Library

X
Language
Preferred search index
Number of Hits per Page
Default Sort Criterion
Default Sort Ordering
Size of Search History
Default Email Address
Default Export Format
Default Export Encoding
Facet list arrangement
Maximum number of values per filter
Auto Completion
Feed Format
Maximum Number of Items per Feed
Permalink If you want to be able to use settings permanently, you must save your settings and then set a Bookmark to the permalink
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Evidence for .alpha.-phosphanyl-.alpha.'-sulfinylcarbene to .alpha.-phosphoranyl-.alpha.'-sulfanylcarbene rearrangement. Synthesis of 2-oxo- and 2-thioxo-1,2-.lambda.5-azaphosphetanes (1989)
    s.l. : American Chemical Society
    The @journal of organic chemistry 54 (1989), S. 4426-4430 
    Details
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jo00279a035
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Reaction of stannyl-substituted phosphorus ylides with boron trifluoride diethyl etherate: evidence for formation of transient triphenylphosphonio-substituted stannaethenes (1991)
    s.l. : American Chemical Society
    Organometallics 10 (1991), S. 938-946 
    Details
    ISSN: 1520-6041
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/om00050a027
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Organometallic Chemistry of Main Group Elements in the Gas Phase: Formation and Reactions of Gaseous [AsI2.cntdot.arene]+ Complexes (1995)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 117 (1995), S. 2313-2320 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00113a020
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Synthesis and structure of a monomeric diarylstannylene (1991)
    s.l. : American Chemical Society
    Organometallics 10 (1991), S. 23-25 
    Details
    ISSN: 1520-6041
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/om00047a013
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Synthese und Struktur eines Imino(phosphoranylidenmethyl)phosphans: Ein neues Hetero-Allyl-Anion (1991)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 124 (1991), S. 329-331 
    Details
    ISSN: 0009-2940
    Keywords: Imino phosphines ; Allyl anions ; Silyl migration ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Synthesis and Structure of an Imino(phosphoranylidenemethyl)phosphine: A New Hetero Allyl AnionReaction of the (dichlorophosphinyl)methylphosphonium salt 1 with three equivalents of sodium bis(trimethylsilyl)amide (2) in THF at - 78°C leads to the P-(phosphoranylidenemethyl)-substituted iminophosphine 4. Compound 4 is probably formed via 3 by 1,3-silyl migration. According to an X-ray analysis, 4 can be described as a hetero allyl anion with a 3- center-4-electron bond C1-P1-N1. Oxidative addition of sulfur or selenium results in formation of the imino(thioxo)phosphorane 8 or imino(selenoxo)phosphorane 9.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19911240213
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Mixed amide thiolate complexes of zinc with low coordination number at the metal atom (1992)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 125 (1992), S. 2199-2207 
    Details
    ISSN: 0009-2940
    Keywords: Zinc complexes ; Low coordination ; Amide complexes ; Thiolate complexes ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Three different thiophenoles 2,4,6-(CF3)3C6H2SH (4), 2,4,6-(iPr)3C6H2SH (5), and 2,6-(Me3Si)2C6H3SH (6) with bulky sub-stituents in ortho position were treated with Zn[N(SiMe3)2]2 (7) in a non-coordinating solvent like CH2Cl2 or toluene to yield mixed amide thiolate zinc complexes Zn2[N(SiMe3)2]{S[2,4,6-(CF)3C6H2]}3 (8), Zn3[N(SiMe3)2]2{S[2,4,6-(iPr)3C6H2]}4 (9), and Zn2{S[2,6-(Me3Si)2C6H3]}4 (10), respectively. These compounds comprise low-coordinated zinc atoms. Initially, the reactions were performed in a 1:1 ratio of the reactants. However, in no reaction the expected {Zn[N(SiMe3)2](SR)}x (X = 1,2,3…) species were obtained but compounds which are richer in thiolate substituents (SR/NR2 〉 1) even if a large excess of amide 7 was used. Distinct from these, the reaction between 7 and 2,6-(iPr)2C6H3OH (14) in a 1:1 ratio afforded indeed dimer Zn2[N(SiMe3)2]2{O[2,6-(iPr)2C6H3]}2 (15). The molecular structures of 8, 9, 10, and 15 in the crystal are elucidated by X-ray structural analyses and compared with proposed structures in solution based on multinuclear NMR experiments.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19921251006
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Synthese von fünfgliedrigen Heterocyclen - Reaktionen funktioneller Formamidine mit Alkenen, Alkinen und Heterokumulenen (1987)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 120 (1987), S. 995-998 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: N-[1-Chloro-2,2,2-trifluoro-1-(trifluormethyl)ethyl]-N′,N′-dialkylformamidines 1a, b react with alkenes, alkynes, CO2, COS, and SO2 in the presence of base to form known and new heterocycles 9a,b, 10, 11a,b, and 12. The observed regioselectivities and the rate dependence on the solvent are remarkable different from reactions in which nitrile ylides are postulated as reactive intermediates.
