereich von 5 - 15 ml g-1. Die Nutzung dieser Polymeren zur Verankerung von Medikamenten wird Gegenstand weiterer Veröffentlichungen sein.
    Notes: Hydrophilic polyamides containing amino or carboxyl groups in the repeat units suitable for drug binding are synthesized by polycondensation of aliphatic dicarboxylic acids, including succinic acid, iminodiacetic acid, and ethylenediaminetetraacetic acid (reacting as a difunctional monomer in these polymerizations), with diamines, such as diethylenetriamine, 1,2-bis(3-aminopropylamino)ethane, and the two hydrosolubilizing poly(ethylene oxide) derivatives, α,ω-bis(2-aminopropyl)poly(ethylene glycol) 800 (Jeffamine ED-900) and α,ω-bis(2-aminopropyl)poly(ethylene glycol) 1900 (Jeffamine ED-2001). The reactions are conducted in polyphosphoric acid medium at the optimal temperature range of 150-165°C. The product polymers, fractionated by aqueous-phase dialysis in 12000-14000 molecular-mass cut-off membrane tubing, are isolated by freeze-drying. Yield data, ranging from 1% to nearly 40% for the material so fractionated, indicate low propensity for polycondensation under these conditions for the volatile diethylenetriamine monomer, and only moderately better performance for the thermally labile Jeffamines, yet satisfactory polymerization behaviour for the bis(aminopropylamino)ethane. The microanalytically and spectroscopically characterized polyamides fulfil the biomedically important requirement of solubility in water; inherent viscosities in this medium are in the approximate range of 5-15 ml · g-1. The drug-anchoring capabilities of these polymers will be the subject of forthcoming publications.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1993.052070112
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  • 4
    Electronic Resource
    Electronic Resource
    Nucleophile Singulett-Carbene in der [4 + 1]1-Cycloaddition mit 1,2,4,5-Tetrazinen: Eine neue Isopyrazol-Synthese (1993)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 126 (1993), S. 733-738 
    Details
    ISSN: 0009-2940
    Keywords: Singlet carbenes ; [4 + 1] Cycloadditions ; Isopyrazoles ; Diels-Alder reactions ; [4 + 2] Cycloreversion ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Nucleophilic Singlet Carbenes in the [4 + 1] Cycloaddition with 1,2,4,5-Tetrazines: a New Synthesis of IsopyrazolesA series of 3,6-disubstituted 1,2,4,5-tetrazines 6, including C6H5, SCH3, SO2CH3, N(CH3)2, CF3, CO2CH3 groups, has been submitted to [4 + 1] cycloaddition with the nucleophilic singlet carbenes 4, 15, and 20, which are generated from the precursors 1, 11 and 19, resp. In all cases isopyrazoles (4H1-pyrazoles) 9, 10, 18, and 21 are isolated in good yields. They are formed in a two-step reaction sequence with the [4 + 1] cycloadducts of type 8 as intermediates which eliminate nitrogen by subsequent [4 + 2] cycloreversion. The acceptor-substituted isopyrazole 9e is characterized as an electron-deficient diene by some Diels-Alder reactions with inverse electron demand leading to the expected azo-bridged cycloadducts 23, 25, 27, 29, and 31 without acid catalysis or application of higher pressure. With cyclooctyne (32), the [4 + 2] cycloaddition is followed by a [4 + 2] cycloreversion with formation of the cyclopentacyclooctene 34.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19931260325
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  • 5
    Electronic Resource
    Electronic Resource
    Bis(pentamethylcyclopentadienyl)keton und -thioketon: Kohlenstoff-Verbindungen mit präformierter Diels-Alder-Geometrie (1993)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 126 (1993), S. 415-420 
    Details
    ISSN: 0009-2940
