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  • 1985-1989  (4)
  • 1
    Electronic Resource
    Electronic Resource
    Activation of alkynes by the dinitrogen complex [CoH(N2)(PPh 3)3] towards catalytic oligomerization and cyclization reactions (1988)
    Springer
    Monatshefte für Chemie 119 (1988), S. 583-589 
    Details
    ISSN: 1434-4475
    Keywords: Alkynes ; Catalysis ; Dinitrogen complex ; Nitriles ; Pyrimidine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Der Komplex [CoH(N2)(PPh 3)3] katalysiert Oligomerisations- und Cyclisierungsreaktionen von Alkinen unter milden Bedingungen. Die Cyclotrimerisierung von Propinsäureethylester ergibt die drei möglichen Isomeren von Tricarbethoxybenzol; Phenylacetylen reagiert hauptsächlich zu linearen Dimeren (vor allemtrans-PhC≡CCH=CHPh) und Trimeren; lineare Dimere herrschen auch bei 3-Hexin vor, während 1-Octin (mit langer Alkylkette) vorwiegend zu 2-Octin isomerisiert wird. In allen Fällen werden ebenfalls höhere Oligomere gebildet. Außer bei Propinsäureethylester entstehen ebenfalls in geringer Menge hydrierte Dimere (z. B.trans,trans-PhCH=CHCH=CHPh aus Phenylacetylen). Eine neue Art von Cocyclisierungsreaktion mit einem Nitril (NCMe) scheint bei der Bildung (in geringer Ausbeute) von 4,6-Dimethyl-5-phenyl-pyrimidin aus Phenylacetylen vorzuliegen. Alkinole reagieren unter den Versuchsbedingungen nicht.
    Notes: Abstract The complex [CoH(N2)(PPh 3)3] catalyses oligomerization and cyclization reactions of alkynes under mild conditions. Hence, alkyne cocyclotrimerization to benzene derivatives was mainly observed for ethyl propiolate, affording the three possible isomers of tricarbethoxybenzene; phenylacetylene undergoes mainly linear dimerization totrans-PhC≡CCH=CHPh and trimerization; linear dimers are also the predominant products from 3-hexyne, but 1-octyne (with a long chain) undergoes mainly isomerization to 2-octyne; higher oligomers are also usually formed. Except for ethyl propiolate, hydrogenated dimers are detected in low yields (e.g.trans,trans-PhCH=CHCH=CHPh from phenylacetylene), whereas 3-hexene is formed in considerable yield from 3-hexyne. A novel type of cocyclization reaction with a nitrile (NCMe) appears to occur with phenylacetylene to give (although in low yield) 4,6-dimethyl-5-phenyl-pyrimidine. Alkynols are unreactive under the chosen conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00809210
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Study on the reactions of the dinitrogen complexestrans-[M(N2)2(Ph 2PCH2CH2PPh 2)2] (M=Mo or W) with ethyldiazoacetate: Formation of an Azo compound and of a phosphazene species (1986)
    Springer
    Monatshefte für Chemie 117 (1986), S. 429-435 
    Details
    ISSN: 1434-4475
    Keywords: Catalysis ; Dinitrogen complexes ; Ethyldiazoacetate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die Komplexetrans-[Mo(N2)2(dppe)2] (dppe=Ph 2PCH2CH2PPh 2) reagieren mit NN=CHCOOEt in benzolischer Lösung zuPh-N=N-CH3 als organischem Hauptprodukt. Andererseits wird bei der Bestrahlung vontrans-[W(N2)2(dppe)2] inTHF-Lösung in der Gegenwart von Ethyldiazoacetat das PhosphazenPh 2P(N2CHCOOEt)(CH2CH2)P(N2CHCOOEt)Ph 2 gebildet; in feuchter Lösung erleidet die Phosphazen-Bindung eine teilweise Hydrolyse und die Phosphonium-Spezies [Ph 2P(NHNCHCOOEt)(CH2CH2)P(NHNCHCOOEt)Ph 2]2+ scheint gebildet zu werden.
    Notes: Abstract Complextrans-[Mo(N2)2(dppe)2] (dppe=Ph 2PCH2CH2PPh 2) reacts with NN=CHCOOEt in benzene solution to afford benzene-azomethane,Ph-N=N-CH3, as the main organic product. However, the phosphazene speciesPh 2P(N2CHCOOEt)(CH2CH2)P(N2CHCOOEt)Ph 2 is formed by irradiating aTHF solution oftrans-[W(N2)2(dppe)2] in the presence of ethyldiazoacetate; in moist solution, the phosphazene bonds undergo a partial hydrolysis, and the phosphonium species [Ph 2P(NHNCHCOOEt)(CH2CH2)P(NHNCHCOOEt)Ph 2]2+ appears to be formed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00810890
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Reactions of the dinitrogen complextrans-[ReCl(N2)(dppe)2] with thiolate compounds and with carbon bisulphide (1985)
    Springer
    Transition metal chemistry 10 (1985), S. 463-466 
    Details
    ISSN: 1572-901X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The complextrans-[ReCl(N2)(dppe)2], (1) reacts with the thiolate salts Li[SC6H4Me-4], Tl[SC6H4Me-4] and [Pb(SBu-t)2] to yield [ReCl(SC6H4Me-4)(dppe)2], [Re(SC6H4Me-4) (dppe)2] and [{ReO(dppe)}2(μ-Cl)(μ-S)(μ-SBu-t)] (tentative formulation), respectively. The [ReCl(η2-CS2)(dppe)2] complex appears to be formed by reaction of (1) with CS2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00620710
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    A study of the protonation and alkylation oft-butyl isocyanide intrans-[M(CNBu-t 2(Ph2PCH2CH2PPh2)2] (M = Mo or W): Formation of carbyne-type complexes and theirtrans- tocis-isomerization (1985)
    Springer
    Transition metal chemistry 10 (1985), S. 427-431 
    Details
    ISSN: 1572-901X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Treatment of complexestrans-[M(CNBu-t)2(dppe)2][(1) M = Mo or W, dppe = Ph2PCH2CH2PPh2] with protic acid gives a mixture of the aminocarbyne complexestrans- pluscis-[M(CNHBu-t)(CNBu-t)(dppe)2]+ (2) and the hydridocompounds [MH(CNBu-t)2(dppe)2]+ (3), whereas reaction with an alkylating agent (R+) appears to give the dialkylaminocarbyne compounds [M(CNRBu-t)(CNBu-t)(dppe)2]+ (4) also as a mixture of thetrans andcis isomers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01096752
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    Paper (German National Licenses)
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