    Notes: Die N-[1-Chlor-2,2,2-trifluor-1-(trifluormethyl)ethyl]-N′ N′-dialkylformamidine 1a, b reagieren mit Alkenen, Alkinen, CO2, COS und SO2 in Gegenwart einer Base zu bekannten und den neuen Heterocyclen 9a, b, 10, 11a, b und 12. Die beobachteten Regioselektivitäten und die ausgeprägte Lösungsmittelabhängigkeit der vorgestellten Reaktionen sind deutlich unterschiedlich zu solchen, in denen Nitril-ylide als reaktive Zwischenstufen angenommen werden. Die Synthesen erlauben einen leichten und schnellen Zugang zu den beschriebenen Verbindungen.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19871200618
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Reaktionen von Cyanformamidinen mit Hexafluoraceton (1986)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 119 (1986), S. 2127-2134 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Reaction of Cyanoformamidines with HexafluroacetoneHexafluoroacetone(HFA) reacts with N,N-dialkylcyanoformamidines in one step under mild conditions to form 4-(dialkylamino)-2,5-dihydro-5-imino-2,2-bis(trifluoromethyl)oxazoles 1a-d. 1a,b react further with HFA to yield the N′-(hydroxyhexafluoroisopropyl)-substituted derivatives 2a,b. Under the catalytic influence of copper powder in DMF 1a,b, rearrange to give 1,2-dihydro-2,2-bis(trifluromethyl)-5H-imidazol-5-ones 3a,b in good yields. The activation parameters of the hindered rotation of the C-4—N bond of 1a,c and 3a are reported.
    Notes: Hexafluoraceton (HFA) reagiert mit N,N-Dialkylcyanformamidinen in einem Reaktionsschritt unter milden Bedingungen zu 4-(Dialkylamino)-2,5-dihydro-5-imino-2,2-bis(trifluormethyl)oxazolen 1a-d. 1a,b könne mit weiterem HFA zu den N′-(hydroxyhexafluorisopropyl)substituierten Derivaten 2a,b umgesetzt werden. Unter der katalytischen Wirkung von Kupferpulver in DMF gelingt die Umlagerung von 1a,b in 1,2-Dihydro-2,2-bis(trifluormethyl)-5H-imidazol-5-one 3a,b in guten Ausbeuten. Von 1a,c und 3a wurden durch 1H-DNMR-Untersuchungen die Aktivierungsparameter der gehinderten Rotation um die C-4—N-Bindung bestimmt.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19861190707
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Synthese von Heterocyclen mit Phosphor - Phosphor-Bindung: Reaktionen von Phosphano-substituierten Cyan(triphenylphosphoranyliden)methanen mit Dichlororganylphosphanen (1989)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 122 (1989), S. 1411-1416 
    Details
    ISSN: 0009-2940
    Keywords: Phosphanophosphonium salts ; Phosphorus - phosphorus bonds ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis of Heterocycles with Phosphorus-Phosphorus Bond: Reactions of Phosphino-Substituted Cyano(triphenylphosphoranylidene)methanes with DichloroorganylphosphinesThe reaction of the phosphinyl-substituted cyano(triphenylphosphoranylidene)methanes 3 and 6 with dichloroorganylphosphines in the presence of sodium tetraphenylborate or aluminum trichloride leads to the new heterocycles 7a,b and 10a,c,d in high yields. The five-membered ring skeleton containing a phosphorus-phosphorus bond is, in contrast to known compounds with comparable features, folded. The formation of the heterocycles is best rationalized by a double rearrangement of one of the diisopropyl amino groups or the cyano(triphenylphosphoranylidene)-methyl group, the latter one migrating preferentially. Further treatment of 7a with a solution of HCl in ether yields the vicinal dichloro-λ3λ4-diphosphorus species 11.