    Keywords: 1,3-Cyclopentadiene-5-carbonyl chloride, 1,2,3,4,5-pentamethyl- ; 1,3-Cyclopentadiene-5-carbothioyl chloride, 1,2,3,4,5-pentamethyl- ; Ketone, bis(1,2,3,4,5-pentamethyl-1,3-cyclopentadien-5-yl) ; Thioketone, bis(1,2,3,4,5-pentamethyl-1,3-cyclopentadien-5-yl) ; Diels-Alder preformation ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Bis(pentamethylcyclopentadienyl) Ketone and Thioketone: Carbon Compounds with Performed Diels-Alder Geometry1,2,3,4,5-Pentamethyl-1,3-cyclopentadien-5-carbonyl chloride (2) is formed in good yields by the reaction of pentamethylcyclopentadienyllithium (1) with phosgene. The corresponding carbothioyl chloride 3 is synthesized by treatment of 1 with thiophosgene. Both acyl chlorides are stable against air and moisture and difficult to attack in SN2-type reactions. Treatment of 2 and 3 with trimethyl(pentamethylcyclopentadienyl)stannane in the presence of boron trifluoride  -  ether leads to bis(1,2,3,4,5-pentamethyl-1,3-cyclopentadien-5-yl) ketone (5) and thioketone (6), respectively. Even at room temperature, 5 and 6 tend to intramolecular [4 + 2] cycloaddition reactions. X-ray crystal structure investigations of 2, 5, and 6 show the steric demand of the pentamethylcyclopentadienyl ligand and explain the untypical chemical behavior of 2 and the easy [2 + 4] cycloaddition reactions of 5 and 6.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19931260219
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  • 6
    Electronic Resource
    Electronic Resource
    Complexation with Diol Host Compounds, 12. Synthesis and Solid-State Inclusion Properties of Bis(diarylhydroxymethyl)1-Substituted 1,1′-Binaphthyls. Crystal Structures of a Host and Its Pyridine Clathrate (1993)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 126 (1993), S. 1141-1148 
    Details
    ISSN: 0009-2940
    Keywords: Diol host compounds ; Clathrates ; Crystal structures of host and clathrate ; 1,1′-Binaphthyl derivatives ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A series of new clathrate host molecules 1 - 8 containing two bis(diarylhydroxymethyl) groups attached to different positions (2,2′ or 8,8′) of a 1,1′-binaphthyl frame have been synthesized. Their clathrate formation properties with organic guests including alcohols, amines, ketones, and other dipolar aprotic compounds or aromatic hydrocarbons are reported (74 examples of clathrates) together with the results of solvent competition experiments for the parent host compound. The inclusion formation and the clathrate stoichiometries depend on the structure of the host molecules in a systematic manner. The crystal structures of the free parent host 1 and its pyridine clathrate (1 : 3) have been determined by X-ray diffraction. The molecular structure of the host is similar in the two species involving an intramolecular hydrogen bond between the host hydroxyls. No other hydrogen bond is involved in the free host case while in the pyridine inclusion compound the second host hydroxyl forms a hydrogen bond with the nitrogen of one pyridine guest which is surrounded by two unbound pyridine species such as to form clusters of three pyridine guests enclosed in the cavities between the host molecules. Thermal analysis corresponds with the two binding states of the pyridine molecules in the clathrate.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19931260513
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  • 7
    Electronic Resource
    Electronic Resource
    Metallorganische Verbindungen der Lanthanoide, 73. Synthese und Struktur neuer Monocyclooctatetraenyl-Komplexe von Yttrium, Terbium und LutetiumHerrn Professor Ulrich Wannagat zum 70. Geburtstag gewidmet. (1993)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 126 (1993), S. 907-912 
    Details
    ISSN: 0009-2940
    Keywords: Cyclopentadienyl complexes ; Cyclooctatetraenyl complexes ; Yttrium compounds ; Terbium compounds ; Lutetium compounds ; Lanthanoides, organo-, alkoxides ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Organometallic Compounds of the Lanthanoids, 73[1]. - Synthesis and Structure of New Monocyclooctatetraenyl Complexes of Yttrium, Terbium, and Lutetium[(C8H8)Ln(μ1-Cl)(THF)]2 (Ln=Y, Lu) react with NaOR (R=Ph, C6H3Me2-2,6) to give the dinuclear cyclooctatetraenyl rare earth alkoxides [(C8H8)Ln(μ1-OR)(THF)]2 [R=Ph, Ln=Y (1a), Lu (1b); R=C6H3Me2-2,6, Ln=Y (2a), Lu (2b)]. The reactions of [(C8H8)Ln(μ1-Cl)(THF)]2 with LiOC(tBu)3, NaOSiPh3, and NaC5H3tBu2 result in the formation of (C8H8)LnOC(tBu)3(THF) [Ln=Y (3a), Lu (3b)], (C8H8)LnOSiPh3(THF) [Ln=Y (4a), Lu (4b)], and (C8H8)Tb(C5H3tBu2) (5), respectively. Treatment of (C8H8)Y(C5Me5) with acetylacetone yields (C5Me5)Y(acac)2 (6). The 1H-and 13C-NMR and mass spectra of the new compounds as well as the X-ray crystal structures of 1a and 5 are discussed.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19931260409
