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  • Chromium complexes  (2)
  • Inhalation  (2)
  • Metallophosphaalkenes  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Haemopoietic stem cells in mice chronically exposed to styrene vapour (1990)
    Springer
    Archives of toxicology 64 (1990), S. 466-469 
    Details
    ISSN: 1432-0738
    Keywords: Styrene ; Mice ; Inhalation ; Haemopoietic stem cells
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Female C57BL/6× DBA/2 hybrid mice were exposed to two concentrations of styrene in inhalation chambers for 6 h/day, 5 days per week. The concentrations were 220 ppm for a period of up to 8 weeks and 440 ppm for 2 days, followed by 330 ppm for up to 8 weeks due to early deaths after 440 ppm. Parallel groups were also treated with 5% ethanol in the drinking water during the days of styrene exposure. In the peripheral blood only a lymphocytopenia was found. The numbers of pluripotent haemopoietic stem cells, CFU-S, were unaffected, as were granuloid committed stem cells, CFU-C. Early and late erythroid stem cell numbers, BFU-E and CFU-E, showed high variability. At 220 ppm about half of the animals had CFU-E numbers below 80% of controls, at 440/330 ppm about two-thirds of the animals had BFU-E and CFU-E numbers below this level. An additional effect of ethanol was not found.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01977628
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  • 2
    Electronic Resource
    Electronic Resource
    Hematological toxicity of tetrachloroethylene in mice (1992)
    Springer
    Archives of toxicology 66 (1992), S. 228-230 
    Details
    ISSN: 1432-0738
    Keywords: Tetrachloroethylene (PER) ; Mice ; Inhalation ; Haemopoietic stem cells
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Female C57/BL/6 × DBA/2 hybrid mice were exposed to two concentrations (270 and 135 ppm) of tetrachloroethylene (PER) in inhalation chambers for 6 h/day, 5 days per week, up to 11.5 weeks (270 ppm) and 7.5 weeks (135 ppm), respectively, followed by a 3-week exposure-free period. In the peripheral blood a reduction of lymphocytes/monocytes and of neutrophils was observed with an almost complete regeneration in the exposure-free period. A reticulocytosis during and also after the exposure indicated a compensatory reaction in the erythroid cell system. Bone marrow pluripotent stem cells (CFU-S) were not affected up to 7.5 weeks. Erythroid committed cells (BFU-E and CFU-E) did react, with a reduction of CFU-E numbers at 7.5 and 11.5 weeks. A slight reduction of CFU-C numbers at 7.5 weeks indicated, in accordance with the peripheral blood data, a disturbance of the granulocytic cell series as well.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01974021
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  • 3
    Electronic Resource
    Electronic Resource
    Umlagerungsreaktionen von Metallodiphosphapropenen des Typs (η5-C5Me5)(CO)2FeP(SiMe3)  -  P = C(R)(SiMe3) (R = SiMe3, Ph)Herrn Professor Heinrich Nöth zum 65. Geburtstag gewidmet. (1993)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 126 (1993), S. 1963-1968 
    Details
    ISSN: 0009-2940
    Keywords: Diphosphapropenes ; CH insertion ; Diphosphiranes ; Chromium complexes ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Rearrangements of the Metallodiphosphapropenes (η5-C5Me5)(CO)2FeP(SiMe3  -  P = C(R)(SiMe3) (R = SiMe3, Ph)Heating of a methylcyclohexane solution of (η5-C5Me5)-(CO)2FeP(SiMe3)  -  P = C(SiMe3)2 (1a) gives rise to the insertion of the P = C moiety into the CH bond of a ring methyl group with formation of the chelate complex η5-ηC5Me4CH2P-[CH(SiMe3)2]P(SiMe3)Fe(CO)2 (2) which is converted into the pentacarbonylchromium derivative [5-C5Me4CH2P[CH-(SiMe3)2]P(SiMe3)[Cr(CO)5]Fe(CO)2] (3). In contrast, a similar treatment of (5-C5Me5)(CO)2FeP(SiMe3)  -  P = C(Ph)(SiMe3) (1 b) furnishes the diphosphirane (5-C5Me5)(CO)2FeP  -  C(Ph)-SiMe3)  -  P (SiMe3) (5). By chromatography of its (CO)5Cr adduct 6, the P  -  Si bond is hydrolyzed to give the (diphosphirane)-chromium complex [(5-C5Me5)(CO)2FeP-C(Ph)(SiMe3)P(H)]-Cr(CO)5 (8). The molecular structures of 3 and 8 are determined by single-crystal X-ray analysis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19931260902
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  • 4
