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'Manganese' in keywords Facet   Publication Year 1991  [X]
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1991[X]
1Author    CorneliusG. Kreiter, Klaus LehrRequires cookie*
 Title    Photochemische Reaktionen von Übergangsmetall-Organyl-Komplexen mit Olefinen, VI [1] Reaktionen von Tricarbonyl-T]5-2,4-cyclohexadienyl-mangan mit konjugierten Dienen Photochem ical Reactions of Transition Metal Organyl Complexes with Olefins, VI [1] Reactions o f Tricarbonyl (^5-2,4-cyclohexadienyl)manganese with Conjugated Dienes  
 Abstract    Tricarbonyl-?/5-2,4-cyclohexadien-l-yl-manganese (1) was reacted photochemically at 253 K with simple conjugated dienes. Four different types of products were obtained, depending upon the dienes. With 1,3-butadiene (A) dicarbonyl-743-l-(3-buten-l,2-diyl)-2,4-cyclohexa-diene-manganese (2 A) is isolated. 2-Methyl-1,3-butadiene (B) yields the methyl-substituted diastereomeric dicarbonyls 2B, 2B', the [4+5]-cycloadduct tricarbonyl-//3:2-3-methyl-bicyclo-[4.3. l]-3,8-decadien-7-yl-manganese (3B) and tetracarbonyl-?/3-4-methylene-bicyclo[4.3. l]-8-decen-3-yl-manganese (4B) with an exocyclically coordinated tetracarbonylm anganese frag­ ment. W ith 2,3-dimethyl-1,3-butadiene (C) only the [4+5]-cycloadduct 3C and the tetracar-bonyl 4C are obtained. No CC-bond formation is observed with ^,^-2,4-hexadiene (D) and 1,3-cyclohexadiene (E). Carbonyl-75-2,4-cyclohexadien-1 -yl-74-£,> £'-2,4-hexadiene-manganese (5D), and carbonyl-74-l,3-cyclohexadiene-^5-2,4-cyclohexadien-l-yl-manganese (5E) are the only products. The complexes were separated and purified by HPL chrom atography. Their constitutions were determined by IR and N M R spectroscopy. 
  Reference    Z. Naturforsch. 46b, 1377—1383 (1991); eingegangen am 4. April 1991 
  Published    1991 
  Keywords    Diene Controlled C -C Bond Form ation, Manganese, Photochemical Reactions 
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 TEI-XML for    default:Reihe_B/46/ZNB-1991-46b-1377.pdf 
 Identifier    ZNB-1991-46b-1377 
 Volume    46 
2Author    Jan-K Arel Buijink, M. Athias, Noltemeyer Und, FrankT. EdelmannRequires cookie*
 Title    Metall-N,N  
 Abstract    -bis(trimethylsilyl)benzamidinate: Synthese und Kristallstruktur von Bis[N,N-bis(trimethylsilyl)benzamidinato)chroni(II), [P hC (N SiM e3)2l2Cr Metal-N,N'-bis(trimethylsilyl)benzamidinates: Synthesis and Crystal Structure of Bis[N,N'-bis(trimethylsilyl)benzamidinato]chromium(II), [PhC(NSiM e3)2]2Cr The preparation o f N,N'-bis(trimethylsilyl)benzamidinates o f chromium, manganese, zinc and bismuth is described. The chromium(II) derivative [PhC(NSiM e3)2]2Cr (2) has been char­ acterized by an X-ray structure determination. Treatment o f CpTiCl3 with one equivalent o f N a[PhC (N SiM e3),] • 0.5 Et^O yields the mixed Cp/benzamidinate complex [PhC(NSiM e3)2]CpTiCl2 (9). 
  Reference    Z. Naturforsch. 46b, 1328—1332 (1991); eingegangen am 26. April 1991 
  Published    1991 
  Keywords    N, N'-Bis(trim ethylsilyl)benzam idinates, Chromium, Manganese, Zinc, Bismuth 
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 TEI-XML for    default:Reihe_B/46/ZNB-1991-46b-1328.pdf 
 Identifier    ZNB-1991-46b-1328 
 Volume    46 
3Author    R. E. Wilkinson, R. R. DuncanRequires cookie*
 Title    Oxabetrinil Reversal of Metolachlor and Acid Soil Stress  
 Abstract    M etolachlor and excess M n:+ (acid soil stress) induce alterations in gibberellin precursor biosynthesis that can explain the morphological responses to these physiological stresses. O xa­ betrinil protects sorghum [Sorghum bicolor (L.) Moench] from the influence o f metolachlor and excess M n2+. Sorghum cultivar variations in response to excess M n2+ are explicable as dif­ ferential rates o f tvjf-kaurene biosynthesis between acid soil sensitive and tolerant cultivars. Concentrations o f M n2+ present in vegetative leaves and reproductive stem tissues were not different. Therefore, cultivar differences in e«/-kaurene biosynthesis explain the acid soil toler­ ance differences rather than differential M n2+ absorption, translocation, and/or compartmen-tation. M etolachlor and safener responses are found in cellular compartments and tissues that do not match a decreased herbicide concentration through absorption, transport, or degrada­ tion as a sole mode o f action for safeners. 
  Reference    Z. Naturforsch. 46c, 950 (1991); received March 26 1991 
  Published    1991 
  Keywords    Oxabetrinil, M etolachlor, Acid Soil Stress, Manganese, Isoprenoid Synthesis 
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 TEI-XML for    default:Reihe_C/46/ZNC-1991-46c-0950.pdf 
 Identifier    ZNC-1991-46c-0950 
 Volume    46 
4Author    Koshi SaitoRequires cookie*
 Title    Acceleration of Enzyme-Dependent Carthamin Formation by Manganese with Diversed Valence States  
 Abstract    Effect of manganese with three different valence states on carthamin formation was studied by using freshly collected flowers from dyer's saffron (C. tinctorius) capitula. A t 1 -10 hm con­ centration, these cations accelerated markedly the carthamin formation induced by endoge­ nous enzyme(s) in the detached floral tissues. The acceleration was obviously dependent on the valence state o f the test metals, more pronounced by M n (V II) or M n (III) than by M n (II) at a series o f given ionic strengths. O n a 1 |aM level, M n (V II) and M n (III) accelerated the pigment accumulation by faster o f 9 and 8, resp. than M n (II) during 5 min incubation at 30 °C. M n (V II) and M n (III) acted on both fresh and boiled florets, while M n (II) exerted preferential­ ly its activity on intact materials. Possible im plication of manganese ions on the enzyme-cata-lyzed carthamin formation are discussed. 
  Reference    Z. Naturforsch. 46c, 1011—1016 (1991); received M ay 28/July 25 1991 
  Published    1991 
  Keywords    Carthamus tinctorius, Cartham in Form ation, Manganese, Diversed Valence State 
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 TEI-XML for    default:Reihe_C/46/ZNC-1991-46c-1011.pdf 
 Identifier    ZNC-1991-46c-1011 
 Volume    46