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  • 8
    Electronic Resource
    Electronic Resource
    Synthese und Struktur des ersten oligomeren cyclischen Dimethylsilyl-substituierten Carbodiimids (1993)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 126 (1993), S. 2569-2571 
    Details
    ISSN: 0009-2940
    Keywords: Carbodiimide, silyl ; Structure ; Precursor ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Synthesis and Structure of the First Oligomeric Cyclic Dimethylsilyl-Substituted CarbodiimideNew oligomeric cyclic silylcarbodiimides 1-3 are synthesised by the reaction of the respective dichlorosilanes with cyanamide. From the resulting reaction mixture with dichloro-dimethylsilane the tetrameric compound of the hypothetical [(CH3)2Si=N-CN] is isolated. In this molecule sixteen atoms build a nearly planar ring structure with a special steric arrangement of the groups. This oligomeric silylcarbodiimides present a new kind of precursors for the pyrolytic synthesis of ceramics in the ternary system SiCN.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19931261202
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  • 9
    Electronic Resource
    Electronic Resource
    C*Ru-Thiolkomplexe, II[1]. Adduktbildung in [Cp*RuII(π-SR)]2 und [Cp*Ru(C6F5)(μ-SC6F5)(μ-S)RuCp*]. Molekülstruktur von cis-[Cp*Ru(μ2-StBu)(CO)]2 und [Cp*Ru(C6F5)(μ-SC6F5)(μ-S)RuCp*] (1993)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 126 (1993), S. 2609-2618 
    Details
    ISSN: 0009-2940
    Keywords: Ruthenium, pentamethylcyclopentadienyl complex ; Ruthenium thiol complex ; Addition equilibria ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Cp*Ru Thiol Complexes, II[1]. - Adduct Formation in [Cp*RuII(μ-SR)]2 and Cp*Ru(C6F5)(μ-SC6F5)(μ-S)RuCp*]. Molecular Structure of cis-[Cp*Ru(μ2-StBu)(CO)]2 and [Cp*Ru(C6F5)(μ-SC6F5)(μ-S)RuCp*]Reaction of [Cp*Ru(μ-OMe)]2 (1) with thiols RSH gave the sulfur analogues to 1, [Cp*Ru(μ-SR)]2 (2), and with PhSH after carbonylation cis-[Cp*Ru(μ-SPh)(CO)]2 (11). C6F5SH as thiol reacts with 1 to form [Cp*Ru(C6F5)(μ-SC6F5)(μ-S)RuCp*] (3a) with oxidative migration of a C6F5 group from S to Ru. For elucidation of the constitutions molecular structures of 3a and cis-[Cp*Ru(μ-StBu)(CO)] (10) were determined by single crystal X-ray diffraction. Adduct formation and bridge cleavage of the doubly coordinatively unsaturated dinuclear complexes 2 and singly unsaturated complex 3 with donor and acceptor ligands is investigated and the donor/acceptor character of the Ru centers in thiol complexes 2 compared to those in 1. Substitution reactions of [{Cp*Ru(μ-OMe)}2(dppm)] (4) with PhSH and C6F5SH yield complexes [{Cp*Ru(μ-SR)}2(dppm)] (R = Ph 5, C6F5 6).
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19931261208
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  • 10
    Electronic Resource
    Electronic Resource
    Derivate des Imidazols, VI. Stabile Carben-Borane (1993)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 126 (1993), S. 2041-2045 
    Details
    ISSN: 0009-2940
    Keywords: Imidazol-2-ylidene - Borane adducts ; Calculations, ab initio ; Borane - Imidazol-2-ylidene adducts ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Imidazole Derivatives, VI[1].  -  Stable Carbene BoranesStable imidazol-2-ylidene - borane adducts 8 and 9 are obtained from 1,3,4,5-tetraalkylimidazol-2-ylidenes 7 and Me2S BH3 or Et2O BF3. An X-ray structure analysis of 8b has been performed. An ab initio calculation [MP2(fu)/6-31G**] reveals a low energy difference between two rotamers. The bond orders of the cyclic bonds imply only a minor interaction between the N - C - N and the C - C fragment.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19931260913
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