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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 519 (1984), S. 141-147 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Aminophosphites and Aminophosphoranes Containing the 2,2,2-Trifluoro-1-(trifluoromethyl)ethyl GroupingBy the reaction of dichloroaminophosphines R2NPCl2 (R = Me, Et, SiMe3; R2 = CH2(CH2CMe2)2) and LiOCH(CF3)2 the phosphites 1-4 and LiCl were formed. Hexafluoroacetone reacted with 1 or 2 to give the monocyclic phosphoranes 5 and 7. Compound 5 could also be obtained from the dichloroaminophosphosphorane 6 and LiOCH(CF3)2. The aminophosphite 2, elementary chlorine and Li2[OC(CF3)2C(CF3)2O] or LiOCH(CF3)2 gave 7 or the acyclic phosphorane 8, respectively. Compounds 1-4 exhibit two magnetically inequivalent CF3 groups in the 19F-N.M.R. spectra, the phosphoranes 5, 7 and 8 show no ligand permutation at room temperature.
    Notes: Aus den Dichloraminophosphinen R2NPCl2 (R = Me, Et, SiMe3; R2 = CH2(CH2CMe2)2) konnten mit Hilfe von LiOCH(CF3)2 unter LiCl-Abspaltung die entsprechenden Phosphite 1-4 dargestellt werden. 1 und 2 ergaben mit Hexafluoraceton die monocyclischen Phosphorane 5 und 7. Aus dem Dichloraminophosphoran 6 ließ sich ebenfalls mit LiOCH(CF3)2 Verbindung 5 erhalten. Das Aminophosphit 2 setzte sich mit elementarem Chlor und Li2[OC(CF3)2C(CF3)2O] bzw. LiOCH(CF3)2 zu 7 bzw. dem acyclischen Phosphoran 8 um.Die Verbindungen 1-4 zeigen in den 19F-NMR-Spektren je zwei magnetisch nicht äquivalente CF3-Gruppen, die Phosphorane 5, 7 und 8 das “Einfrieren” der Substituentenumordnungsvorgänge bei Raumtemperatur.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 112 (1979), S. 2380-2388 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On 2-tert-Butyl-l,3,2λ5-dioxaphospholanes and 2-tert-Butyl-1,2λ5-oxaphosphetanesOxidative addition of hexafluoroacetone to the phosphorus(III) compounds 1c-g furnished the 1,3,2λ5-dioxaphospholanes 2c, 2d, 2f, 2g, and the 1,2λ5-oxaphosphetane 3, respectively; 2d undergoes thermal rearrangement to the corresponding l,2λ5-oxaphosphetane 4. The phospholes 5 and 6 are formed from hexafluorobiacetyl with phosphinous acid esters. 19F NMR spectroscopy was employed to investigate dynamic effects in the compounds obtained. For the phosphorane 2 c magnetic nonequivalence of the CF3 groups of the dioxaphospholane ring system as well as of those of the (CF3)2CHO group was observed. The related compounds 7-9 were studied for comparison, and the influence of the bulky tert-butyl groups at phosphorus was investigated.
    Notes: Durch oxidative Addition von Hexafluoraceton an die Phosphor(III)-Verbindungen 1c-g werden die 1,3,2λ5-Dioxaphospholane 2c, 2d, 2f und 2g bzw. das 1,2λ5-Oxaphosphetan 3 gebildet; 2d lagert sich thermisch in das entsprechende 1,2λ5-Oxaphosphetan 4 um. Die Phosphole 5 und 6 entstehen aus Hexafluorbiacetyl und Phosphinigsäureestern. Mit Hilfe der 19 F-NMR-Spektroskopie wurden dynamische Effekte untersucht. Bei dem Phosphoran 2c tritt magnetische Nichtäquivalenz sowohl der CF3-Gruppen des Dioxaphospholan-Ringsystems als auch der des (CF3)2CHO-Restes auf. Die analogen Verbindungen 7-9 wurden zur vergleichenden Betrachtung herangezogen und der Einfluß der raumerfüllenden tert-Butylgruppe am Phosphor studiert.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 118 (1985), S. 922-930 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Monocyclic 1,3,2λ5-OxazaphosphetanesThe reactions of aminodifluorophosphanes RNHPF2 (R = H, Me, t Bu) with LiOCH(CF3)2 yield the amidophosphites 1a, c, and e. Compounds 1a and c as well as MeNHPF2 and tBuNHPF2 add hexafluoroacetone to give in good yields to the 1,3,2λ5-oxazaphosphetanes 2a-d, which are stable at room temperature. The X-ray structure analysis of 2a exhibits a distorted trigonal bipyramid.
    Notes: Durch Reaktion von Aminodifluorphosphanen RNHPF2 (R = H, Me, tBu) mit LiOCH(CF3)2 entstehen die Amidophosphite 1a, c und e, von denen 1a und 1c wie auch MeNHPF2 und tBuNHPF2 mit Hexafluoraceton in guten Ausbeuten die bei Raumtemperatur beständigen 1,3,2λ5-Oxazaphosphetane 2a-d ergeben. Die Röntgenstrukturanalyse von 2a zeigt eine verzerrte trigonale Bipyramide.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 0044-8249
    Keywords: Leiterstrukturen ; Strukturaufklärung ; Zinn ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 0268-2605
    Keywords: organotin ; N-(2-pyridylmethylene)arylamines ; IR ; NMR ; Mössbauer ; mutagenicity ; sister chromatid exchange ; cell cycle delay ; bone-marrow cells ; Chemistry ; Industrial Chemistry and Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Diorganotin(IV) dichloride complexes of the type R2SnCl2·L (R = methyl, ethyl, vinyl, t-butyl, n-butyl or phenyl; L = N-(2-pyridylmethylene)arylamine) have been synthesized and characterized on the basis of IR, NMR and 119Sn Mössbauer studies. Investigation of the complexes indicated that N-(2-pyridylmethylene)arylamines form distorted trans-octahedral complexes with R2SnCl2 similar to the well-known R2SnCl2·L. Cytogenetic toxicology testing has been performed for Et2SnCl2·L4 [L4 = N-(2-pyridylmethylene)-4-toluidine] in mouse bone-marrow cells in vivo since such testing is a regulatory requirement before new drugs are released. This tin compound induced delay in cell-cycle kinetics and sister chromatid exchanges (SCEs) significantly. The effect of Et2SnCl2·L4 was greater when endogenous glutathione (GSH) was depleted by buthionine sulphoximine (BSO). It seems that Et2SnCl2·L4 induces SCEs due to formation of adduct by binding on DNA which could interfere in DNA synthesis and cause delay in cell proliferation. Depletion of GSH could reduce the shielding effect of GSH on chromatin and allows more Et2SnCl2·L4 to bind on DNA. © 1998 John Wiley & Sons, Ltd.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 0570-0833
    Keywords: ladder structures ; structure elcuidation ; tin ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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