    Notes: Die Reaktion der Phosphanyl-substituierten Cyan(triphenylphosphoranyliden)methane 3 und 6 mit Dichlororganylphosphanen und Natrium-tetraphenylborat oder Aluminium-trichlorid führt in hohen Ausbeuten zu den neuen Heterocyclen 7a,b und 10a,c,d mit Phosphor-Phosphor-Bindung. Diese besitzen ein gefaltetes Ringgerüst. Ihre Entstehung kann durch eine zweifache Umlagerung einer der Diisopropylamino-Gruppen oder der Cyan(triphenylphosphoranyliden)methyl-Gruppe erklärt werden. Eine weitere Funktionalisierung zu dem vicinalen Dichlor-λ3λ4-diphosphan-Derivat 11 ist möglich.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19891220805
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Versuche zur Synthese von Heterocyclen mit Phosphor - Arsen- und Arsen - Arsen-Bindung: Reaktionen von Arsan-substituierten Cyan(triphenylphosphoranyliden)methanen mit Dichloraminophosphanen und -arsanen (1989)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 122 (1989), S. 1417-1421 
    Details
    ISSN: 0009-2940
    Keywords: Phosphorus - arsenic bonds ; Arsenic - arsenic bonds ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis of Heterocycles with Phosphorus-Arsenic and Arsenic-Arsenic Bonds: Reactions of Arsano-Substituted Cyano-(triphenylphosphoranylidene)methanes with Dichloroaminophosphanes and -arsanesThe reaction of the arsano-substituted cyano(triphenylphosphoranylidene)methane 2 with the dichloro(diisopropylamino)phosphane (3) in the presence of sodium tetraphenylborate yields the five-membered heterocycle 5 containing a phosphorus-arsenic bond. 5 isomerizes in solution within 3 days to give the 1,2-azaphosphetene derivative 7. An 1,2-azaarsetene 8 is obtained in the reaction of 2 with the dichloroaminoarsane 4. The five-membered heterocycle 6 is postulated as an intermediate. The X-ray analysis of 8 reveals a weak intramolecular contact (2.72 Å) between a ring carbon atom and the exocyclic arsenic atom. This is responsible for an anchimeric acceleration of the metathetical reaction of 7 and 8 with methyl iodide leading to the iodoarsanes 9 and 10. The mechanism of the formation of 7 and 8 is discussed.
    Notes: Die Reaktion des Arsan-substituierten Cyan(triphenylphosphoranyliden)methans 2 mit Dichlor(diisopropylamino)phosphan (3) in Gegenwart von Natrium-tetraphenylborat führt zu dem fünfgliedrigen Heterocyclus 5 mit einer Phosphor-Arsen-Bindung. 5 isomerisiert in Lösung innerhalb von 3 Tagen zu dem 1,2-Azaphosphetenderivat 7. Die Reaktion von 2 mit dem Dichloraminoarsan 4 führt zu dem 1,2-Azaarsetenderivat 8. Ein Heterocyclus 6 mit Arsen-Arsen-Bindung wird als Zwischenprodukt postuliert. Die Einkristall-Röntgenstrukturanalyse von 8 weist auf einen schwachen intramolekularen Arsen-Kohlenstoff-Kontakt (2.72 Å) hin, der für die erhöhte Reaktivität von 7 und 8 zu den Iodarsanen 9 und 10 in der Metathesereaktion mit Methyliodid verantwortlich ist. Für die Bildung von 7 und 8 wird ein Reaktionsmechanismus vorgeschlagen.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19891220806
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...