    Electronic Resource
    Electronic Resource
    Übergangsmetall-substituierte Diphosphene, XXVII[1] Synthese und Struktur des Diphosphirans (η5-C5Me5)(CO)2Fe-H[Cr(CO)5] (1992)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 125 (1992), S. 1553-1557 
    Details
    ISSN: 0009-2940
    Keywords: Phosphido complexes ; Phosphaalkenes ; Diphosphiranes ; Chromium complexes ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Transition-Metal-Substituted Diphosphenes, XXVII[1]. - Synthesis and Structure of the Diphosphirane (η5-C5Me5)(CO)2Fe-PH[Cr(CO)5(η5-C5Me5)(CO)2FePH2 (5), prepared from (η5-C5Me5)(CO)2Fe-P(SiMe3)2 and ethanol, reacts with one equivalent of ClP = C(SiMe3)2 to give the diphosphirane (η5-C5Me5)(CO)2FePH (8). Compound 8 is converted into the iron chromium complex [(η5-C5Me5)(CO)2Fe-H]Cr(CO)5(9). In contrast, the reaction of 5 with two equivalents of ClP=C(SiMe3)2 results in the formation of the cyclotri-phosphane [(η5-C5Me5)(CO)2Fe-[CH(SiMe3)2] (12). The molecular structure of 9 is elucidated by single-crystal X-ray analysis.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19921250707
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  • 5
    Electronic Resource
    Electronic Resource
    Metallsubstituierte Phosphaalkene und Acylphosphane. 31. Zur Reaktivität von (η5-C5Me5)(CO)2FeP = C(NMe2)2 gegenüber Zinndichlorid. Röntgenstrukturanalyse von {(η5-C5Me5)[η1-(Me2N)2C = P—P = C(NMe2)2](CO)2Fe}+{[Me2N)2C]2P}+(FeCl4)2- (1996)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 622 (1996), S. 1935-1940 
    Details
    ISSN: 0044-2313
    Keywords: Metallophosphaalkenes ; Transition Metal Complexes ; X-Ray Structure Analysis ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Transition-Metal Substituted Phosphaalkenes and Acyl Phosphanes. 31 [1] Reactivity of (η5-C5Me5)(CO)2FeP = C(NMe2)2 towards Tin Dichloride. X-Ray Structure Analysis of {(η5-C5Me5)[η1-(Me2N)2C = P—P = C(NMe2)2](CO)2Fe}+{[Me2N)2C]2P}+(FeCl4)2-Reaction of metallophosphaalkene (η5-C5Me5)(CO)2 · FeP = C(NMe2)2 (1) with anhydrous tin dichloride affords the salt-like compound {(η5-C5Me5)[η1-(Me2N)2C = P—P = C(NMe2)2] · (CO)2Fe}+{[(Me2N)2C]2P}+(FeCl4)2- 5 which is characterized by single crystal X-ray analysis and spectra (IR, 1H, 31P-NMR).
    Notes: Die Reaktion des Metallophosphaalkens (η5-C5Me5(CO)2FeP = C(NMe2) 2 (1) mit wasserfreiem Zinndichlorid liefert die salzartige Verbindung {(η5-C5Me5)[η1-(Me2N)2 · C = P—P = C(NMe2)2](CO)2Fe}+{[(Me2N)2C]2P}+(FeCl4)2-5, die durch Einkristall-Röntgenstrukturanalyse und Spektren (IR, 1H, 31P-NMR) charakterisiert wird.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19966221120
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  • 6
    Electronic Resource
    Electronic Resource
    Metallophosphaalkenes - from Exotics to Versatile Building Blocks in Preparative Chemistry (1996)
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 35 (1996), S. 271-288 
    Details
    ISSN: 0570-0833
    Keywords: metallophosphaalkenes ; phosphaalkenes ; transition metal compounds ; Metallophosphaalkenes ; Phosphaalkenes ; Transition metals ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The chemistry of low-valent organophosphorus compounds such as phosphaalkenes and phosphaalkynes has undergone rapid development in the last two decades. This development also includes the coordination chemistry of these species, which can act as versatile ligands in metal complexes. Metallophosphaalkenes are compounds in which one or more of the organic substituents on the P=C unit is replaced by a transition metal complex fragment. Metallophosphaalkenes have emerged from an existence as laboratory curiosities to become a link between main group and organometallic complex chemistry. The great richness of their chemistry not only mirrors the specific properties of the individual building block, but also shows novel and individual traits. Particular examples are cycloadditions of these electron-rich heteroalkenes with electron-deficient alkenes, alkynes, azo, and diazo compounds. These often lead to novel types of reaction and compounds. Metallophosphaalkenes are also important as intermediates in all metal-assisted cyclooligomerizations of phosphaalkynes.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/anie.199602711
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