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  • 1
    Electronic Resource
    Electronic Resource
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 50 (1994), S. 1588-1590 
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 603 (1991), S. 41-47 
    ISSN: 0044-2313
    Keywords: Sodium triorganostannylalkylsulphonates ; ion-exchange ; triorganostannylalkyl sulphonic acids ; cyclocondensation ; triorganotin alkanesulphonates ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis and Stability of Triorganostannylalkyl Sulphonic AcidsSodium triorganostannylalkylsulphonates R3Sn(CH2)nSO3Na(1-4) are obtained by reaction of triorganostannylsodium with sodium halogenoalkylsulphonates or propane sulton in liquid ammonia. 1-4 can be converted by ion-exchange in the free sulphonic acids R3Sn(CH2)n SO3H(9-12). 9-12 are of limited stability and undergo cyclocondensation reactions with formation of the cyclic triorganotin alkanesulphonates .
    Notes: Natrium-triorganostannylalkylsulfonate R3Sn(CH2)nSO3Na (1-4) werden durch Umsetzung von Natrium-triorganostanniden mit Natrium-halogenoalkylsulfonaten oder Propansulton in flüssigem Ammoniak erhalten. Durch Ionenaustausch können 1-4 in die freien Sulfonsäuren R3Sn(CH2)nSO3H (9-12) überführt werden.9-12 sind von begrenzter Stabilität und unterliegen Cyclokondensationsreaktionen unter Bildung der cyclischen Alkylsulfonsäure-triorganostannylester .
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 619 (1993), S. 859-864 
    ISSN: 0044-2313
    Keywords: 2,2-Bis(diisopropoxyphosphonyl)propyl methyltin dibromide ; synthesis ; crystal structure ; n.m.r. data ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Molecular Structure of 2,2-Bis(diisopropoxyphosphonyl)propyl Methyltin DibromideBy methylation of Me3SnCH2CH[P(O)(OPr-i)2]2 with NaH/MeI Me3SnCH2C(Me)[P(O)(OPr-i)2]2 (1) is obtained, which is converted by bromine into the dibromide MeBr2SnCH2C(Me)[P(O)(OPr-i)2]2 (2). An X-ray crystal structure analysis shows 2 to be monomeric. The tin atom is situated in the centre of a distorted octahedron, in which the functional substituent is intramolecular coordinated as tridentate ligand in a facial mode. The two organo groups are arranged in trans-position (C—Sn—C 155.1°), whereas the oxygen and bromine atoms are orientated cis to each other. The six-membered ring of the bicyclic molecular fragment of 2 which results from the coordination of the functional organo group to the tin atom shows a boat-conformation, whereas the two five-membered rings exist in twist-conformations. Multinuclear n.m.r. and i.r. data show that 2 retains its solid state structure also in nonpolar solvents.
    Notes: Durch Methylierung von Me3SnCH2CH[P(O)(OPr-i)2]2 mittels NaH/MeI erhält man Me3SnCH2C(Me)[P(O)(OPr-i)2]2 (1), das mit Brom in das Dibromid MeBr2SnCH2C(Me)[P(O)(OPr-i)2]2 (2) überführt wird. Nach der Röntgenkristallstrukturanalyse ist 2 im Festkörper monomer. Das Zinnatom befindet sich im Zentrum eines verzerrten Oktaeders, in dem der funktionelle Substituent intramolekular als tridentater Ligand in facialer Anordnung koordiniert ist. Die beiden Organoreste sind trans-ständig angeordnet (C—Sn—C 155,1°), während sich die Sauerstoff- und Bromatome in cis-Anordnung zueinander befinden. Der Sechsring des aus der Koordination des funktionellen Organorestes am Zinnatom resultierenden bicyclischen Molekülfragmentes von 2 weist Wannenkonformation auf, während die beiden Fünfringe in Twist-Konformationen vorliegen. Multikern-NMR- und IR-Daten belegen, daß 2 seine Festkörperstruktur auch in unpolaren Lösungsmitteln beibehält.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 0044-2313
    Keywords: Hydrostannation ; ethyl 3-(triorganostannyl)-N-acetylalaninates ; ethyl 3-(phenylhalogenostannyl)-N-acetylalaninates ; X-ray, IR, NMR data ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis and Reactivity of 3-Triorganostannylsubstituted Alanine Derivatives. Crystal Structure of Ethyl 3-(diphenylchlorostannyl)-N-acetyl alaninateC-Stannylated alanine derivatives of the type R3SnCH2—CH(NHCOMe) COOEt (1-4) are synthesized by hydrostannation of ethyl N-acetyl-α, β-dehydroalaninate with triorganotin hydrides or by reaction of potassium triphenylstannide with ethyl N-acetyl-3-chloroalaninate, respectively. The halogenation of 1 yields the halostannylsubstituted compounds Ph3 - nXnSnCH2CH(NHCOMe)COOEt 5-7 (n = 1, 2; X = Cl, Br). IR, NMR data and the determination of the crystal structure of Ph2Sn(Cl)CH2—CH(NHCOMe)COOEt (5) reveal for 5-7 an intramolecular coordination of the amide-CO group at the tin atom.
    Notes: C-stannylierte Alaninderivate des Typs R3SnCH2—CH(NHCOMe) COOEt (1-4) werden durch Hydrostannierung von N-Acetyl-α, β-dehydroalaninethylester mit Triorganozinnhydriden oder durch Umsetzung von Kalium-triphenylstannid mit N-Acetyl-3-chloroalaninethylester dargestellt. Die Halogenierung von 1 liefert die halogenostannylsubstituierten Verbindungen Ph3 - nXnSnCH2CH(NHCOMe)COOEt 5-7 (n = 1, 2; X = Cl, Br). IR-, NMR-Daten und die Bestimmung der Kristallstruktur von Ph2Sn(Cl)CH2—CH(NHCOMe)COOEt (5) beweisen für 5-7 eine intramolekulare Koordination der Amid-CO-Gruppe an das Zinnatom.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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